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TPS92630-Q1: Schematic Issue

ZHOU XIAN PENG
Prodigy 10 points
Part Number: TPS92630-Q1

Dears,

Pls kindly help to check the schematic as My design doesn't agree with the specifications,thanks.

T13J固定侧尾灯20240326（修改版）.pdf

  • 0
    TI__Expert 8330 points

    Hi xian peng,

    • From the schematic, the output current is shared by two LED string, in this way, the LED open of one LED string can't be detected, the single-LED-short feature is the same. Do you need open-fault detection or single-LED-short detection? 
    • What is the purpose for RTL_FB and RTL_N related logic? this device has FAULT and FAULT_S pins used as the fault indicator; you can use it directly.
    • Since this device is a constant current device, the output current can be adjusted by REF pin. Why do you parallel output channels of two ICs and drive two LED strings in parallel? you can use one IC to drive one LED string, please let me know your consideration.

    BR,

    Hailee.

  • 0 in reply to Hailee Xu
    Prodigy 10 points

    Dears,

    Below isse kindly help to double check,thanks

    1, TPS92630 can three strings of 450MA current, the voltage is 8.4V-10.2V? Because the input is 9-16V, it needs to step up and down to 10.2V, 450MA can use a single three-lamp series.

    2, if only the detection of open circuit, one off, all off, how to connect?

  • 0 in reply to ZHOU XIAN PENG
    TI__Expert 8330 points

    Hi Xianpeng,

    1, TPS92630 can three strings of 450MA current, the voltage is 8.4V-10.2V? Because the input is 9-16V, it needs to step up and down to 10.2V, 450MA can use a single three-lamp series.

    -->Answer: if you mean the output voltage is 8.4V~10.2V, it depends on your LED loads. If the device can handle the heat, you don't need to reduce the input voltage, but if the power is huge, please add a dc-dc in front of the device to lower the input voltage.

    2, if only the detection of open circuit, one off, all off, how to connect?

    -->Answer: Do you need the fault signal connected to MCU? if not, you can leave the FAULT pin floating according to the below picture.

    BR,

    Hailee.