ZK-4KX power supply module

Cheap but handy DC/DC converter module.

Pros:

Cons:

ZK-4KX

Two latches on the sides for mounting on the panel.
ZK-4KX

Module has two stacked PCB, connected by two 5-pin headers. The "bottom" one (the one with radiator) is the actual DC/DC converter, the "top" one contains control unit with display.
ZK-4KX

Bottom board is held by some thermal glue, top one by latches.
ZK-4KX

ZK-4KX

ZK-4KX

ZK-4KX

Microcontroller: Nuvaton N76E003. Relatively new part (announced in 2017), 8051 core with 18 kB FLASH and 1 kB SRAM, internal RC oscillators, 8 channels of 12-bit ADC 300 kSps.
TM1621B LCD driver.
ZK-4KX

UART and probably programming (IAP) interfaces.
ZK-4KX

ZK-4KX

ZK-4KX

LM358 operational amplifiers.
FP5139 DC/DC converter controller.
ZK-4KX

I was using this module for about two years without proper enclosure until finally commiting to create more permanent setup.

Initial layout plan.
ZK-4KX assembled power supply

For a power source I've used switching mode power supply from old Lexmark printer, 30V/1A, with a grounded output (important for me).
ZK-4KX assembled power supply

As I've pretty often used this power supply for charging multiple USB devices, I've added three double USB sockets. With this power supply charging current can be limited (potentially extending battery life) and it is also possible to determine charging state and battery condition.
ZK-4KX assembled power supply

ZK-4KX assembled power supply

Two part metal enclosure was made of scrap metal sheet from old PC cases. I do have only rudimentary tools and bending was made by hand after cutting the groove. Not too clean, but still acceptable in my opinion.
ZK-4KX assembled power supply

If I would be doing this again, I probably would made it slightly smaller - there is a little bit too much empty space inside.
ZK-4KX assembled power supply

ZK-4KX assembled power supply

ZK-4KX assembled power supply

So far I've opted for self-adhesive feet. Time would tell if this is durable.
ZK-4KX assembled power supply

ZK-4KX assembled power supply

ZK-4KX assembled power supply

Back to reviews / teardowns / repairs list.


 "Cookie monsters": 7798883    Parse time: 0.000 s