LP5569: LP5569 LED issue

Yang Wu

Part Number: LP5569

Hi Team,

My customer has a problem that LEDs, in LED7 channel (Green LED), are still light ON even the current is set to 0mA. The rest channels behave normally if the current is set to 0mA.

Customer use external independent HV source to drive 6S3P RGB LEDs. The SCH is below, do you have any comments about the issue above? thanks!

over 6 years ago

0 Kenneth Du over 6 years ago

TI__Genius 14295 points

The sch is not very clear, but it seems the Red LEDs are controlled through NPN, while Green/Blue LEDs are connect to the HV through 4.7k or directly?

Actually the LEDx pin only support 6V max, so it may damage the LEDx if connecting to high voltage.

0 Yang Wu over 6 years ago in reply to Kenneth Du

TI__Expert 3320 points

Hi Kenneth,

Thanks for your reply. it helps.

Best regards,

Yang

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LP5569: LP5569 LED issue