Single-chip-driven three-function LED driving controller

Abstract

The utility model discloses a single-chip-driven three-function LED drive controller, which comprises a single-chip master control module, a daytime running function unit, a position function unit and a steering function unit, and is characterized in that the single-chip master control module is electrically connected with the daytime running lamp function unit, the steering lamp function unit and the position lamp function unit; according to the utility model, by adjusting the IFB pin for driving output and switching the output load at the same time, under the condition that different signals are input, the corresponding load and the corresponding working condition output current are switched, and three functions can be realized by using one chip, so that the manufacturing cost is greatly reduced, and the driving use efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile LED drive circuits, in particular to a single-chip driven three-function LED drive controller. Background Art

[0002] As people's living standards improve, the popularity of cars increases year by year, and people's requirements for automotive LED lights are getting higher and higher. Therefore, the daytime running, position and turn signals of cars begin to adopt more and more photoconductive methods to achieve them. However, the existing driving solutions on the market are generally mainly concentrated on a single chip using a constant current driving circuit to achieve driving. For example, steering, daytime running, and position each use a driving circuit, and at most two functions are concentrated for output. One driving circuit controls the daytime running and position lights. Therefore, when each function uses a separate driving circuit, the driving cost is high, the driving capacity is still abundant, and the design is complicated. Utility Model Content

[0003] The purpose of the utility model is to provide a single-chip driving three-function LED driving controller to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a single-chip driven three-function LED drive controller, including a single-chip main control module, a daytime running light function unit, a position function unit and a steering function unit, the single-chip main control module includes a U1 chip, and the U1 chip is electrically connected to the daytime running light function unit, the steering light function unit and the position light function unit.

[0005] Further, the U1 chip includes an IN pin 1, an IN pin 2, an NC pin 3, an EN / DIM pin 5, a VCC pin 7, and a / FIT pin 4;

[0006] The IN pin 2 is connected to the first end of the resistor R39, and the second end of the resistor R39 is connected to the EN / DIM pin;

[0007] IN pin 1 is connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to the circuit input voltage pins PIN1 and 2; the second end of the inductor L2 is connected in parallel to the first end of the capacitor CB3, and the second end of the capacitor CB3 is grounded; the first end of the inductor L2 is connected in parallel to the first end of the capacitor CB7, and the second end of the capacitor CB7 is grounded; the first end of the inductor L2 is connected in parallel to the first end of the capacitor CB1, and the second end of the capacitor CB1 is grounded;

[0008] IN pin 1 and IN pin 2 are connected in parallel through the supply voltage VCC;

[0009] The VCC pin 7 is connected to the first end of the capacitor CB15, and the second end of the capacitor CB15 is grounded;

[0010] / FIT pin 4 is connected to ground.

[0011] Further, the U1 chip includes a BST pin 10, a SW pin 9, a FB pin 6, an AGND pin 8, a PGND pin 11, a PGND pin 12, and a PGND pin 13;

[0012] Wherein the BST pin 10 is connected to the first end of the resistor R35, and the second end of the resistor R35 is connected to the first end of the capacitor CB44;

[0013] SW pin 9 is connected to the first end of the inductor L1, the first end of the inductor L1 is connected to the second end of the capacitor CB44, the second end of the inductor L1 is connected to the output voltage pins PIN13 and 14, the second end of the inductor L1 is connected in parallel to the capacitor CB4 and the first end of the capacitor CB11, the second end of the capacitor CB4 and the second end of the capacitor CB11 are connected in series to ground, and connected to pins PIN15 and 16;

[0014] FB pin 6 is connected to the positive electrode of diode D1, the negative electrode of diode D1 is grounded, and U1 chip is connected to the daytime running light function unit, the position light function unit and the turn signal function unit through the FB pin;

[0015] The AGND pin 8 , the PGND pin 11 , the PGND pin 12 , and the PGND pin 13 are connected to the ground in parallel.

