Load driving device
阅读说明:本技术 负载驱动装置 (Load driving device ) 是由 中山昌昭 克里希纳钱德兰·克里希南·奈尔 马修·乔治 于 2018-07-02 设计创作,主要内容包括:提供了一种负载驱动装置100,其包括:第一输入端子IN1,用于接受来自电源E的第一输入电流Iin1的输入;第二输入端子IN2,用于经由外部电阻器R接受来自电源E的第二输入电流Iin2的输入;输出端子OUT,用于将输出电流Iout输出到负载Z;电流分配单元110,用于以规定的分配比对第一输入电流Iin1和第二输入电流Iin2求和,并生成所述输出电流Iout;以及控制单元120,用于控制所述分配比。作为一个示例,控制单元120将适当地根据存在于第二输入端子IN2中的第一端子电压Vx与存在于输出端子OUT中的第二端子电压Vy之间的差(Vx?Vy)来控制所述分配比。(There is provided a load driving apparatus 100 including: a first input terminal IN1 for receiving an input of a first input current Iin1 from a power supply E; a second input terminal IN2 for receiving an input of a second input current Iin2 from the power supply E via the external resistor R; an output terminal OUT for outputting an output current Iout to a load Z; a current distribution unit 110 for summing the first input current Iin1 and the second input current Iin2 at a prescribed distribution ratio and generating the output current Iout; and a control unit 120 for controlling the distribution ratio. As one example, the control unit 120 will suitably control the distribution ratio according to the difference (Vx-Vy) between the first terminal voltage Vx present IN the second input terminal IN2 and the second terminal voltage Vy present IN the output terminal OUT.)
1. A load driving apparatus, comprising:
a first input terminal for receiving an input of a first input current from a power supply;
a second input terminal for accepting input of a second input current from the power supply via an external resistor;
an output terminal for outputting an output current to a load;
a current divider for generating the output current by summing the first input current and the second input current at a prescribed division ratio; and
a controller for controlling the distribution ratio.
2. The load driving device according to claim 1,
wherein the content of the first and second substances,
the current distributor includes a first transistor in a path in which the first input current flows, and
the controller is used for controlling the on-resistance value of the first transistor.
3. The load driving device according to claim 2,
wherein the content of the first and second substances,
the current distributor further includes a second transistor in a path in which the second input current flows, and
the controller is configured to differentially control on-resistance values of the first transistor and the second transistor.
4. The load driving device according to any one of claims 1 to 3,
wherein the content of the first and second substances,
the controller is configured to control the division ratio according to a difference between a first terminal voltage appearing at the second input terminal and a second terminal voltage appearing at the output terminal.
5. The load driving apparatus according to claim 4,
wherein the content of the first and second substances,
the controller includes:
an input detector for generating a first differential input voltage from the first terminal voltage,
an output detector for generating a second differential input voltage from the second terminal voltage, an
A differential amplifier for generating a control signal for the current distributor as a function of a difference between the first differential input voltage and the second differential input voltage.
6. The load driving apparatus according to claim 5,
wherein the content of the first and second substances,
the input detector is to generate the first differential input signal by subtracting a prescribed threshold voltage from the first terminal voltage.
7. The load driving apparatus according to claim 5 or 6,
wherein the content of the first and second substances,
the output detector is configured to output a highest value of a plurality of second terminal voltages as the second differential input signal.
8. The load driving apparatus according to claim 5 or 6,
wherein the content of the first and second substances,
the output detector is configured to output an average of a plurality of second terminal voltages as the second differential input signal.
9. The load driving device according to any one of claims 1 to 3,
wherein the content of the first and second substances,
the controller is configured to control the distribution ratio in accordance with a difference between a terminal voltage appearing at the second input terminal and a prescribed reference voltage.
10. The load driving device according to any one of claims 1 to 9, further comprising a current driver for performing constant current control of the output current.
11. The load driving device according to claim 10,
wherein, in a plan view of the semiconductor chip,
the current distributor is integrated on a first lateral side of the semiconductor chip, and
the current driver is integrated on a second side face of the semiconductor chip opposite to the first side face of the semiconductor chip.
12. The load driving device according to claim 11,
wherein the content of the first and second substances,
the current driver includes a plurality of constant current sources respectively connected between the current distributor and a plurality of output terminals.
