The following diagram is the 50W offline switching power supply circuit design. The circuit powered by a MOSFET. BUZ80A/IXTP4N8 for 220V AC voltage input and GE IRF823 for 110V AC input voltage. The output will be 5VDC with electric current up to 10A.
The schematic diagram:
Components list:
R1 : 100 ohm at 25 deg Celcius
R2 : 1 ohm – 1W
R3 : 10 ohm – 1/4W
R4 : 100K ohm – 1/4W
R5 : 0.33 ohm – 1W
R6 : 10K ohm – 1/4W
R7 : 390 ohm – 2W
R8 : 22K ohm – 10W
R9 : 68 ohm – 1/4W
R10 : 10 ohm – 1/2W
R11 : 3.3 ohm – 1/2W
RL : 5 ohm – 10W
C1 : 22 nF/400V
C2 : 470 uF/250V
C3 : 470 uF/16V
C4 : 220 pF/100V
C5 : 470 pF/500V
C6 : 2.2 nF/500V
C7 : 270 pF/500V
C8 : 39 pF/500V
C9 : 11000 uF/6.3V
C10 : 100 uF/16V
C11 : 0.047 uF/10V
L1 : 25 uH
D1 : IN4937
D2 : MBR1035
T1 : Lp=9 mH, n=1:15
T2 : 50 uH, n=1:3
F1 : Fuse 1A/SB
M1 : Diode Bridge
Q1 : BUZ80A/IXTP4N80 (220V AC)
Q1 : GE IRF823 (110V AC)
The schematic shows a 50-W power supply with a 5-V 10-A output. It truly is a flyback converter operating inside the continuous mode. The offline switching power supply circuit has functionality of a primary side and secondary side controller will full-protection from fault factors for example, overcurrent. When the error condition has been removed, the power supply will enter the soft-start cycle prior to recommencing normal operation.
