Had change different types of inductor to trying get rid of audible noise but still not find solution yet.
- PWM Frequency : 4kHz
- Switching Frequency : 750kHz
Below two photos are output current upon PWM(4kHz) duty.
I can see there's ripple current and guess it's the reason of audible noise.
Need help guide me to eleminate ripple current by seeing schematic on my previous post.