13. The load driving apparatus according to claim 12,
wherein, in a plan view of the semiconductor chip,
the plurality of constant current sources are arranged in a direction along the second side of the semiconductor chip.
14. The load driving apparatus according to claim 13,
wherein, in a plan view of the semiconductor chip,
the current distributor is integrated between a position adjacent to such one of the plurality of constant current sources that is closest to a third side of the semiconductor chip and a position adjacent to such one of the plurality of constant current sources that is farthest from the third side of the semiconductor chip.
15. The load driving device according to any one of claims 1 to 14,
wherein the content of the first and second substances,
the terminal connected to the power source and the terminal adjacent to the terminal have a withstand voltage sufficient to withstand the connection with the power source.
16. The load driving device according to claim 2,
wherein the content of the first and second substances,
the first transistor includes:
a source region of the semiconductor substrate,
a source pad disposed proximate to the source region and wire bonded to the first input terminal,
a drain region, and
a drain pad disposed proximate the drain region and wire bonded to the second input terminal.
17. The load driving device according to any one of claims 1 to 16,
wherein the content of the first and second substances,
the first input terminal and the second input terminal are arranged adjacent to each other.
18. The load driving device according to any one of claims 1 to 17,
wherein the content of the first and second substances,
an external terminal, which can be designed to have a high withstand voltage more easily than other external terminals, is arranged adjacent to the first input terminal or the second input terminal.
19. The load driving device according to any one of claims 1 to 18,
wherein the content of the first and second substances,
the first input terminal accepts the input of the first input current directly from the power source.
20. The load driving device according to any one of claims 1 to 19,
wherein the content of the first and second substances,
the controller is configured to dynamically control the distribution ratio.
21. The load driving device according to any one of claims 1 to 20,
wherein the content of the first and second substances,
the load driving apparatus is integrated in a semiconductor device.
22. The load driving device according to claim 2,
wherein the content of the first and second substances,
the controller is configured to dynamically control the on-resistance value of the first transistor.
23. The load driving apparatus according to claim 3,
wherein the content of the first and second substances,
the controller is configured to dynamically differentially control an on-resistance value of each of the first and second transistors.
24. The load driving apparatus according to claim 4,
wherein the content of the first and second substances,
the controller is to dynamically control the allocation ratio according to the difference between the first terminal voltage and the second terminal voltage.
25. An electrical appliance, comprising:
the load driving apparatus according to any one of claims 1 to 24;
an external resistor connected between a first input terminal and a second input terminal of the load driving device; and
a load connected to an output terminal of the load driving apparatus.
26. A lamp module, comprising:
the load driving apparatus according to any one of claims 1 to 24;
an external resistor connected between a first input terminal and a second input terminal of the load driving device; and
a light source connected as a load to an output terminal of the load driving apparatus.
27. A vehicle, comprising:
the lamp module of claim 26; and
a battery as a power source for the light module.
28. The vehicle according to claim 27, wherein the vehicle is,
wherein the content of the first and second substances,
the lamp module is a headlight module, a tail lamp module, or a turn lamp module.
Technical Field
The invention disclosed herein relates to a load driving apparatus.
Background
Fig. 17 is a diagram showing a conventional example of a semiconductor integrated circuit device. The load driving device X of this conventional example is a semiconductor integrated circuit device (referred to as a driver IC) that receives an input of an input voltage Vin from a power supply E and outputs an output voltage Vout and an output current Iout to a load Z.
An example of the conventional technology related to the above is disclosed in
Disclosure of Invention
Problems to be solved by the invention
Fig. 18 is a diagram showing the output behavior of the load driving device X, showing the relationship between the input voltage Vin and the output voltage Vout, the relationship between the input voltage Vin and the output current Iout, and the relationship between the input voltage Vin and the power consumption Pc in this order from top to bottom.
As shown in the figure, the load driving device X performs output feedback control to maintain the output current Iout at a constant value without depending on the input voltage Vin. In the output feedback control, the output voltage Vout is determined according to the characteristics of the load Z (for example, according to its forward voltage drop if the load Z is an LED (light emitting diode)). The power consumption Pc is obtained as the product of the difference between the input voltage and the output voltage (Vin-Vout) and the output current Iout.
Therefore, in the load driving device X, as the input voltage Vin increases, the power consumption Pc increases, and the heat generation amount also becomes larger. Therefore, in order to sufficiently dissipate heat from the load driving device X, the printed circuit board on which the load driving device X is mounted needs to have a large area, which makes it difficult to mount the load driving device X in a compact module.
