500W Buck Converter DC 12-95V to 1.5-90V 18A Adjustable Power Module

$50.93 $68.92

500W Adjustable Step-Down Power Module – Constant Voltage & Constant Current Buck Converter

Take precise control of your DC power projects with the Gaqqee 500W Step-Down Buck Converter. Designed for electronics enthusiasts, engineers, and makers, this high-performance non-isolated power module delivers continuously adjustable voltage and current with up to 96% conversion efficiency. Whether you're driving LEDs, charging batteries, or powering custom electronics, this module offers rock-solid regulation in a compact, versatile package. Made in Mainland China.

Key Features

Wide Input Range: Accepts DC 12V–95V input, making it compatible with a broad range of power sources.
Adjustable Output: Output voltage continuously adjustable from 1.5V to 90V; output current adjustable from 0.3A to 18A.
High Efficiency: Step-down rectification scheme achieves up to 96% conversion efficiency, minimizing heat generation.
Dual Mode Operation: Supports both Constant Voltage (CV) and Constant Current (CC) modes for flexible application.
Short-Circuit Protection: Built-in constant current protection guards against short-circuit events.
Reverse Polarity Protection: MOSFET-based reverse connection protection — no damage if positive/negative terminals are accidentally swapped.
Soft-Start Switch: Integrated soft-start prevents inrush current spikes on power-up.
ON/OFF Control Switch: Convenient toggle for safe wiring when input voltage exceeds 36V.

Full Specifications

Module Type	Non-isolated step-down (buck) module
Input Voltage	DC 12V – 95V
Output Voltage Range	1.5V – 90V (step-down only; output must be lower than input)
Input/Output Voltage Difference	Minimum 2V
Constant Output Current	0.3A – 18A (continuously adjustable)
Rated Output Current	15A (natural cooling)
Rated Output Power	400W (natural cooling); up to 500W with active cooling
Operating Frequency	120 kHz
Conversion Efficiency	Up to 96%
Operating Temperature	-10°C to +65°C
Short-Circuit Protection	Yes (constant current mode)
Reverse Polarity Protection	Yes (MOSFET-based)
Output Reverse Current Protection	No (add external diode for battery/motor loads)
Brand	Gaqqee
Package Contents	1 × Power Module

How to Adjust Voltage & Current

Tools needed: Multimeter, flathead screwdriver

Voltage Adjustment: Rotate the blue potentiometer on the power board. Clockwise increases voltage; counter-clockwise decreases it. Monitor with a multimeter for precision.
Current Adjustment: Set multimeter to 20A or 10A range. Adjust supply output to 5V. Turn the constant-current potentiometer counter-clockwise ~10 turns to reach minimum current. Short-circuit the output terminals through the ammeter, then rotate the potentiometer clockwise to your target current value.

Important Safety & Usage Notes

This is a step-down only module — output voltage must always be lower than input voltage.
If input voltage exceeds 36V, set the ON/OFF switch to OFF before wiring, then switch to ON after connections are made to prevent arcing.
Under natural (passive) cooling: maximum 400W / 15A. For loads exceeding these values, add an active cooling fan.
Do NOT directly short-circuit the input negative terminal to the output negative terminal. This module uses low-side current detection — doing so will disable constant-current mode and may cause damage.
When driving inductive loads (motors) or charging batteries, add an external reverse protection diode to the output.
Overvoltage protection is not built in — do not exceed the rated 95V input.

Frequently Asked Questions

Q: What is the difference between the 400W rated power and the 500W listed power?

A: The module is rated at 400W output under natural (passive) air cooling at a maximum of 15A continuous. The 500W capability can be reached when an active cooling fan is added to handle higher thermal loads. Always ensure adequate cooling for sustained high-power operation to maintain efficiency and longevity.

Q: Can this buck converter boost voltage as well as reduce it?

A: No. This is a step-down (buck) converter only. The output voltage must always be at least 2V lower than the input voltage. If you need to increase voltage, you would require a separate boost (step-up) converter module.

Q: Is this module suitable for charging lithium batteries or running DC motors?

A: Yes, with an important precaution. When connecting to inductive loads such as motors, or when charging batteries, you must add an external reverse protection diode to the output terminals. The module does not include built-in output reverse current protection, and omitting the diode may cause damage to the module or the connected device.

Q: How do I safely wire the module when using a high-voltage input above 36V?

A: Before making any wiring connections, set the ON/OFF switch on the module to the OFF position. Connect all input and output wires first, then apply power to the source, and finally flip the switch to ON. This procedure prevents potentially dangerous arcing or sparking during the wiring process.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.