TPS923655DRRREVM: Need to Drive LED 20 Nos with FV = 3V

Dear Sir,

Thanks for reaching out! Did you test with TPS923655DRRREVM board or your board? And what is the VIN, ILED and which dimming method you are using? Can you share with me the EVM board configuration?

Thank you!

BRs

Lucia

Hi Lucia Gao ,

I've tested it with TPS923655DRRREVM board. Vin was 12 V. As I mentioned ILED IS 1A. Currently dimming features are not used ADIM and PWM pins are Connected to VLDO. 

Hi

Will check with expert and update you soon...

Hi Sreejith P Kumar 

Thanks for your feedback! You mentioned that you adjusted the OVP resistor. May I have your latest schematic with evm board?

Thank you!

BRs

Lucia

The  change I made was to add a change resistor R17 to 15k and R7 to 0.2 Ohms(for 1A LED Current) .With that configuration maximum Output voltage was 84 V. Even without that modification when the input of EVM takes about 2.5A at 12V, The fault LED Blinks and LEDs also blinks randomly . OVP is below 1.14V . If i limit the current of the input to 1A . Switching takes place at output side but the current is very low. 

Hi Sreejith P Kumar 

Thanks for your feedback. I will look into it and get back to you early next week. Thank you!

BRs

Lucia