Uc3843 Switching Power Supply Schematic

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.

Uc3843 switching power supply schematic.

The schematic in my db of reverse engineered schematics. The transformer will be used for this purpose. 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. 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.

How o use uc3843 ic. Adjust vcc above the startup threshold before setting to 15 v. Conditioning a switch mode power supply current signal using ti op amps. The uc3843 can be used to regulate or limit current in application like smps rps dc dc converters line voltage regulators etc.

Dn 27 uc1842 uc1842a family summary of functional differences. On pin number 2. This winding is also used to power the uc3842. 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. Do not use it outside the limits of the power supply. Power supply current note 4 startup. It does not allow for feedback control of the output voltage.

Figure 1 the basic of dc switching power supply. This switching power supply operates in the wide range of nominal input voltages 100 240 vac and is short circuit proof. 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. This is a somewhat experimental circuit and i especially designed this circuit for those persons that want to dabble in switching power supply designs.

Starting of this supply is ensured by the 220k 2w resistor. The output voltage is totally determined by the turns ratio in transformer t1. Http danyk cz reverz44 en html today i made a teardown of an industrial switching power supply mod. The maximum total load is about 60w.

This circuit is based on a uc3843 integrated circuit. Both q1 and d2 will be passed to a high current this will work alternately. Dn 26 uc3842a low cost start up and fault protection circuit. The core of the switching transformer can be found in crt television or crt.

Uc3845 lifepo4 switch mode power supply charger.