Uc3843 Switching Power Supply Schematic

Power supply current note 4 startup.

Uc3843 switching power supply schematic.

This circuit is based on a uc3843 integrated circuit. The maximum total load is about 60w. This is a somewhat experimental circuit and i especially designed this circuit for those persons that want to dabble in switching power supply designs. Do not use it outside the limits of the power supply.

The schematic in my db of reverse engineered schematics. The feasible power output is approximately 120w. How o use uc3843 ic. Starting of this supply is ensured by the 220k 2w resistor.

Vcc 6 5 v for ucx843a vcc 14 v for ucx842a operating icc 0 5 12 1 0 17 0 5 12 1 0 17 ma power supply zener voltage icc 25 ma vz 30 36 30 36 v 4. During the q1 performance the current is passed through c8 c9 l1 and q1 when q1 stop or open circuit energy stored in l1 will evolve through d2 and c8 c9 in the same direction makes the output voltage is constant on all times. The uc3843 can be used to regulate or limit current in application like smps rps dc dc converters line voltage regulators etc. In today s video i ll show you how to make a switch mode power supply based on the uc3843 pwm driver ic.

Both q1 and d2 will be passed to a high current this will work alternately. Conditioning a switch mode power supply current signal using ti op amps. This winding is also used to power the uc3842. The core of the switching transformer can be found in crt television or crt.

The transformer will be used for this purpose. Http danyk cz reverz44 en html today i made a teardown of an industrial switching power supply mod. Dn 26 uc3842a low cost start up and fault protection circuit. It does not allow for feedback control of the output voltage.

Uc3845 lifepo4 switch mode power supply charger. In order to simplify the connection reduce the number of components and reduce the expected sources of problems the following sections have been omitted around the uc3843 circuit. The output voltage is totally determined by the turns ratio in transformer t1. This switching power supply operates in the wide range of nominal input voltages 100 240 vac and is short circuit proof.

The uc3842 and uc3843 are used for voltage regulation. Adjust vcc above the startup threshold before setting to 15 v. You will use it outside the limits of the power supply. On pin number 2.

12v smps adapter can be used to charge 12v battery by setting 14 2v but using too much voltage for 6v battery will cause malfunction.