[0016] Furthermore, the daytime running light functional unit includes a diode D4, a resistor R76, a resistor R10, a voltage stabilizing diode D7, a resistor R2, a resistor R7, and an NMOS tube Q2;

[0017] The anode of the diode D4 is connected to the DRL pin PIN4 of the daytime running light input power supply, the cathode of the diode D4 is connected to the first end of the resistor R76, the second end of the resistor R76 is connected to the first end of the resistor R10, the second end of the resistor R10 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the FB pin 6;

[0018] The second end of the resistor R76 is connected to the gate of the NMOS transistor Q2, and a voltage stabilizing diode D7 is connected in parallel between the gate of the NMOS transistor Q2 and the second end of the resistor R10, and the cathode of the voltage stabilizing diode D7 is connected to the gate of the NMOS transistor Q2, and the anode is connected to the second end of the resistor R10;

[0019] The source of the NMOS tube Q2 is connected to the first end of the resistor R7, the second end of the resistor R7 is grounded, and the drain of the NMOS tube Q2 is connected to the pin PIN12.

[0020] Further, the position light functional unit includes a diode D5, a resistor R9, a resistor R44, a voltage stabilizing diode D20, a resistor R1, a resistor R6, and an NMOS tube Q11;

[0021] The anode of the diode D5 is connected to the position light input power supply PL pin PIN5, the cathode of the diode D4 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the first end of the resistor R44, the second end of the resistor R44 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the FB pin 6;

[0022] The second end of the resistor R44 is connected to the gate of the NMOS transistor Q11, and a voltage stabilizing diode D20 is connected in parallel between the gate of the NMOS transistor Q11 and the second end of the resistor R44, wherein the cathode of the voltage stabilizing diode D20 is connected to the gate of the NMOS transistor Q11, and the anode is connected to the second end of the resistor R44;

[0023] The source of the NMOS tube Q11 is connected to the first end of the resistor R6, the second end of the resistor R6 is grounded, and the drain of the NMOS tube Q2 is connected to the pin PIN10.

[0024] Furthermore, the turn signal function unit includes a diode D6, a resistor R11, a resistor R12, a voltage stabilizing diode D8, a resistor R3, a resistor R8, and an NMOS tube Q4;

[0025] The anode of the diode D6 is connected to the position light input power supply TL pin PIN6, the cathode of the diode D5 is connected to the first end of the resistor R11, the second end of the resistor R11 is connected to the first end of the resistor R12, the second end of the resistor R12 is connected to the first end of the resistor R3, and the second end of the resistor R3 is connected to the FB pin 6;

[0026] The second end of the resistor R12 is connected to the gate of the NMOS tube Q4, and a voltage stabilizing diode D8 is connected in parallel between the gate of the NMOS tube Q4 and the second end of the resistor R12, and the cathode of the voltage stabilizing diode D8 is connected to the gate of the NMOS tube Q4, and the anode is connected to the second end of the resistor R12;

[0027] The source of the NMOS tube Q4 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded, and the drain of the NMOS tube Q4 is connected to the pin PIN8.

[0028] Compared with the prior art, the beneficial effect achieved by the utility model is as follows: the utility model adjusts the IFB pin of the drive output and switches the output load at the same time. When different signals are input, the corresponding load and the corresponding working condition output current are switched. Three functions can be realized with one chip, which greatly reduces the manufacturing cost and improves the drive efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0030] Figure 1This is a circuit diagram of a single-chip main control module in a single-chip driving three-function LED driving controller of the utility model;

[0031] Figure 2 This is a circuit diagram of a daytime running light function unit in a single-chip driving three-function LED driving controller of the utility model;

[0032] Figure 3 This is a circuit diagram of a position light function unit in a single-chip driving three-function LED driving controller of the utility model;

[0033] Figure 4 The utility model discloses a circuit diagram of a turn signal lamp function unit in a single-chip driven three-function LED driving controller. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] See also Figure 1-4 The utility model provides a technical solution: a single-chip driven three-function LED driving controller, including a single-chip main control module, a daytime running light function unit, a position function unit and a steering function unit. The single-chip main control module includes a U1 chip, and the U1 chip is electrically connected to the daytime running light function unit, the steering light function unit and the position light function unit.

