The **NET-50C** is a triple-output, 50W AC/DC switching power supply manufactured by Mean Well. It is widely used in industrial automation, telecommunications, and networking equipment due to its compact size and high reliability. --- ### 1. Key Technical Specifications The NET-50C is designed to convert universal AC input into three distinct DC voltage rails to power different parts of an electronic system (e.g., logic circuits, sensors, and motors). | Parameter | Specification | | :--- | :--- | | **Total Rated Power** | 50 Watts | | **Input Voltage Range** | 85 ~ 264 VAC / 120 ~ 370 VDC | | **Output 1 (V1)** | +5V DC / 0.5A to 5.0A | | **Output 2 (V2)** | +15V DC / 0.1A to 1.5A | | **Output 3 (V3)** | -15V DC / 0.1A to 0.5A | | **Efficiency** | 72% (Typical) | | **Cooling** | Free air convection | --- ### 2. Electronic Protection Features The internal circuitry includes several safety mechanisms to protect both the power supply and the connected load: * **Overload Protection:** Usually triggers at 110% - 150% of rated output power. It uses a "hiccup mode" that recovers automatically after the fault condition is removed. * **Overvoltage Protection:** Specifically monitors the +5V rail (CH1). If the voltage exceeds approximately 5.75V - 6.75V, the unit shuts down to prevent frying sensitive logic chips. * **Short Circuit Protection:** Protects the components from damage if the output wires are crossed. --- ### 3. Physical Layout & Components The device is built on an open-frame or partially enclosed metal chassis. Significant internal electronic parts include: 1. **Input Filter (EMI Filter):** A combination of capacitors and inductors to prevent electromagnetic interference from leaking back into the power grid. 2. **Bridge Rectifier:** Converts the incoming AC sine wave into a pulsating DC voltage. 3. **Electrolytic Capacitors:** Large bulk capacitors (high voltage) used for smoothing the rectified DC and filtering the output rails. 4. **Switching Transformer:** The core component that provides galvanic isolation and steps down the high-voltage DC to the required lower voltages. 5. **PWM Controller IC:** The "brain" that regulates the switching frequency to maintain stable output voltages despite fluctuations in load or input. --- ### 4. Wiring and Pin Assignment The terminal block is usually labeled as follows: | Pin No. | Assignment | Description | | :--- | :--- | :--- | | 1 | AC/L | AC Line (Hot) | | 2 | AC/N | AC Neutral | | 3 | FG | Frame Ground (Safety Earth) | | 4 | V3 | -15V Output | | 5 | V2 | +15V Output | | 6 | COM | Common Ground (Return) | | 7 | V1 | +5V Output | ---