I am working on UCC28810EVM-003: LED driver EVM board I have doubts mentioned below,
1. How PWM frequency and duty cycle is related to the output constant current.
2. How we are getting constant current.
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*Corrected*: Without the PWM dimming, the DC output of the buck stage is fixed. By using a PWM to enable/disable the buck controller, the output current is lowered in (inverse) proportion to this enable/disable duty cycle. This current is fed through the half-bridge transformers T2 & T3 to the LEDs.
Are you not getting a constant current on the output?