Constant Current Constant Voltage Power Supply Schematic

Hi i m trying to build an adjustable constant current constant voltage power supply using a lm2576.

Constant current constant voltage power supply schematic.

This circuit produces an output that may be equal to the input supply voltage but the current is well regulated and can never exceed the 5 amp mark. The lt3741 simplifies the design of constant current constant voltage regulators by combining an accurate current regulator and an accurate voltage regulator in a single ic thus eliminating power system design trade offs. I need to adjust the voltage to approximately 24v and then set the current limit between 0 and about 4a. For example suppose the power supply is set to 5 v and current limit is set to 1 a.

As is the current sense amplifier gain of the lm5117 which has a typical value of as 10. A cmos op amp number icl 7611 controls the input current through a p channel hexfet power transistor no. When the load connected draws current less than 1 a the power supply will maintain voltage control in cv mode. This power supply has following features.

A constant current circuit can also be used as a current limiter. In this circuit we use a lm317 to control a mj2955 15 amp pnp transistor. Simple 5 amp regulated power supply circuit. As they are connected in a serial form so use the together current by i vref r1 while the vref to be defined by the ic2 is 1 25v.

Rs is the current sense resistor of the power stage used to generate a ramp for the current mode pulse width modulation pwm loop. Output voltage 1 30v continuously adjustable. Irf 9520 then to keep up a constant voltage across the r1. How does the power supply circuit work.

I preferably want to use a op amp which will work on a single supply like a lm358. If the load draws current at 1 a the supply will automatically switch to cc mode. As you can see the cm pin enables you to omit the series power dissipative current sense resistor at the output. A constant current source ccs in electronics is a device circuit that produces a constant value of current regardless of source voltage or load resistance.

The above circuit is for testing only. Input voltage 12v dc. R1 is precisely selected so as to maintain a safe 5 amp maximum current limit that can be withdrawn from the circuit. Voltage causes a current not the other way around so to make a device that provides a constant current no matter the load we have to use negative feedback and convert the current flowing through our load into a voltage.