Hi,
I am trying to switch from max253 with 78253 to sn6501 and the same transformer (3V3 to 3V3). But even after 3 re-tries I am not getting the driver to switch. Not even with the simplest test circuit replacing the transformer with two resistors on D1 and D2 against Vin, then Connected GNDs, and a cap from vin against GND. Looks almost as D1 and D2 just deliver Vin. From the max253 I am used to see a quite clear switching wave.
Anything fundamental I missed? I bascially followed the eval board design and the examles in the data sheet with some minor layout changes to adopt for 2 layer. I cannot imagine that the SN6501 is that sensitive to small deviations.
Thanks,
Bernd