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This is a 5V 3A switch-mode voltage regulator. It is a high-efficiency replacement for popular three-terminal LM323K linear regulators and it is pin-to-pin compatible with the common and now obsolete LM323K linear regulators. The mechanical design allows the PSU5 to fit anywhere where an LM323K was used. The bottom of the PCB is ground, just like the case of the LM323K. The maximum continuous output current is 3A and at room temperature the PSU5 does not need a heatsink to maintain this current indefinitely. All the required capacitors are included on the module, no external capacitors are required and additional input capacitors do no harm. The output voltage guaranteed to be within +/-1% as the load varies. The module has a (tiny) trim potentiometer and the voltage is factory adjusted to within 50mV of 5V with a 12V input and a 1A load. The original LM323K had a rather loosely specified output voltage and it could vary by as much as 250mV without load and at room temperature. Many designs incorporated some circuitry to raise the output voltage to prevent under voltage resets of microprocessors. The PSU5 LM323K replacement design can be adjusted by up to 500mV in either direction with the trim pot to ensure compatibility with almost all circuits that used the LM323K. The module has thermal shutdown and current limit protection. The absolute maximum input voltage is 20V. The PSU5 can be mounted on existing heatsinks, even ones that use sockets under the heatsink. The hole diameters and pin diameter is exactly the same as the original package dimensions.
I can't find a data sheet to provide full info on using this module. At least it would be useful to provide a part number for the chip used. I can see the board is bigger than the TO-3 package it replaces. I would need to have full mechanical details before I could use this device.
I give this device a C- until they provide a data sheet. (Posted on 10/3/15)
I bought one of these not to replace a LM323K, but to use in a new project.
I couldn't be happier. It's very easy to interface with, and runs very cool, even with a 2A draw. It's small, and looks very neat too, which I always like.
Would definitely recommend. (Posted on 8/1/14)