50W Buck Converter
0.4% ripple voltage
Semi Perfect Square Wave Modulation
No IC
Automatic FM and PWM
Mosfet IRF9540 (Low Rds)
Zener 1N4734 (or a LM7805 with a diode between ground pin and ground)
Transistor BD139 and BD140
Full Load Efficency
Eff = Pout / Pin
Pout = 5v * 10A = 50W
PWM = 5v / (10.5 - 1.78) = 0.573
Pin = 12v * 10A * PWM = 68.8W
Eff = 72.6 %
