Five-wire DC fan driver PCB designed to control paired DC inlet and outlet fans with reliable speed control and built-in protection. Key benefits - Solves compatibility gaps for internal fan panels that require DC drive, enabling both indoor and outdoor DC fans to be controlled by a single module. - Simple integration with microcontrollers or manual control, reducing wiring complexity and installation time. - Built-in interference suppression and protection features reduce disruption to nearby electronics and increase system reliability. Features and functions - Five-wire DC fan driver board for general purpose internal fan panels. - Motor speed control via on-board potentiometer or external PWM signal from a microcontroller using a 2.54-4P connector. - Two VH3.96-6P interfaces with two spare pins each, allowing independent control of two fan sets, for example inlet and outlet fans. - Integrated input EMC anti-interference, surge protection, NTC negative temperature characteristic for overrun protection, and a built-in non-isolated 15 V motor power supply. - Optimized layout for compatibility with common mass-produced fan control panels, easing replacement and retrofit. Technical specifications - PCB size: 100 x 58 mm. - Board material: double-sided FR-4, 1.6 mm thickness. - Main filter capacitor: 450 V 150 uF high-frequency capacitor with low equivalent series resistance, rated to 105 C. - Control interface: on-board potentiometer and PWM input; if using a microcontroller, share ground and 5 V VCC with the MCU. - MCU minimal wiring: only three wires required for MCU control: FG, PWM, and GND. Practical applications - HVAC systems where separate inlet and outlet DC fans need coordinated speed control in compact panels. - Air handling units and air purifiers that use DC brushless fans for efficient airflow management. - Industrial or commercial equipment cabinets that require low-noise, PWM-controlled DC fan operation with built-in EMC and surge protection. Compatibility and installation notes - Designed for internal fan panels using DC fans and for straightforward retrofit into existing mass-produced control panel layouts. - For MCU control, connect FG, PWM, and GND to the controller and share the controller 5 V supply as required. - Two independent fan outputs allow separate control of intake and exhaust fans without additional driver modules. This five-wire DC fan driver PCB provides compact, protected, and MCU-ready control of paired DC fans while maintaining compatibility with common panel designs.