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TPS922055: Minimum on time in PWM dimming and Hybrid

Part Number: TPS922055

LED Driver team,

Our customer is testing TPS922055 with the EVM, and seeing the on time on the first cycle 2.2us, and then can be reduced to 150ns.  They're testing with PWM dimming and Hybrid dimming.

Their requirement is to start with a minimum on time at 0.1% of their 3.9 kHz PWM, so 256 ns.  How can they achieve this with TPS922055?

Thanks,
Darren