Hi!
I'm doing a device - LED driver: 22V and 4A. The design of my device is almost completely identical to the reference design from the datasheet. When you start the device using the lamp it lights up and flashes showing short-circuit and overcurrent. At the gate of the transistor GT1 is present for PFC PWM the desired frequency (200 kHz), but the duty cycle always >90% and approaches 100%, creating a short circuit. At the gate of the transistor flyback Converter PWM is missing and there is always 0V.
Tell me what can be the error? I will be grateful for your help and advice!
My design: LED control.pdf