On Tue, 13 Jul 2010 22:57:39 +0530, "Sarin Sukumar A" said:
> YOurs SaRIn....

> > I dont understand...
> i am asking about PIC24FJ256GB110 and its  "Internal Voltage Boost Assist
> for USB HOST Bus Voltage Generation" I have checked the schematics of
> demo
> boards also.. None uses this feature. But in the data sheet they have
> specified about this

On page 211 of datasheet 39879c.pdf the impression I get is that this is
a feature that Microchip has not fully fleshed-out.

But I have no experience with that chip, so my suggestion is to use
external powerwhile debugging, but set up the chip to use the PWM
output, then look at it with an oscilloscope to determine what frequency
is being used. Then choose a transistor, inductor, diode and capacitor
by using the applications information from a Linear Technology or
National Semiconductor boost regulator chip. That should get you to a
close-enough starting place.

Cheerful regards, Bob

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