DPRG mailing list archives: [DPRG] All N-channel MOSFET H Bridge a myth ?

Mon Oct 9 11:47:27 CDT 2006

It is not a myth.  You just have to have the right driver/buffer chip. 
Check out the HIP4081 H-bridge driver.  The same chip used in the Open 
Source Motor Controller (OSMC).  It was made by Harris Semiconductor but 
they sold it to Intersil.

The HIP4081 contains all of the circuitry for driving an all N-channel 
MOSFET H-bridge.  It has charge pump voltage boosters to drive the upper 
MOSFETs.  It also has circuitry to prevent shoot through (both upper and 
lower MOSFETs on at the same time).  It requires a 12v power supply, 
drives bridges up to something like 80v, and the input signals are 5v 
TTL compatible.

It has an analog cousin HIP4080 that uses a DC voltage to control the 
PWM output.  I've seen class D amplifiers that use this chip to provide 
HIGH power audio amplification into speakers.  As a note: The 4081 just 
has 4 on/off inputs corresponding to the 4 outputs, it does not generate 
any internal PWM.

 > Vimal Shankar wrote:
> I know, I know...
> 
> All the veterans thinking "Here starts the H Bridge
> topic again".
> 
> Crops up every century, now and then, I see....
> 
> But the problem is, reliable information is really
> hard to come by.
> 
> Found a lot of bipolar MOSFET designs on the web, and
> found a few all N Channel designs too, but the best
> documented one, unfortunately, has "OBSOLETE" marked
> on it by the author.
> 
> Is an all N-channel MOSFET H Bridge a myth ?
> 
> PS : Does this email warrant a few links to
> substantiate my thoughts ? Let me know.
> 
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