0.75-4.5V Adjustable Output DC-DC Power Supply, 9-32V Ultra-Wide Input, 3A Output
The pt1-OKIT3W32-4V5max is a robust and stable power supply providing four outputs, adjustable from 0.75V to 4.5V, at a maximum of 3A. The board is built around a Murata OKI-T/3-W32 DC-DC switching (buck) converter, which does not require a heat sink. The input voltage can be anywhere between 9V and 32V, supplied through the screw connector or the barrel jack connector.
The module features an onboard fuse, protecting the circuit against sustained input reversal. The power output is also protected against short circuits and over temperature. The converter will automatically restart after the short circuit condition is removed. The circuit has added some translator logic to provide a (positive) logic ENABLE signal (e.g., 3.3/5V).
Features
- 9-32V ultra-wide input, power provided through screw or barrel jack connector
- four outputs, adjustable from 0.75v to 4.5V, at a maximum of 3A in total
- built around Murata OKI-T/3-W32 DC-DC switching (buck) converter
- very high efficiency, not requiring any heat sinks
- protected against sustained input reversal through an onboard fuse
- protected against short circuits and over-temperature
- automatic restart after a short circuit
- (positive) logic ENABLE signal (e.g., 3.3/5V)
- all based on robust through-hole components (except for the OKI-T/3-W3 converter)
- the board is standing on four brass standoffs, allowing you to place it on a working table or integrate it into a larger assembly
- board size: 52.75×34.00mm; bolts: 46.75×28.00mm (M2.5)
- high-quality PCBs designed in KiCad and produced by Aisler (Germany), PCBWay (China), and OSH Park (USA)
- the board comes fully assembled and tested
- power cables available
NOTE: the total output voltage range runs from about 0.75V to 4.5V; if you need a more limited range (to protect the hardware you will be connecting to this module), select one of the other (more restricted) ranges
NOTE: the module requires a different fuse depending on the input voltage (2A for ~12V input, 1A for ~24V input); make sure you select the suitable module for your application
NOTE: the module will only start when a high logic ENABLE signal is provided; if you need a module that is always on, select the type without the ENABLE signal logic

Usage
I’ve created this board as a low-voltage power supply for my LED applications (often based on the TI TLC5947 constant current LED driver) and to feed the filaments of the VFD display tubes I use in my projects.
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