[0036] U1 chip includes IN pin 1, IN pin 2, NC pin 3, EN / DIM pin 5, VCC pin 7, / FIT pin 4;

[0037] The IN pin 2 is connected to the first end of the resistor R39, and the second end of the resistor R39 is connected to the EN / DIM pin;

[0038] IN pin 1 is connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to the circuit input voltage pins PIN1 and 2; the second end of the inductor L2 is connected in parallel to the first end of the capacitor CB3, and the second end of the capacitor CB3 is grounded; the first end of the inductor L2 is connected in parallel to the first end of the capacitor CB7, and the second end of the capacitor CB7 is grounded; the first end of the inductor L2 is connected in parallel to the first end of the capacitor CB1, and the second end of the capacitor CB1 is grounded;

[0039] IN pin 1 and IN pin 2 are connected in parallel through the supply voltage VCC;

[0040] The VCC pin 7 is connected to the first end of the capacitor CB15, and the second end of the capacitor CB15 is grounded;

[0041] / FIT pin 4 is connected to ground.

[0042] Further, the U1 chip includes a BST pin 10, a SW pin 9, a FB pin 6, an AGND pin 8, a PGND pin 11, a PGND pin 12, and a PGND pin 13;

[0043] Wherein the BST pin 10 is connected to the first end of the resistor R35, and the second end of the resistor R35 is connected to the first end of the capacitor CB44;

[0044] SW pin 9 is connected to the first end of the inductor L1, the first end of the inductor L1 is connected to the second end of the capacitor CB44, the second end of the inductor L1 is connected to the output voltage pins PIN13 and 14, the second end of the inductor L1 is connected in parallel to the capacitor CB4 and the first end of the capacitor CB11, the second end of the capacitor CB4 and the second end of the capacitor CB11 are connected in series to ground, and connected to pins PIN15 and 16;

[0045] FB pin 6 is connected to the positive electrode of diode D1, the negative electrode of diode D1 is grounded, and U1 chip is connected to the daytime running light function unit, the position light function unit and the turn signal function unit through the FB pin;

[0046] The AGND pin 8 , the PGND pin 11 , the PGND pin 12 , and the PGND pin 13 are connected to the ground in parallel.

[0047] The daytime running light functional unit includes a diode D4, a resistor R76, a resistor R10, a voltage stabilizing diode D7, a resistor R2, a resistor R7, and an NMOS tube Q2;

[0048] The anode of the diode D4 is connected to the DRL pin PIN4 of the daytime running light input power supply, the cathode of the diode D4 is connected to the first end of the resistor R76, the second end of the resistor R76 is connected to the first end of the resistor R10, the second end of the resistor R10 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the FB pin 6;

[0049] The second end of the resistor R76 is connected to the gate of the NMOS transistor Q2, and a voltage stabilizing diode D7 is connected in parallel between the gate of the NMOS transistor Q2 and the second end of the resistor R10, and the cathode of the voltage stabilizing diode D7 is connected to the gate of the NMOS transistor Q2, and the anode is connected to the second end of the resistor R10;

[0050] The source of the NMOS tube Q2 is connected to the first end of the resistor R7, the second end of the resistor R7 is grounded, and the drain of the NMOS tube Q2 is connected to the pin PIN12.

[0051] The resistor R7 is used as a sampling signal of the daytime running lamp current to control the daytime running lamp current.

[0052] The position light functional unit includes a diode D5, a resistor R9, a resistor R44, a voltage stabilizing diode D20, a resistor R1, a resistor R6, and an NMOS tube Q11;

[0053] The anode of the diode D5 is connected to the position light input power supply PL pin PIN5, the cathode of the diode D4 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the first end of the resistor R44, the second end of the resistor R44 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the FB pin 6;

[0054] The second end of the resistor R44 is connected to the gate of the NMOS transistor Q11, and a voltage stabilizing diode D20 is connected in parallel between the gate of the NMOS transistor Q11 and the second end of the resistor R44, wherein the cathode of the voltage stabilizing diode D20 is connected to the gate of the NMOS transistor Q11, and the anode is connected to the second end of the resistor R44;

[0055] The source of the NMOS tube Q11 is connected to the first end of the resistor R6, the second end of the resistor R6 is grounded, and the drain of the NMOS tube Q2 is connected to the pin PIN10.

