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Solar PWM Charging Mosfet Selection

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sonar_abhi

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Hello Guys.

I am making a Solar Charge Controller with PWM. For PWM, I need to connect the MOSFET to the high side so as to control the current going into the battery from the panel.

If I connect an N channel MOSFET, that would need a charge pump to increase the gate voltage above the Vdd.
But if I use a P channel MOSFET, that would not be necessity, since I only need to turn off the gate supply for the MOSFET to conduct and vice versa.

Some of the examples on the net have used N channel with a charge pump and I really dont understand why they have not used a P channel MOSFET instead.

What would be a better selection in terms of efficiency and power dissipation.

Thanks
AS
 

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What battery voltage?
How much current?
Why PWM instead of just On/Off based on battery voltage?
 
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