10 August 2015 Is there a way of protecting a typical MOSFET driver IC from being taken out by a MOSFET failure in a Class E LF amp? I was experimenting with drive level into my G3YXM 1kW 136 kHz amp
Yes there is. Or , are: several. Don't drive the MOSFET directly from the IC. Instead use a capacitor and DC restorer circuit. That guards against both the driver staying high permanently if driv
Am 10.08.2015 14:09, schrieb Chris Wilson: 10 August 2015 Is there a way of protecting a typical MOSFET driver IC from being taken out by a MOSFET failure in a Class E LF amp? Hi Chris, It can be hel
Forgot to mention, although I hope it is more than self-evident to readers here, the diode is orientated so it points 'upwards'; allowing a positive drive voltage to appear on the gate and clamping
Hello Andy, Monday, August 10, 2015 Thanks for the replies gentlemen! Would I need to make any other circuit changes to capacitively couple the gates? With the gates individually driven from separate
Maybe also worth to mention: Capacitive coupling of the driver to the gate will reduce the peak voltage at the gate by half (assuming 50% duty cycle). The IC driver voltage should be at least 12V in
Hello Rik, Monday, August 10, 2015 Hi Rik, thanks for that, I link to a `scope shot of the gate waveform, taken with a X10 probe, but the `scope does not auto compensate, so an 8V P to P signal I bel
Maybe also worth to mention: Capacitive coupling of the driver to the gate will reduce the peak voltage at the gate by half (assuming 50% duty cycle). The IC driver voltage should be at least 12V i
Hello Andy, Monday, August 10, 2015 OK, thanks and sorry for the naive questions, lots to learn, I was amused by my friend calling power FET's "Fire Emitting Transistors". I see his point now, they d
Andy, oops, you're right. I didn't read far enough down the mail to see that you also recommended diode restoration. I have to read more careful before replying ... 73, Rik ON7YD Van: owner-rsgb_lf_g
Hi My ten cents worth.... If you haven't looked at it before try http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-poweramps.pdf. Plough through the math and then forget look at the
