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This switching power supply circuit diagram is based on the MC33374 high power voltage switching regulator IC manufactured by Motorola Semiconductor . This switching power supply circuit will provide a maximum output power around 90 W and require few external components .
The MC33374 switching regulator IC is a monolithic high voltage power switching regulators that combine the required converter functions with a unique programmable state controller .
The MC33374 switching regulator IC is designed to operate directly from a rectified AC line source, and in flyback
converter applications are capable of providing an output power in excess of 150 W with a fixed AC input of 100 V, 115 V, or 230 V, and in excess of 90 W with a variable AC input that ranges from 85 V to 265 V.
The MC33374 switching regulator offers features like : Programmable State Controller , On–Chip 700 V SENSEFET Power Switch Circuit , Rectified AC Line Source Operation from 85 V to 265 V , On–Chip 700 V Active Off–Line Start–Up Circuit , Latching PWM for Double Pulse Suppression , Cycle–By–Cycle Current Limiting , Input Undervoltage Lockout with Hysteresis , Non–Latching Internal Thermal Shutdown .
This switching power supply circuit based on the MC33374 regulator IC has a efficiency of 83.2 % at 115 V AC input voltage and a 85.4 % efficiency at 230 V with IO= 6 A .
The output voltage of this switching power supply is 15 volts and the maximum output current is 6 A .
The hard part of these switching power supply circuit is to design the T1 transformer , but you have the design data for that bellow , or you can buy a transformer from Coilcraft .
Z1 is a zenner diode and is used to limit the voltage on Pin 5 and a damper circuit consisting of resistor R2 and capacitor C2.
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