AVR-Chat

Good point - Most motors we use in robots and whatnot are pretty "poor" 
motors that don't work all that well at PWM over about 2KHz, so if you 
keep your PWM at 1KHz or lower then any H-bridge will work out fine for 
you - I tried 20KHz once on a TI 754410 and literally blew the top off 
of the chip.  <oops> at 2KHz it ran just fine.

DLC

David VanHorn wrote:
> On 8/27/06, dlc <dlc@frii.com> wrote:
> 
>>The enable is where the PWM goes, the IN1 and IN2 determine motor
>>direction.  It says that it is crossover protected so you don't need to
>>worry about turning on both FETs in either leg -
> 
> 
> 
> Beware: Most bridges have a maximum chopping speed. Beyond that, you may
> well turn on both fets and blow it.  BTDT on a chip that had this spec only
> on one rev of the data sheet, buried waaaaay down.
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
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>  
> Yahoo! Groups Links
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Dennis Clark          TTT Enterprises
www.techtoystoday.com
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