 555 flyback transformer MOSFET gets hot.
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ZakWolf
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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
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Posts: 608
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I built a similar driver; it has 3 resistors and one .o1 cap. I’m using an irfp260(that’s what I had on hand) and was wondering if there is a mosfet that would be better suited for this application, ie that would not heat up so much.
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Daedronus
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Registered Member #2329
Joined: Tue Sept 01 2009, 08:25AM
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Use a TC4420CPA between the 555 and the mosfet. It makes a big difference. Use a low R on the mosfet gate, 1 or 2 ohms.
I'm not using any R on the gate.
The TC4420CPA should have 2-5uF of capacitance directly across it's power pins. With a good non electrolytic capacitor, this also makes a big difference.
Irfp260 is more then enough and should not heat up with a proper driver.
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