Hi Harry,

"Harry Dellamano" wrote in message
...
Looking at the pics of the current ramp you can see that it is turning off
at two different voltage levels, 38mV and 50mV every other cycle.

I believe it only turns off at 38mV because the IC has a maximum duty cycle
clamp that (if you don't mess with the Vsrc pin, as I haven't on the PCB yet)
always terminates cycles at ~95%.

The error amp output is oscillating at Fo/2 or sub-harmonic oscillation. It
is very difficult to get 65% duty no matter how much slope comp you have.
Change the turns ratio for max duty at 60%.

OK... I'm playing with output inductors at the moment, but I'll try that in a
bit if I don't make any headway.

Looks like the reset winding may not be necessary.

Agreed -- I was actually a little surprised about that!

---Joel