Through-type taillight solution based on Infineon PSoC and driver IC

With the popularity of LEDs in car lights , the application requirements of taillights have gradually expanded from simply replacing traditional bulbs to dynamic turn signals and taillight welcome functions. Position lights, brake lights , and turn signals also need to meet functional safety requirements. On the current road, from luxury cars to hot-selling cars and domestic cars, through-type taillights are becoming more and more common, and it seems to have become a trend. Based on these concepts, we share with you the through-type taillight solution based on Infineon  PSoC and driver IC. Compared with the previous taillight driver solution, it has fewer wire harnesses, simpler design, and more powerful functions.

The traditional taillight connection method has complex wiring harnesses. If more dynamic effects are required, the MCU+Driver method needs to be configured separately, which has complex software configuration and many wiring harnesses. For this reason, we have proposed a multi-channel LED driver solution with communication, as shown below:

This method realizes modularization and platformization. The light board and control board are separated independently. The control board can match different light board requirements by upgrading the software without changing the hardware:

► Scenario application diagram

► Product physical image

► Display board photos

► Solution Block Diagram

► Application Case 01

► Application Case 03

► Core technology advantages

1. A single chip has 16CH output channels, which greatly reduces the number of chips and makes the circuit design simple and reliable;

2. The chip has a built-in transceiver, so there is no need to place a transceiver on the light board;

3. Only 4 wires are needed to connect the light board and the control board, with less wiring harness;

4. Using physical layer CAN communication, the speed is up to 2Mbits/s, which can meet the various dynamic function requirements of tail lights and has strong anti-interference ability;

5. Complete diagnostic protection functions: (VFWD, SLS, Open, Short, NTC, PTC)

6. Meet the ASIL-B functional safety requirements. In case of communication failure, the OTP setting value can be called to control the corresponding channel;

7. The taillight control panel is standardized and platformized. For different models, only the light panel needs to be changed, and the control panel only needs to adjust the software.

► Solution Specifications

> Input voltage: 8-35V > Output voltage: 7.2V

LED Type:

1. Position lights: 56PCS, current: 5-50mA;

2. Brake light : 12pcs per side, current: 5-120mA;

3. Turn signal light: 12pcs per side, current: 5-120mA;

4. Rear fog lamp: 2S2P, current: 5-300mA;

5. Reversing light: 3S1P, current: 5-300mA;