All-discrete topology.

Single-pass, series regulator design.

No IC (integrated circuits) are used.

Low noise, high PSRR.

A constant-current source feeds a zener diode as a stable voltage reference. A low-pass filter (with a corner frequency of 1.6Hz) prevents zener noise from being introduced into the error amplifier. This is an effective yet lower-cost alternative to expensive voltage reference ICs. The low-pass filter also provides a soft-start characteristic.

The error amplifier is a discrete implementation of an opamp with a high open-loop gain of 102.5dB. The voltage supply to the error amplifier is isolated with capacitance multipliers to boost its PSRR (power supply rejection ratio). This greatly improves the line regulation performance of the PSU.

A long-tailed pair differential amplifier with current mirror and constant current source forms the first stage of the error amplifier. The second stage is the voltage amplification stage (VAS), also with constant current source load. The 3rd stage is comprised of the power MOSFET output devices configured as a source follower.

High-current MOSFET pass transistors.

4 paralleled high-current, highly reliable MOSFETs (rated at 18A each) serve as the "pass" transistor.

The high current rating provides a very high safety headroom against overcurrent damage.

More sustained currents are possible by using larger, offboard heatsinks.

The negative temperature coefficient of MOSFETs prevents damaging thermal-runaway conditions that may plague conventional BJT devices.

Active ground isolation technology。

6 PCS Capacitor Array.

Use Schottky Barrier Rectifier.

Support 13A continuous current, 16A maximum.

PCB Size:  121X221X1.6mm    1oz Cu, HASL with lead

Typical output voltages are  48V.

If you need other voltages, please contact us.

Do not short the output terminal to discharge capacitor, otherwise it will damage the power board.

INPUT AC 28-0-28VAC

Transformer Power= (28+28)*(1+0.3)*I

For example:

48VDC-5A,
Transformer Power= (28+28)*(1+0.3)*5=364W; Please choose 400W;

48VDC-10A,
Transformer Power= (28+28)*(1+0.3)*10=728W; Please choose 800W;