[SOLVED] bootstrap IC practical note

[kamalifard]

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

 

[alexan_e]

You don't provide any schematic so I don't know how we are supposed to help.
There is an application note for IR2110, http://www.irf.com/technical-info/appnotes/an-978.pdf will this help?

 

[kamalifard]

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!

 

[FvM]

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?

 

[kamalifard]

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

 

[FvM]

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.