Tool/software:
Hello:
The 2nd prototype board using LM51561 in flyback mode is not even starting up.
Does the oscillator not free run if pin 12 is above UVLO level? In this circuit, it is connected to input BIAS pin which is 5V.
What else could go wrong?
Unlikely that the exposed pad is not connected to GND plane.
Power level is a few watts: used mainly for generating floating gate drive bias voltages for high bandwidth power switches.
Any comment on how to test/force it to run the oscillator will be highly appreciated.
Only the relevant part of the ckt is attached.LM51561ckt_for_TI.pdf
-r