and the MC34063 is REALLY long of tooth....

On 7/18/09, Mike Harrison <mike@whitewing.co.uk> wrote:
> On Sat, 18 Jul 2009 19:18:10 +0100, you wrote:
>
>>>I do it with an external mosfet for 3A and work very well,
>>>but I don=B4t be sure if this IC can work with an external
>>>P MOSFET for 20A.
>>
>>This would probably require some serious analysis of the output current
>>capability of the chip to see if it can drive the gate capacitance of the
>>FET. A 20A FET will have significantly higher gate capacitance than a 3A
>>FET, so your switching currents will be much greater.
>
> At that current you'll be paying enough for magnetics and FETs that you
> really should look at paying
> a little more for a controller designed for this power level instead of
> trying to bodge a cheaper
> part into doing something it isn't really designed for. If nothing else t=
he
> saving in heatsinking
> will probably pay for the cost of a more efficient controller.
>
> There are approximately one gazillion DC-DC chips out there so I'm sure
> you'll find something more
> suitable.
>
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