In view of the above-described problems found by the inventors of the present application, it is an object of the present invention disclosed herein to provide a load driving apparatus capable of distributing power consumption therein.
Means for solving the problems
The load driving apparatus disclosed herein includes: a first input terminal for receiving an input of a first input current from a power supply; a second input terminal for accepting input of a second input current from the power supply via an external resistor; an output terminal for outputting an output current to a load; a current divider for generating the output current by summing the first input current and the second input current at a prescribed division ratio; and a controller for controlling the distribution ratio (first configuration).
Preferably, in the load driving device having the first configuration described above, the current distributor includes a first transistor in a path in which the first input current flows, and the controller is configured to control an on-resistance value of the first transistor (second configuration).
Preferably, in the load driving device having the second configuration described above, the current distributor further includes a second transistor in a path in which the second input current flows, and the controller is configured to differentially control on-resistance values of the first transistor and the second transistor (third configuration).
Preferably, in the load driving device having any one of the first to third configurations described above, the controller is configured to control the division ratio in accordance with a difference between a first terminal voltage appearing at the second input terminal and a second terminal voltage appearing at the output terminal (a fourth configuration).
Preferably, in the load driving device having the fourth configuration described above, the controller includes: an input detector for generating a first differential input voltage from the first terminal voltage; an output detector for generating a second differential input voltage from the second terminal voltage; and a differential amplifier for generating a control signal for the current distributor from a difference between the first differential input voltage and the second differential input voltage (fifth configuration).
Preferably, in the load driving device having the fifth configuration, the input detector is configured to generate a first differential input signal by subtracting a prescribed threshold voltage from the first terminal voltage (sixth configuration).
Preferably, in the load driving device having the fifth or sixth configuration described above, the output detector is configured to output a highest value of the plurality of second terminal voltages as the second differential input signal (seventh configuration).
Preferably, in the load driving device having the fifth or sixth configuration described above, the output detector is configured to output an average value of a plurality of second terminal voltages as the second differential input signal (eighth configuration).
Preferably, in the load driving device having any one of the first to third configurations described above, the controller is configured to control the division ratio in accordance with a difference between a terminal voltage appearing at the second input terminal and a prescribed reference voltage (ninth configuration).
Preferably, the load driving device having any one of the first to ninth configurations described above further includes a current driver for performing constant current control of the output current (tenth configuration).
Preferably, in the load driving device having the tenth configuration described above, the current distributor is integrated on a first side of the semiconductor chip, and the current driver is integrated on a second side of the semiconductor chip opposite to the first side of the semiconductor chip (eleventh configuration).
Preferably, in the load driving device having the eleventh configuration described above, the current driver includes a plurality of constant current sources connected between the current distributor and a plurality of output terminals, respectively (twelfth configuration).
Preferably, in the load driving device having the twelfth configuration described above, the plurality of constant current sources are arranged in a direction along the second side of the semiconductor chip in a plan view of the semiconductor chip (thirteenth configuration).
Preferably, in the load driving device having the thirteenth configuration described above, the current distributor is integrated between a position adjacent to such one of the plurality of constant current sources that is closest to a third side of the semiconductor chip and a position adjacent to such one of the plurality of constant current sources that is farthest from the third side of the semiconductor chip in a plan view of the semiconductor chip (fourteenth configuration).
Preferably, in the load driving device having any one of the first to fourteenth configurations described above, the terminal connected to the power supply and the terminal adjacent to the terminal have a withstand voltage sufficient to withstand the connection with the power supply (fifteenth configuration).
Preferably, in the load driving device having the second configuration described above, the first transistor includes a source region, a source pad provided adjacent to the source region and wire-bonded to the first input terminal, a drain region, and a drain pad provided adjacent to the drain region and wire-bonded to the second input terminal (sixteenth configuration).
Preferably, in the load driving device having any one of the first to sixteenth configurations described above, the first input terminal and the second input terminal are arranged adjacent to each other (a seventeenth configuration).
Preferably, in the load driving device having any one of the first to seventeenth configurations described above, an external terminal that can be designed to have a high withstand voltage more easily than other external terminals is arranged adjacent to the first input terminal or the second input terminal (eighteenth configuration).
Preferably, in the load driving device having any one of the first to eighteenth configurations described above, the first input terminal accepts input of the first input current directly from the power supply (nineteenth configuration).
