Part Number:BQ24640
I use an aux power 30v supply bq24640's VCC to avoid sleep mode, and output voltage design for 28.5v.
When Vin < 28.5, the idea Buck's output should be equal Vin, and the PWM should keep switch frequency with maximum duty.
But When Vin small then 28.5V, the switching frequency down to 0.65KHz (typ is 650KHz)
How do I avoid this situation?
