Spec says 6A, but stall might be higher.  I'm calculating for 10A=20
initially (but plan to measure and can tweak later).
I'm thinking I'll keep PWM frequency about 50khz or higher to stay out=20
of audible range).
I had searched Digikey earlier but did not find any h-bridges I liked. =20
But I can find N and P-FETs with 10mOhm RdsOn that should work very well.

Cheers,
-Neil.



On 12/16/2014 1:43 PM, Bob Blick wrote:
> Hi Neil,
>
> There are plenty of off-the-shelf H-bridge ICs. What current level do
> you require, and what frequency of PWM (if any)?
>
> Cheers, Bob
>
> On Tue, Dec 16, 2014, at 10:17 AM, Neil wrote:
>> Hi all,
>>
>> I'm designing an H-Bridge to drive a 12V motor from a PIC, and I
>> understand most of the basics and math, but not clear on when to use
>> P-channel and N-channel FETs vs all 4 N-ch FETS.  I expected I'd use
>> PFETs & NFETs, with smaller transistors on the gates of the P-FETs to
>> get the gate up to 12V to switch off properly, but I've see examples to
>> the contrary (using all N-FETs).  Is there a specific reason?
>>
>> A pointer to a good H-bridge tutorial would be great.
>>
>> Thanks.

--=20
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