Preferably, in the load driving device having any one of the first to nineteenth configurations described above, the controller is configured to dynamically control the distribution ratio (twentieth configuration).
Preferably, in the load driving apparatus having any one of the first to twentieth configurations described above, the load driving apparatus is integrated in a semiconductor device (a twenty-first configuration).
Preferably, in the load driving device having the second configuration described above, the controller is configured to dynamically control the on-resistance value of the first transistor (a twenty-second configuration).
Preferably, in the load driving device having the third configuration described above, the controller is configured to dynamically differentially control the on-resistance value of each of the first transistor and the second transistor (a twenty-third configuration).
Preferably, in the load driving apparatus having the fourth configuration described above, the controller is configured to dynamically control the division ratio in accordance with the difference between the first terminal voltage and the second terminal voltage (a twenty-fourth configuration).
The electric appliance disclosed herein includes the load driving device having any one of the first to twenty-fourth configurations described above, an external resistor connected between the first input terminal and the second input terminal of the load driving device, and a load connected to the output terminal of the load driving device (a twenty-fifth configuration).
The lamp module disclosed herein includes the load driving device having any one of the first to twenty-fourth configurations, an external resistor connected between a first input terminal and a second input terminal of the load driving device, and a light source connected as a load to an output terminal of the load driving device (a twenty-sixth configuration).
The vehicle disclosed herein includes a lamp module having the twenty-sixth configuration described above and a battery as a power source of the lamp module (twenty-seventh configuration).
Preferably, in the vehicle having the twenty-seventh configuration described above, the lamp module is a headlight module, a tail lamp module, or a turn lamp module (twenty-eighth configuration).
ADVANTAGEOUS EFFECTS OF INVENTION
According to the invention disclosed herein, a load driving apparatus capable of distributing power consumption therein can be provided.
Drawings
Fig. 1 is a diagram showing an overall configuration of an electric appliance including a load driving apparatus;
fig. 2 is a diagram showing a first embodiment of an LED driver IC;
fig. 3 is a diagram showing an example of power consumption allocation control performed in the first embodiment;
fig. 4 is a diagram showing a second embodiment of an LED driver IC;
fig. 5 is a diagram showing an example of power consumption allocation control performed in the second embodiment;
fig. 6 is a diagram showing a third embodiment of an LED driver IC;
fig. 7 is a diagram showing an example of power consumption allocation control performed in the third embodiment;
fig. 8A is a diagram (first example) showing the arrangement of terminals (16 pins) in an LED driver IC;
fig. 8B is a diagram (second example) showing the arrangement of terminals (16 pins) in the LED driver IC;
fig. 8C is a diagram showing the arrangement of terminals (16 pins) in the LED driver IC (third example);
fig. 8D is a diagram showing the arrangement of terminals (16 pins) in the LED driver IC (fourth example);
fig. 9 is a diagram showing a first layout in the semiconductor chip;
fig. 10 is a diagram showing a second layout in the semiconductor chip;
fig. 11 is a diagram showing a third layout in the semiconductor chip;
fig. 12 is a diagram showing a fourth layout in the semiconductor chip;
fig. 13 is a diagram showing an arrangement of pads in the current distributor;
fig. 14 is a diagram showing the arrangement of terminals (7 pins) in the LED driver IC;
FIG. 15 is an exterior view of the motorcycle;
FIG. 16 is an exterior view of a four-wheeled vehicle;
fig. 17 is a diagram showing a conventional example of a load driving apparatus; and
fig. 18 is a diagram showing an example of output behavior observed in the conventional example.
Detailed Description
< Electrical appliance >
Fig. 1 is a diagram showing an overall configuration of an electric appliance including a load driving device. The
The
A first end of the external resistor R is connected to a positive terminal of the power supply E (i.e., an input voltage Vin application terminal) and a first input terminal IN1 of the
A first terminal of the load Z is connected to an output terminal OUT (an output voltage Vout application terminal) of the
< load drive device >
Still referring to fig. 1, the internal configuration of the
The first input terminal IN1 is an external terminal for receiving an input of a first input current Iin1 directly from the power supply E.
The second input terminal IN2 is an external terminal for receiving an input of a second input current Iin2 from the power supply E via the external resistor R.
The output terminal OUT is an external terminal for outputting an output voltage Vout and an output current Iout to the load Z.
