Hello everyone!
I'm trying to design a buck converter with pmos as switch and nmos as diode by using TSMC 65um.
Vin=3.6V Vout=1.2V Iout=150mV Vripple<50mV f=1MHZ
I caculated : L=8uH C=0.25uF R=8Ω
I have two questions now and hope someone can help me:
1.For the pmos as switch, i caculated the power loss(conduction loss and switch loss)to get the optimum W/L value.But for the diode which using the nmos i don't know how to determine the W/L value of the mosfet in order to get the lowest power loss.