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TPS92515HV: LED flickering issue below 3% dimming

rafy ks
Prodigy 60 points
Part Number: TPS92515HV

We are working on an LED dimmer circuit which supports DALI2.0 Interface. We already received the hardware and working on software only. LED driver circuit is based TPS92515HV and below is the circuitry


But the issue is LED flickers when dimming below 3%. There is no Voltage-Current stability below 3%. Is it a problem with analog dimming. Hardware designers went to analog dimming decision after experimenting on both analog and PWM dimming and found PWM more prone to flickering. I'm not sure whether they have tried shunt FET dimming. What is the actual reason behind this issue and how to get rid of this?

  • 0
    TI__Mastermind 25500 points

    Hello Rafy,

    I responded in the other thread. But my guess is that the output voltage may be falling to too low of a value. I would try increasing C311. To be sure you could take scope shots of the LED current, output voltage, and COFF pin and I would be able to tell you for sure from that.

    Regards,

    Clint