The
The
The
Therefore, the
By adopting this configuration, the power consumption inside the device can be kept at or below the predetermined upper limit value at all times, and therefore the heat generation of the
Further, the input dynamic range of the load driving device 100 (the range of the input voltage Vin that can be fed to the load driving device 100) is also expanded, and therefore, for example, a battery that supplies an unstable input voltage Vin may be used as the power source E.
Further, since excessive power is not applied in the
The external resistor R is a discrete component and is more heat-resistant than the
In the following, a more detailed description will be given in connection with various embodiments, which relate to an example applied to a multi-channel LED driver IC.
< first embodiment >
Fig. 2 is a diagram showing a first embodiment of an LED driver IC. In the present embodiment, the above-described
Therefore, in the following description, the
The
First, the
Now, a detailed description will be given of the interconnections between them. The source and back gate of the
The gate of the
On the other hand, the gate of the
Between the gate and source of each of the
Next, the
The
The
Preferably, for example, the
Alternatively, for example, the
The
Now, a detailed description will be given of the operation of the
On the other hand, when Vx '-Vy' >0 (i.e., Vx-Vy > Vth) is held, the first control signal Sc1 held at the low level rises from the low level, the second control signal Sc2 held at the high level falls from the high level, and therefore the on-resistance value of the
In this way, in the
Next, the
Fig. 3 is a diagram showing an example of power consumption allocation control in the
In the first voltage range (0. ltoreq. Vin < V11), as the input voltage Vin rises, both the first terminal voltage Vx and the second terminal voltage Vy rise. However, in the first voltage range, the second terminal voltage Vy does not exceed the forward voltage drop of the LED light source Z (more precisely, the lowest value of the forward voltage drops of the LED strings Z1 to Z4), and the output current Iout does not flow. Therefore, both the first input current Iin1 and the second input current Iin2 are kept at zero value, and the internal power consumption Pc1 and the external power consumption Pc2 are also kept at zero value.
In the second voltage (V11 ≦ Vin < V12), the second terminal voltage Vy becomes higher than the forward voltage drop of the LED light source Z, and the output current Iout starts to increase. However, in the second voltage range, Vx-Vy < Vth remains unchanged, so the power consumption allocation function does not operate, and the second input current Iin2 does not flow. Therefore, the output current Iout is generated entirely by the first
In the third voltage range (V12 ≦ Vin < V13), the output current Iout reaches its target value (e.g., 450mA) and the second terminal voltage Vy stops rising, so as the input voltage Vin rises, the difference between the first terminal voltage Vx and the second terminal voltage Vy starts to increase. However, in the third voltage range, Vx-Vy < Vth still remains, and therefore, as in the above-described second voltage range, the power consumption allocation control does not operate, and the second input current Iin2 does not flow. Therefore, the internal power consumption Pc1 further increases, but on the other hand, the external power consumption Pc2 remains at a zero value.
In the fourth voltage range (V13 ≦ Vin < V14), Vx-Vy > Vth remains unchanged, and the power consumption allocation function starts to operate. More specifically, in the fourth voltage range, the
By providing such a power consumption distribution function, a loss of a part of the surplus power supplied from the battery E can be intentionally generated as the
In particular, in the
As shown in the figure, the characteristics of the output current Iout generated by summing the first input current Iin1 and the second input current Iin2 are the same as those of the conventional example (fig. 18). Therefore, when the power consumption allocation function is introduced, the
< second embodiment >
Fig. 4 is a diagram showing a second embodiment of the LED driver IC. Although this embodiment is based on the first embodiment (fig. 2) described above, in the
Fig. 5 is a diagram showing an example of power consumption distribution control performed in the
The basic operation of this embodiment is performed in the same manner as described above, and can be understood simply by reading the voltage values V11 to V14 in fig. 3 as the voltage values V21 to V24 in this figure, respectively.
Since the
However, by setting the resistance value of the external resistor R to a sufficiently large value (about 10Q) with respect to the on-resistance value (about 0.5Q) of the
< third embodiment >
Fig. 6 is a diagram showing a third embodiment of the LED driver IC. Although this embodiment is based on the first embodiment (fig. 2) described above, in the
Here, the reference voltage Vref may be set to a voltage value higher than a desired value of the second terminal voltage Vy by the threshold voltage Vth described above.
