Thanks Bob, for the reply.
 > I doubt very much this circuit will work at 80KHz.
 > You'll need much stronger turnoff than a 10K resistor
 > on the gates of the MOSFETs.
What do you suggest? Should I be opting for dedicated MOSFET drivers?

 > Also I question your use of the entire N-channel part
 > of the circuit - throw it out and use a single
 > schottky rectifier there.
Its a bit difficult for me to get a high current (>10A) schottky diode. 
The max I can get is an MBR745, rated for 7.5A.

 > Next is your output filter - there's way too much
 > capacitance. You may not need very quick reaction
 > time, but it's a waste either way. Try 22 uH and 2.2
 > uF. Then you can use a ceramic capacitor. Your ripple
 > will be low enough. Use a bobbin ferrite inductor -
 > shielded preferably.
Will do.

 > Use a P-channel MOSFET with lower resistance. You
 > don't need the 100 volt rating of the IRF9540n.
Actually its the 23A rating that I like. Also, its the best I can get. 
Most of the other P-channel MOSFETs I can source easily, with such a 
current rating are either too expensive or have larger Rdson.

Thanks once again,
Mohit.


Bob Blick wrote:
>> The design is here:
>>
> http://picasaweb.google.com/schouse/Electronics/photo#5094485161260312626
> 
> Hi Mohit,
> 
> I doubt very much this circuit will work at 80KHz.
> You'll need much stronger turnoff than a 10K resistor
> on the gates of the MOSFETs.
> 
> Also I question your use of the entire N-channel part
> of the circuit - throw it out and use a single
> schottky rectifier there.
> 
> Next is your output filter - there's way too much
> capacitance. You may not need very quick reaction
> time, but it's a waste either way. Try 22 uH and 2.2
> uF. Then you can use a ceramic capacitor. Your ripple
> will be low enough. Use a bobbin ferrite inductor -
> shielded preferably.
> 
> Use a P-channel MOSFET with lower resistance. You
> don't need the 100 volt rating of the IRF9540n.
> 
> Cheerful regards,
> 
> Bob
> 
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