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full bridge converter with IGBT and ir 2233

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joyce sue

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hello!i have problem in ir 2233. i have made driver circuit as par the datasheet. frequency of PWM is 20Khz.
but FAULT is always low ,and the led is on.Any idea why? QQ截图20120802004034.png
 
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Hi Joyce
In my opinion a 1 uF capacitor can't keep the charge for long times . ( don't forget that a boot strap capacitor needs high values ) . i think a 220uF or at least a 100 uf capacitor would solve your problem .
Best Wishes
Goldsmith
 
5V is not enought. Use minimum 12V. (max 20V)
 
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