Fig. 7 is a diagram showing an example of power consumption distribution control performed in the
The basic operation of this embodiment is performed in the same manner as described above, and can be understood simply by reading the voltage values V11 to V14 in fig. 3 as the voltage values V31 to V34 in this figure, respectively.
However, in the
Further, an example of processing in this embodiment is based on the first embodiment (fig. 2), but it may be based on the second embodiment (fig. 4) instead. Specifically, in the
< terminal arrangement (16 pins) >
Fig. 8A to 8D are diagrams showing the arrangement of terminals (16 pins) in the
The VINRES terminal (pin 1) is a distribution resistor connection terminal, and corresponds to the above-described second input terminal IN 2. The VIN terminal (pin 2) is a source voltage input terminal, and corresponds to the above-described first input terminal IN 1. The PBUS terminal (pin 3) is an abnormal state flag output/output current off control input terminal. The CRT terminal (pin 4) and the DISC terminal (pin 5) are CR timer setting terminals. The MSET1 terminal (pin 6) and the MSET2 terminal (pin 11) are mode setting terminals. The SET1 terminal (pin 7), the SET2 terminal (pin 8), the SET3 terminal (pin 10), and the SET4 terminal (pin 9) are four-channel output current setting terminals. The GND terminal (pin 12) is a ground terminal. The OUT1 terminal (pin 16), the OUT2 terminal (pin 15), the OUT3 terminal (pin 14), and the OUT4 terminal (pin 13) are four-channel current output terminals. The EXP-PAD terminal indicated by a dotted line serves as a heat PAD.
Preferably, as shown in fig. 8A to 8D, the VINRES terminal and the VIN terminal are arranged adjacent to each other. However, as can be understood from a comparison between fig. 8A and 8B (or 8D), the two terminals may be arranged in the reverse order. Also, preferably, as shown in fig. 8A to 8D, the CRT terminal and the DISC terminal are arranged adjacent to each other. However, as can be understood from a comparison between fig. 8A and 8C (or 8D), the two terminals may be arranged in the reverse order.
The above four external terminals (VINRES, VIN, CRT, and DISC) are all connected to a power supply E (battery). Therefore, it is desirable to design these four external terminals (VINRES, VIN, CRT, and DISC) to have a higher withstand voltage than the other external terminals so that they can withstand connection with the power supply E.
On the other hand, external terminals other than the above-described 4 external terminals (PBUS, GND, MSET1 and MSET2, SET1 to SET4, and OUT1 to OUT4) are not connected to the power supply E. Therefore, it is basically sufficient that these external terminals (PBUS, GND, MSET1 and MSET2, SET1 to SE4, and OUT1 to OUT4) are designed to have lower withstand voltage than the other external terminals.
However, for the external terminals (PBUS, MSET1) adjacent to the above-described four external terminals (VINRES, VIN, CRT, and DISC), as a measure for preventing short-circuiting between the adjacent terminals, it is desirable to design the external terminals (PBUS, MSET1) to have a higher withstand voltage than the other external terminals.
That is, it is desirable to select an external terminal (e.g., PBUS, MSET1, or MSET2) that is relatively easy to design to have a high withstand voltage as an external terminal arranged adjacent to the above-described four external terminals (VINRES, VIN, CRT, and DISC).
< chip layout >
Fig. 9 to 12 are diagrams showing examples of layouts in the semiconductor chip sealed in the
In the following description about the four sides constituting the outer edge of the
In this layout, the
On the other hand, in the present layout, the
That is, the
Employing such a chip layout makes it possible to group power input side pins (e.g., pins 1, 2, 4, and 5 in fig. 8) among a plurality of pins in the
Further, as also shown in fig. 2 referred to earlier, for example, the
Here, it is preferable that, in a plan view of the
Specifically, according to the layouts shown in fig. 10 and 12, as compared with the layouts shown in fig. 9 and 11, for the resistance component of the conductor L1 laid out from the
For example, with the layout shown in fig. 9, the conductor resistance to the constant
In contrast, with the layouts shown in fig. 10 and 12, the conductor length from the
The
< arrangement of pads >
Fig. 13 is a diagram showing the arrangement of pads in the current distributor 110(═ transistor 111) shown in fig. 4. As shown IN the figure, the
Therefore, for the source pad P11 and the drain pad P12 of the
< terminal arrangement (7 pins) >
Fig. 14 is a diagram showing the arrangement of terminals (7 pins) in the
Here, the SET1 terminal (pin 1) and the SET2 terminal (pin 2) are output current setting terminals for two channels. The OUT1 terminal (pin 3) and the OUT2 terminal (pin 4) are two-channel current output terminals. The GND terminal (pin 5) is a ground terminal. The IN1 terminal (pin 6) is a source voltage input terminal, and corresponds to the above-described first input terminal IN 1. The IN2 terminal (pin 7) is a distribution resistor connection terminal, and corresponds to the above-described second input terminal IN 2.
