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Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
Again, no luck.
I used PC's power supply and +12V, GND lines. At iddle driver with "integrated" IRF520 draws 0.25A, nothing heats after half minute and I don't see any output of HV transformer. I've noticed only that this current was increasing slowly to 0.40A before I powered off. The NF4007 diode was replaced with UF4007. I guess I did connected something wrong, or transistors/IR2155 just died. Capacitor is 1.5nF (finally I've learned how to read number. On this capacitor was mark 152. So 15pF*10^2 = 1500pF = 1.5nF).
How can I check, what's wrong? Especially those IR2155... they weren't cheap and it's quite rare in my town (not like as in Russia or Czech).
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I checked your schematic again- oops! The connection from the upper FET's drain to Pin 8 of the ic certainly should NOT be there!! And I found another error in your schematic, you have a missing connection between where the two FET's connect together (lower's drain - upper's source) and Pin 6 of the ic!
Registered Member #528
Joined: Fri Feb 16 2007, 10:32PM
Location: Warsaw, Poland
Posts: 166
jmartis wrote ...
I checked your schematic again- oops! The connection from the upper FET's drain to Pin 8 of the ic certainly should NOT be there!! And I found another error in your schematic, you have a missing connection between where the two FET's connect together (lower's drain - upper's source) and Pin 6 of the ic!
I did solve this Pin 6 problem before. Now I've cut out upper FET's drain from Pin 8, but suddenly the iddle current drawing increased to ~7.5A and only both of MOSFETs are heating. IC, capacitor, resistors don't. No output, of course. I guess that's problem with oscillating, so probably IR2155 is just a dead one..
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