Description
A revised V2.1 kit has superseded this. Legacy information below:
PCB Size: 65mm x 20.5mm.
A nylon 3D printed housing is available to purchase here, or to print your own, download the STEP files here.
| Parameter | Value | Note |
|---|---|---|
| Input voltage | 8–18 V DC | — |
| Output voltage | 9.0 / 12.0 / 13.8 V | Set via header pins, trim via R7 |
| Max output current | 2 A | Continuous |
| Dropout voltage | <100 mV | At 1 A |
| Quiescent current | <6 mA | Vin = 13 V |
| Load regulation | ~20 mV / ~40 mV | 0.1 A to 1 A / 0.1 A to 2 A |
| Output ripple | ~2 mV p-p | Approximation from oscilloscope capture |
| Transient response | ~30-100 µs recovery | 0.1 A ↔ 1.5 A |
A no-load offset of 20-30mV is exhibited, resolving at currents above 30 mA. Adding a pre-load resistor is recommended for applications requiring tight regulation accuracy at very light loads.
- Partially-assembled VLDO V2 board
- Through-hole components for self-assembly
- Heatsink and M3 screw
- Shunts for voltage selection
Thermal paste required for assembly, not supplied.
Input and output through-hole pads accommodate up to 18 AWG stranded wire.
Power dissipated in the pass element is:
The supplied heatsink is rated for 1.5 W continuous, or 3 W at 50% duty cycle (typical for SSB/CW radio operation). At a 13.8 V input and 12 V / 1 A output, dissipation is 1.8 W – typical intermittent operation will not require external cooling. For higher input voltages, increased current, or continuous-duty operation at maximum load, external cooling is required. Bottom-mount the PMOS to couple the pass element directly to a metal enclosure or a larger external heatsink.
The PCB includes a clearance hole for bottom-mounting to a larger heatsink or enclosure. The pass device is fully isolated – no insulating hardware is needed.
*ichardit** –
Prompt shipping, no issues whatsoever. Item as described.
*eekjun** –
Arrived quickly, I probably would have been struggling buy the components and create a board for less than the kit. Just the job to run a QMX off 4S LiFePo4
*ogerinwale** –
Excellent little kit. Great instructions, well packaged. Works very well as intended. Ideal for my QMX when up the in the hills. I can thoroughly recommend.
*eocat3** –
Excellent transaction, communication and value for money. Very useful and quality packed product. Quick delivery. As described.
*drn** –
Good quality kit. Prompt dispatch and delivery. Nice helpful message received from the seller. Good support/instructions available. This I my second purchase from this seller and I am sure to buy again