The **HWS100A-3/R** is a high-reliability, industrial-grade AC-DC single-output power supply manufactured by TDK-Lambda. This specific model is part of the HWS-A series, known for its compact size, high efficiency, and "limited lifetime warranty." --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 3.3V DC | | **Output Current** | 20A | | **Maximum Power** | 66W | | **Input Voltage Range** | 85 - 265V AC (Universal) or 120 - 370V DC | | **Efficiency** | ~82% | | **Cooling** | Convection Cooled (No fan required) | | **Mounting Type** | Chassis Mount / Enclosed | --- ### 2. Suffix Breakdown: "/R" The "R" suffix in the model name is critical for identifying specific electronic features: * **Remote On/Off (Option /R):** This model includes an additional internal circuit that allows the user to turn the power supply output on or off using an external signal without disconnecting the main AC line. This is ideal for automated systems or energy-saving standby modes. --- ### 3. Core Electronic Components & Features #### A. Input Section * **Active PFC (Power Factor Correction):** It includes active circuitry to ensure the power factor is high (typically 0.98+), complying with EN61000-3-2 standards. * **EMI Filter:** Built-in filtering to reduce conducted and radiated electromagnetic interference. #### B. Output Regulation * **Voltage Potentiometer:** Located on the front, allowing the 3.3V output to be trimmed (typically ±20%) to compensate for voltage drops in wiring. * **Over Current Protection (OCP):** Constant current limiting with automatic recovery. * **Over Voltage Protection (OVP):** Shuts down the unit if the output exceeds a safe threshold (approx. 4.0V - 5.25V). #### C. Environmental & Build Quality * **Electrolytic Capacitors:** High-quality components rated for long life at elevated temperatures. * **Dielectric Strength:** 3.0kVAC Input to Output isolation. * **Operating Temp:** Wide range from -10°C to +70°C (with derating above 50°C). --- ### 4. Typical Applications Due to its 3.3V output and high reliability, this unit is commonly found in: * **Industrial Automation:** Powering PLCs and logic controllers. * **Test & Measurement:** Providing stable power for sensitive laboratory equipment. * **Telecommunications:** Powering low-voltage digital processing boards. ---