Hi Joe, I don't think he is driving the IR2110 with an analog signal - he is driving it with PWM. However, he is trying to debug the circuit with a soundcard-based scope, with which he can only see the average of the waveforms (so, when he probes the FET gates, he sees a sinusoid rather than sinusoidal PWM). He realizes all this, but I am trying to convince him that he needs a scope which is fast enough to see the individual PWM pulses if he stands a chance of making sure that the FETs are switching properly. Sean On Sat, Nov 10, 2012 at 4:31 PM, IVP wrote: > Hi Manu, > > I might have misunderstood something, but are you driving a > digital buffer, the IR2110, with an analogue signal ? > > Is this an application that could use Pulse Position Modulation > (still based on your sine table) for digital drive, rather than PWM ? > > That said, I have a working schematic for a high power DC-DC > converter using the TL494 driving FETs/transformer with > complementary PWM > > Joe > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .