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All the required capacitors are included on the module, no external capacitors are required and additional input capacitors do no harm. 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 LMK had a rather loosely specified output voltage and it could vary by as much as mV without load and at room temperature. Many designs incorporated some circuitry to raise the output voltage to prevent under voltage resets of microprocessors.
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. Installed several of these on pinball machines, especially on WPC89 power driver boards. Works exactly as expected, with a word of warning though : it's necessary to use metal screws and nuts to maintain continuity between component and solder side.
The first time I installed one of these, it didn't work at all, because the small washer under the factory nut was shorting with a small SMD resistor - at least short circuit protection works. So I reajusted the nut and it worked absolutely fine. For my second try, I decided to use plastic nuts to avoid shorting the resistor. I took the board apart only to realise continuity was missing for the "casing" of the regulator. I've used over a Dozen of these now with NO problems.
Adjustable voltage is a plus and it runs very cool. Finally solved my reset problem on the Williams pinball have been working on. I changed 4 times the LMK with new ones, with the exact same result, the voltage kept falling down to 4. I install the PSU5 and wow! The voltage never drop below 5. 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. I bought one of these not to replace a LMK, 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. Only registered users can write reviews. Please, log in or register.
Qty: Add to Cart. More Views. Features: Drop-in replacement of the obsolete LMK or equivalent linear voltage regulator. Guaranteed 3A output current. Identical input voltage range of 7. Heatsinks are optional. Available with or without pins. Gold plated pins and PCB to withstand harsh environments over the long term.
Can drive inductive loads such as solenoids and DC motors. Works great for pinballs Review by Pierre Installed several of these on pinball machines, especially on WPC89 power driver boards. Review by Alain Finally solved my reset problem on the Williams pinball have been working on.
Review by Ralph I can't find a data sheet to provide full info on using this module. Write Your Own Review Only registered users can write reviews. You have no items in your shopping cart. Products Controllers Discounted Voltage Regulators.
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PSU5 LM323K Replacement
3-Amp, 5-Volt Positive Regulator