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LED driving scheme using LM3405a and CSD17313Q2

azizjiwani
Prodigy 90 points
Other Parts Discussed in Thread: LM3405A, CSD17313Q2

Hi,

I am working on an LED driving scheme using LM3405a and CSD17313Q2. We have multiple RGBW LEDs on our board. We are using MSP430 controller to control the PWMs through the mosfets, this is done to get different light intensity and color combination. We have achieved the required performance using this scheme. But after sometime, one of the LEDs turn ON permanently. On debugging the board we found out that drain - source has shorted for that particular LED string because of which the LED remains ON continuously.

Our input voltage is 16.5V (Vin), maximum current passing through the LEDs is set to 930mA. LED driving scheme schematics is attached with the post. Can anyone please help us understand the reason behind this failure, we have noticed the same issue on multiple boards.

Thanks in advance for your help.

Regards,

Aziz Jiwani

LED driving scheme.pdf