Power supply circuit guidance

yunshan_mc

Power supply circuit guidance [Copy link]

The attached circuit has insufficient load capacity. When the output voltage exceeds 100ma, the output voltage drops seriously. Please give me some advice. In addition, the resistor R1 has been adjusted to 470 ohms.

gmchen

Add a high-power transistor to form a Darlington structure with T2. Try

maychang

I'm too lazy to search the 1N5985 manual. What is the rated voltage of this type of Zener diode?

The label on the far left is VS1 5, is that a 5V voltage source?

Since it is a simulation, why not clearly state the numbers of the four voltmeters and one ammeter in the simulation results in the post?

Gen_X

T2 uses a high-power tube with a beda value higher than 300.

Gain is too small.

bqgup

Add an emitter follower to the back stage circuit to improve the circuit's load capacity

se7ens

The value of R2 needs to be reduced

Or reduce the value of R1

Or change to T2 with higher magnification

埋土书生

Check if the left power supply is current limited. When the voltage drops, how much voltage is left at the emitter of T2? The circuit does not look like it will experience a voltage drop.

Or you can try to reduce R2 to increase the system bias current