Uc3843 Switching Power Supply Schematic

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.

Uc3843 switching power supply schematic.

This is a somewhat experimental circuit and i especially designed this circuit for those persons that want to dabble in switching power supply designs. The maximum total load is about 60w. On pin number 2. The output voltage is totally determined by the turns ratio in transformer t1.

The transformer will be used for this purpose. Dn 26 uc3842a low cost start up and fault protection circuit. Uc3845 lifepo4 switch mode power supply charger. The schematic in my db of reverse engineered schematics.

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 uc3842 and uc3843 are used for voltage regulation. Adjust vcc above the startup threshold before setting to 15 v. Dn 27 uc1842 uc1842a family summary of functional differences.

Both q1 and d2 will be passed to a high current this will work alternately. You will use it outside the limits of the power supply. So if you are looking for an ic to produce pwm signals for controlling a power switch based on the current flowing through the circuit then this ic might be the right choice for you. The uc3843 can be used to regulate or limit current in application like smps rps dc dc converters line voltage regulators etc.

How o use uc3843 ic. Do not use it outside the limits of the power supply. The core of the switching transformer can be found in crt television or crt. The feasible power output is approximately 120w.

Http danyk cz reverz44 en html today i made a teardown of an industrial switching power supply mod. 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. This winding is also used to power the uc3842. This circuit is based on a uc3843 integrated circuit.

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. Figure 1 the basic of dc switching power supply. Conditioning a switch mode power supply current signal using ti op amps. Power supply current note 4 startup.

It does not allow for feedback control of the output voltage.