[SOLVED] bootstrap IC practical note

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kamalifard

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hi
i have some problem using bootstrap IC IRF21XX series they fault immediatly after input voltage connection, other part are OK it works well by a ferrite pulse transformer.
please help me by application note or other text or neccessary practical notes :roll:
thank
 

hi
when replace magnetic driver by bootstrap IC, it faults immediately what is the resons and how can I to solve it?
are this technic useable for very low frequency?
with best regards!
 

What's very low frequency for you? Bootstrap drivers can work with low frequency (e.g. 50 Hz) with respective boostrap C values.

Which kind of failure do you observe?
 

bootstrap IC fault immediately
lowest freq that i want to do is DC frequency for DC old motor that change rotation side by a fullbridge dc inverter that only change polarity of applied voltage
 

The bootstrap driver doesn't work for DC output. You'll need an auxilary supply voltage (on top of the positive bus voltage) to recharge the bootstrap capacitor.
 
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