Other Parts Discussed in Thread: LM2575
Hi
Channel 2- Inductance current.
Channel 3- SW Switching waveform.
1. 25℃ Testing: Load >300mA. Switching is stable.
2. -40℃ Testing: Load >300mA. Switching is unstable. When we increase Input voltage to 30V, There has big/small duty change rapidly and result in bigger output ripple wave.
But this made me confused , Usually at light load, there maybe has Big/Small duty change rapidly . But why increase Input voltage and at low temperature there also happen it.
3. 65℃ Testing: Load >300mA. Switching is stable.
So, this maybe Cap result in because of Cap at low temperature ?
What result in diffrent duty and frequency
