Herbert,

Can you bootstrap a charge pump off the output of your bridge?  It's 
just a few diodes and caps.

Dave

Herbert Graf wrote:

>Hello everyone, I'm building an h-bridge using only NMOS devices (yes I
>have my reasons). Anyways, through simulation it appears that my
>intuition about this config was correct: the high side drivers aren't
>turning on fully as long as their gate drive is only as high as the high
>rail.
>
>So, I need to boost things so that I can get a Vgs of about 7V. Anybody
>have a VERY simple (i.e. just a couple jelly bean BJTs) that will give
>me a boost of 7V on a 24 or 48V rail? Don't really need much regulation,
>and since I'll only be drawing a few milliamps power capacity is a non
>issue. 
>
>Thanks for any suggestions. TTYL
>
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