sonar_abhi
New Member
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
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