[0056] The resistor R6 is used as the position lamp current signal sampling to control the position lamp current.

[0057] The turn signal function unit includes a diode D6, a resistor R11, a resistor R12, a voltage stabilizing diode D8, a resistor R3, a resistor R8, and an NMOS tube Q4;

[0058] The anode of the diode D6 is connected to the position light input power supply TL pin PIN6, the cathode of the diode D5 is connected to the first end of the resistor R11, the second end of the resistor R11 is connected to the first end of the resistor R12, the second end of the resistor R12 is connected to the first end of the resistor R3, and the second end of the resistor R3 is connected to the FB pin 6;

[0059] The second end of the resistor R12 is connected to the gate of the NMOS tube Q4, and a voltage stabilizing diode D8 is connected in parallel between the gate of the NMOS tube Q4 and the second end of the resistor R12, and the cathode of the voltage stabilizing diode D8 is connected to the gate of the NMOS tube Q4, and the anode is connected to the second end of the resistor R12;

[0060] The source of the NMOS tube Q4 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded, and the drain of the NMOS tube Q4 is connected to the pin PIN8.

[0061] The resistor R8 is used to sample the turn signal current to control the turn signal current.

[0062] Embodiment 1: By adjusting the IFB pin of the drive output and switching the output load at the same time, when different signals are input, the corresponding load and the corresponding working condition output current are switched. When the DRL signal is input, the MOS tube Q2 is turned on, PIN12 is externally connected to the daytime running light load, and R7 is used as the daytime running light current signal sampling to control the daytime running light current. When the PL signal is input, the MOS tube Q11 is turned on, PIN10 is externally connected to the position light load, and R6 is used as the position light current signal sampling to control the position light current. When the TL signal is input, the MOS tube Q4 is turned on, PIN8 is externally connected to the turn signal load, and R8 is used as the turn signal current signal sampling to control the turn signal current.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A single-chip three-function LED driver controller, characterized by: It includes a single-chip main control module, a daytime running light function unit, a position function unit and a steering function unit. The single-chip main control module includes a U1 chip. The U1 chip is electrically connected to the daytime running light function unit, the steering light function unit and the position light function unit.

2. A single-chip three-function LED driver controller according to claim 1, characterized in that: The U1 chip includes an IN pin 1, an IN pin 2, an NC pin 3, an EN / DIM pin 5, a VCC pin 7, and a / FIT pin 4; The IN pin 2 is connected to the first end of the resistor R39, and the second end of the resistor R39 is connected to the EN / DIM pin; IN pin 1 is connected to the first end of the inductor L2, and the second end of the inductor L2 is connected to the circuit input voltage pins PIN1 and 2; the second end of the inductor L2 is connected in parallel to the first end of the capacitor CB3, and the second end of the capacitor CB3 is grounded; the first end of the inductor L2 is connected in parallel to the first end of the capacitor CB7, and the second end of the capacitor CB7 is grounded; the first end of the inductor L2 is connected in parallel to the first end of the capacitor CB1, and the second end of the capacitor CB1 is grounded; IN pin 1 and IN pin 2 are connected in parallel through the supply voltage VCC; The VCC pin 7 is connected to the first end of the capacitor CB15, and the second end of the capacitor CB15 is grounded; / FIT pin 4 is connected to ground.

