The AC-DC 3.5W Precision Buck Converter Module is a compact, high-performance isolated switching power supply designed for space-constrained electronics projects. Whether you are powering a microcontroller, an IoT device, or a smart home sensor, this module allows you to step down mains voltage (AC) directly to a stable DC output (5V, 9V, or 12V) without the need for bulky transformers.

This module features a bare-board design with high efficiency, low power consumption, and low output ripple. It comes equipped with built-in protection against over-current, overload, and short circuits, ensuring the safety of your connected components.

Key Features:

• Wide Input Range: Supports AC 85V-265V or DC 110V-370V input, making it versatile for various grid standards.

• Compact Footprint: Ultra-small size allows for easy integration into custom PCB designs or small enclosures.

• Safety Isolation: Fully isolated input and output for safer operation.

• High Reliability: Built-in temperature protection, over-current protection, and short-circuit protection.

• Stable Output: High efficiency with low output ripple and noise (<60mV).

Technical Specifications:

Applications:

• Powering Raspberry Pi, Arduino, or ESP8266/ESP32 directly from mains.

• Smart home automation devices.

• Industrial control equipment.

• LED drive power.

• DIY electronics power supply repair.

Package Includes:

• 1 x AC-DC Step Down Module (Selected Voltage Variant)