20W Dual Output DC-DC Boost-Buck Converter Module
Build a compact positive and negative power supply for your electronics projects with this adjustable dual output DC-DC converter module. It accepts a DC input and provides positive and negative voltage rails around a common ground, making it useful for op-amp circuits, audio preamplifiers, analog electronics and instrumentation.
The onboard trimmer adjusts the output voltage. Common settings include ±5V, ±6V, ±9V, ±10V, ±12V, ±15V and ±24V, within the module's operating limits. These are adjustment examples for one module, rather than separate fixed-voltage products.
Key Features
- Positive and negative DC outputs with a shared ground.
- Boost-buck conversion for flexible low-voltage power supply projects.
- Adjustable output using the onboard trimmer potentiometer.
- Compact PCB with three toroidal inductors and filter capacitors.
- Suitable for low-power analog and audio circuit development.
Technical Specifications
| Product type | Adjustable dual output DC-DC boost-buck converter |
|---|---|
| Board marking | DD39AJPA, as shown in reference photos |
| Listed input range | 3.6–30V DC; usable range depends on the selected output and load |
| Listed output range | Approximately ±3V to ±30V DC, adjustable relative to GND |
| Listed maximum power | 20W; actual usable power depends on input voltage, output settings, load and cooling |
| Output connections | V+, GND and V− |
| Input connections | VIN and GND |
| Adjustment | Onboard trimmer potentiometer |
| Approximate dimensions | 60 × 23 × 20 mm, based on the supplier size image |
Load limits: The positive and negative rails have different current capabilities. Do not assume 3A on each rail or 20W at every setting. The earlier listing gives the following reference limits; these depend on operating conditions and are not simultaneous guaranteed ratings.
| Output setting | Positive rail reference maximum | Negative rail reference maximum |
|---|---|---|
| ±5V / ±6V | 1A | 200mA |
| ±9V | 800mA | 180mA |
| ±12V | 700mA | 150mA |
| ±15V | 600mA | 120mA |
| ±24V | 400mA | 100mA |
Typical Applications
- Operational amplifier and analog signal circuits.
- Audio preamplifiers and low-power audio electronics.
- ADC/DAC support circuits requiring bipolar rails.
- Instrumentation, measurement and DIY electronics projects.
Connection and Adjustment
- Identify VIN, GND, V+ and V− from the PCB markings before connecting.
- Connect a suitable DC supply to VIN and GND with the correct polarity.
- Measure both outputs relative to GND and adjust the trimmer before connecting your circuit.
- Check voltage stability and temperature under the intended load. Provide ventilation and reduce the load if the module becomes too hot.
Important: Follow the supplier wiring guide, which states that positive and negative outputs should be used together. Check negative-rail regulation in your application. This is a DC-input module; do not connect it directly to AC mains.
Package Includes
- 1 × adjustable dual output DC-DC boost-buck converter module.
Reference photos show both screw-terminal and solder-pad board versions. Terminal fitting may vary; confirm the supplied version if connectors are important to your project. External power supply, wires and enclosure are not included.
Frequently Asked Questions
Does ±12V mean a 24V output?
It means +12V and −12V measured separately against GND. The voltage between the two rails is approximately 24V, but the rails have different current limits.
Can I select different output voltages?
Yes. Adjust the onboard trimmer and verify both rails with a multimeter. Available voltage and current depend on the input supply and connected load.
Can this power a large audio amplifier?
Choose it for low-power circuits within its verified output limits. Check your amplifier's requirements, especially the negative-rail current, before use.