Hi team,
My customer designing a buck converter on MC33063A. Schematic i like this:
But the customer foun strange bevaior: IC usually have freqency about 73kHz, but at short circuit event, the frequency rises up to 147kHz.
Can you please explay why this happens?
There are scopes before a short circuit and during the short circuit.
Blue - voltage on Ct.
Yellow - voltage on pin 2.