Preferably, the IN1 terminal and the IN2 terminal are arranged adjacent to each other. Here, the two terminals may be arranged in reverse order. Here, it is desirable to design the two external terminals (IN1, IN2) to have a high withstand voltage so that it can withstand connection with the power supply E.
On the other hand, it is basically sufficient that the external terminals (SET1, SET2, OUT1, OUT2, GND) other than the above two terminals are designed to have a low withstand voltage. However, for the external terminals (GND) adjacent to the above-described two external terminals (IN1, IN2), as a measure for preventing short-circuiting between the adjacent terminals, it is desirable to design the external terminals (GND) to have a high withstand voltage.
That is, as the external terminals provided adjacent to the two external terminals (IN1, IN2), it is desirable to select an external terminal (e.g., GND) that is relatively easy to design and high IN withstand pressure.
< vehicle (motorcycle, four-wheeled automobile) >
Fig. 15 is an external view of the motorcycle. The motorcycle a shown in the figure is an example of a so-called medium-sized motorcycle (corresponding to a general motorcycle defined as a motorcycle class belonging to which an engine displacement exceeds 50cc but does not exceed 400cc in the japanese road traffic law). The motorcycle a has LED lamp modules a1 to A3 (more specifically, an LED headlight module a1, an LED tail lamp module a2, and an LED turn lamp module A3) and a battery a4 as a power source of these lamp modules.
Fig. 16 is an external view of a four-wheeled automobile. The four-wheeled automobile B shown in the figure has LED lamp modules B1 to B3 (more specifically, an LED headlamp module B1, an LED tail lamp module B2, and an LED turn lamp module B3) and a battery a4 as a power source for these lamp modules.
For convenience of explanation, the installation positions of the LED lamp modules a1 to A3 and B1 to B3 and the batteries a4 and B4 in fig. 15 and 16 may be different from reality.
As has been discussed above, since the LED lamp module 1 (see fig. 2, 4, and 6) provided with the
< additional description A >
Additional description will be given in conjunction with fig. 8A to 8D referred to previously. As regards the first terminal for receiving the first current from the power supply and the second terminal for receiving the second current from the power supply via the external resistor, these terminals are preferably both arranged on the first side of the package.
Here, preferably, the first terminal is disposed at one end of the first side, and the second terminal is disposed adjacent to the first terminal.
Alternatively, the second terminal may be disposed at one end of the first side, and the first terminal may be disposed adjacent to the second terminal.
On the first side, in addition to the first terminal and the second terminal, a third terminal connected to a power supply may be provided.
On the first side, a fourth terminal not connected to a power supply may be provided in addition to the first, second and third terminals.
Further, it is preferable that a fifth terminal for outputting a current to a load is provided on a second side of the four side faces of the package, the second side being a different side from the first side.
Here, preferably, the second side is a side opposite to the first side.
As the fifth terminal, a plurality of fifth terminals may be provided.
Preferably, the plurality of fifth terminals are disposed adjacent to each other.
Preferably, the fifth terminal is disposed at one end of the second side.
Further, it is preferable that a sixth terminal for connecting a ground terminal is provided adjacent to the fifth terminal.
Further, it is preferable that a seventh terminal for heat dissipation is provided on the rear surface of the package.
< additional description B >
Next, additional explanation will be given in conjunction with fig. 9 to 13 referred to previously. Preferably, the current distributor and the current driver are arranged separately from one another, such that one is arranged on a first lateral side of the semiconductor chip and the other is arranged on a second lateral side of the semiconductor chip.
Here, it is preferable that the plurality of constant current sources included in the current driver are arranged in a direction along the second side of the semiconductor chip in a plan view of the semiconductor chip.
Further, it is preferable that the current distributor is integrated between a position adjacent to such one of the plurality of constant current sources that is closest to the third side of the semiconductor chip and a position adjacent to such one of the plurality of constant current sources that is farthest from the third side in a plan view of the semiconductor chip.
