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PETH-1074.php 5585 Bytes 21-10-2015 08:38:27
A small power supply for universal use.
This project describes a little power supply, based on a LT1074, adjusteable from 2.5 to 50 V, delivering much more than 1 Amp.
Yet another nice to have building block :-)
• Output 2.5 to 50 VDC @ 3 A regulated low ripple DC voltage
• Onboard potentiometer for output voltage adjust
• Onboard bridge rectifier for AC voltage input
• Screw Terminal connectors for input and output
• Four mounting holes of 3.2 mm each
• PCB dimensions 52 mm x 45 mm
The PETH-1074 power supply - small and useful ...
The circuit consists of a bridge rectifier, build with 4 diodes (1N5062), then a storage capacitor 2200 µF, 35V (may be changed),
an LT1074 and a 47 µH inductor. An SB560 schottky diode was used. The circuit is not that new or stupendous, but it is a handy circuit which should be in every library of building blocks.
Designed for educational purposes.
In order to test the performance, we built some of those circuits. We used the following equipment : LD-300 DC ELECTRONIC LOAD BY TTI,
FLUKE 8846 A to do the measurements. One voltage which is very often used is +5 V. The diagramm below shows the measured characteristic.
Step Response when current is increased from 500 mA to 3000 mA. When dissipating a lot of power, a heatsink mayst be adviseable. The region
with the higher ripple corresponds to the higher current.
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