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Re: h-bridge question

From: jim ruxton   cinetronpassport.ca
Date: Tue, 4 Jan 2005 20:18:09 -0800

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Hi Nick,
I believe the IR2105 is only a half bridge. You would need 2 to make a
full H bridge.

> I'm looking at driving a motor with an h-bridge. Some of them have a + 
> and - current rating e.g. IR2105STR is rated at +210mA/-360mA. Can 
> someone explain this?
Since it is a half bridge it means the top transistor or sourcing
transistor has a lower capacity than the bottom or sinking transistor.
It's pretty common that a pnp for example of the same size has a lower
rating than an npn. Same goes for FETs. If you put two of the IR2105s
together to make a full bridge the rating in both directions would be
the lower rating ie. 210 ma. 
Jim

>  I'm used to a flat rating of 2 Amps for example.
> Thanks,
> Nick
> 
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