Further, preferably, in a plan view of the semiconductor chip, another circuit part including a reference power supply for generating an internal reference voltage, a CR timer for PWM (pulse width modulation) controlling an output current fed to a load, a protection bus controller for exchanging a fault signal with the outside of the device, various protection circuits, and the like is integrated in a region adjacent to both the current distributor and the current driver.
Further, it is preferable that the current distributor is integrated at a position between the plurality of portions into which the other circuit portion is divided in a plan view of the semiconductor chip.
Further, it is preferable that at least a part of the other circuit portion is integrated at a position between the plurality of constant current sources in a plan view of the semiconductor chip.
Preferably, the current distributor, the current driver, and the other circuit portion are arranged on a third side face, and the controller for controlling the operation of the semiconductor chip as a whole and the current setter for setting the current value of the output current fed to the load are arranged on a fourth side face, the third and fourth sides being opposed to each other.
Here, it is preferable that the current setter is located closer to the fourth side than the controller.
As for the transistor constituting the current distributor, it is preferable that a first pad connected to the source region is disposed on the first side face, and a pad connected to the drain region is disposed on the third side face.
Preferably, a first wire via which the first pad and the first terminal are connected to each other is shorter than a second wire via which the second pad and the second terminal are connected to each other.
Preferably, in a plan view of the semiconductor chip, the first wire extends from the first pad in a direction parallel to the third side to be connected with the first terminal, and the second wire extends from the second pad in a direction parallel to the third side to be connected with the second terminal.
< additional description C >
Next, additional explanation will be given in conjunction with fig. 14 referred to previously. Preferably, all terminals including a first terminal for receiving a first current from a power supply and a second terminal for receiving a second current from the power supply via an external resistor are provided on one side of the package.
Here, preferably, the second terminal is disposed at one end of one side of the package, and the first terminal is disposed adjacent to the second terminal.
Alternatively, the first terminal may be disposed at one end of one side of the package, and the second terminal may be disposed adjacent to the first terminal.
Preferably, a third terminal for connecting a ground terminal is provided adjacent to the first or second terminal.
Preferably, the third terminal is disposed between the first or second terminal and the fourth terminal for outputting a current to the load.
As the fourth terminal, a plurality of fourth terminals may be provided.
Preferably, the plurality of fourth terminals are disposed adjacent to each other.
Preferably, at the other end of the one side of the package, a fifth terminal not connected to a power supply is provided.
< other modified example >
The embodiments discussed above have dealt with examples of applying the invention to a multi-channel LED driver IC. However, the application object of the present invention is not limited to a multi-channel LED driver IC at all, and the present invention is generally widely applicable to a load driving apparatus requiring a limitation of power consumption.
The above-described embodiments have dealt with the configuration using LEDs as light emitting elements by way of example, but, for example, organic EL (electroluminescence) elements may also be used as light emitting elements.
Therefore, in addition to the above-described embodiments, various modifications may be added to various technical features disclosed herein without departing from the spirit of technical innovation. In other words, it should be understood that the above-described embodiments are examples, not limitations, in all aspects; the technical scope of the present invention is not limited to the above description of the embodiments; and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.
Industrial applicability of the invention
The invention disclosed herein can be used, for example, in a multi-channel LED driver IC included in an LED lamp module for a vehicle (motorcycle, four-wheel automobile, etc.).
Description of the symbols
1 electric appliance (LED lamp module)
100 load driving device (multichannel LED drive IC)
110 current distributor
111. 112P channel MOS field effect transistor
120 controller
121 input detector
121a resistor
121b Current Source
122 output detector
123 differential amplifier
130 current driver
131 to 134 constant current source
140 current setting device
150 other circuit parts
200 semiconductor chip
201 first side
202 second side
203 third side
204 fourth side
Motorcycle A (vehicle)
B four-wheel automobile (vehicle)
A1, B1 LED headlight module
A2, B2 LED tail lamp module
A3, B3 LED turn signal lamp module
A4, B4 battery
D drain region
E power supply (Battery)
IN1, IN2 input terminal
L1 conductor (Current Path)
OUT, OUT 1-
P11 pad (Source pad)
P12 pad (Drain pad)
P31, P32, P33, P34 pads
R external resistor
S source region
W1, W2 lead wire
Z load (LED light source)
Z1-Z4 LED string
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