The Fulree FW32D12A3 is a DC-DC converter that can convert from a range of input voltages to a stable 12V output. It can be found on eBay using the query “12V3A stabilizer” and purchased from multiple vendors.
The vendors often provide very sparse and superficial information, so I’ll try to fill in the gaps. I’ve used this converter successfully to stabilize an unstable 12V power supply so that a voltage-sensitive device could run off it.
Characteristics
| Parameter | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|
| VI | Input voltage | 5 | 32 | V | |
| VO | Output voltage | 12 | V | ||
| Icont | Continous output current | 3 | A | ||
| Vn | Output noise voltage | 10 | kHz | ||
| ΔTA @ 3A | Temperature above ambient | 32 | °C |
Typical performance
Noise
The output of the power conditioner has irregular electrical noise of about 10 kHz with an amplitude of 1.82 V on its output.
Usage example
I came to this device because my new infotainment system in my car crashed every time I started the engine. That happens because the voltage drops to about 9 V when cranking the engine. So I put the Fulree inline with the constant power from the battery. To avoid cutting into the wiring of my car I ordered a ISO 10487 extension that I spliced the Fulree into.