3. The single-chip three-function LED driver controller according to claim 1, characterized in that: The U1 chip includes a BST pin 10, a SW pin 9, a FB pin 6, an AGND pin 8, a PGND pin 11, a PGND pin 12, and a PGND pin 13; Wherein the BST pin 10 is connected to the first end of the resistor R35, and the second end of the resistor R35 is connected to the first end of the capacitor CB44; SW pin 9 is connected to the first end of the inductor L1, the first end of the inductor L1 is connected to the second end of the capacitor CB44, the second end of the inductor L1 is connected to the output voltage pins PIN13 and 14, the second end of the inductor L1 is connected in parallel to the capacitor CB4 and the first end of the capacitor CB11, the second end of the capacitor CB4 and the second end of the capacitor CB11 are connected in series to ground, and connected to pins PIN15 and 16; FB pin 6 is connected to the positive electrode of diode D1, the negative electrode of diode D1 is grounded, and U1 chip is connected to the daytime running light function unit, the position light function unit and the turn signal function unit through the FB pin; The AGND pin 8 , the PGND pin 11 , the PGND pin 12 , and the PGND pin 13 are connected to the ground in parallel.

4. The single-chip three-function LED driver controller according to claim 3, characterized in that: The daytime running light functional unit includes a diode D4, a resistor R76, a resistor R10, a voltage stabilizing diode D7, a resistor R2, a resistor R7, and an NMOS tube Q2; The anode of the diode D4 is connected to the DRL pin PIN4 of the daytime running light input power supply, the cathode of the diode D4 is connected to the first end of the resistor R76, the second end of the resistor R76 is connected to the first end of the resistor R10, the second end of the resistor R10 is connected to the first end of the resistor R2, and the second end of the resistor R2 is connected to the FB pin 6; The second end of the resistor R76 is connected to the gate of the NMOS transistor Q2, and a voltage stabilizing diode D7 is connected in parallel between the gate of the NMOS transistor Q2 and the second end of the resistor R10, and the cathode of the voltage stabilizing diode D7 is connected to the gate of the NMOS transistor Q2, and the anode is connected to the second end of the resistor R10; The source of the NMOS tube Q2 is connected to the first end of the resistor R7, the second end of the resistor R7 is grounded, and the drain of the NMOS tube Q2 is connected to the pin PIN12.

5. The single-chip three-function LED driver controller according to claim 3, characterized in that: The position light functional unit includes a diode D5, a resistor R9, a resistor R44, a voltage stabilizing diode D20, a resistor R1, a resistor R6, and an NMOS tube Q11; The anode of the diode D5 is connected to the position light input power supply PL pin PIN5, the cathode of the diode D4 is connected to the first end of the resistor R9, the second end of the resistor R9 is connected to the first end of the resistor R44, the second end of the resistor R44 is connected to the first end of the resistor R1, and the second end of the resistor R1 is connected to the FB pin 6; The second end of the resistor R44 is connected to the gate of the NMOS transistor Q11, and a voltage stabilizing diode D20 is connected in parallel between the gate of the NMOS transistor Q11 and the second end of the resistor R44, wherein the cathode of the voltage stabilizing diode D20 is connected to the gate of the NMOS transistor Q11, and the anode is connected to the second end of the resistor R44; The source of the NMOS tube Q11 is connected to the first end of the resistor R6, the second end of the resistor R6 is grounded, and the drain of the NMOS tube Q2 is connected to the pin PIN10.

6. The single-chip three-function LED driver controller according to claim 3, characterized in that: The turn signal function unit includes a diode D6, a resistor R11, a resistor R12, a voltage stabilizing diode D8, a resistor R3, a resistor R8, and an NMOS tube Q4; The anode of the diode D6 is connected to the position light input power supply TL pin PIN6, the cathode of the diode D5 is connected to the first end of the resistor R11, the second end of the resistor R11 is connected to the first end of the resistor R12, the second end of the resistor R12 is connected to the first end of the resistor R3, and the second end of the resistor R3 is connected to the FB pin 6; The second end of the resistor R12 is connected to the gate of the NMOS tube Q4, and a voltage stabilizing diode D8 is connected in parallel between the gate of the NMOS tube Q4 and the second end of the resistor R12, and the cathode of the voltage stabilizing diode D8 is connected to the gate of the NMOS tube Q4, and the anode is connected to the second end of the resistor R12; The source of the NMOS tube Q4 is connected to the first end of the resistor R8, the second end of the resistor R8 is grounded, and the drain of the NMOS tube Q4 is connected to the pin PIN8.

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