The **KMS-5W-R/CE** is a compact, board-mountable AC/DC power supply module designed for high efficiency and reliability in small-scale electronics. It is part of the KMS series, often utilized in medical, industrial, and IoT applications due to its safety ratings and small footprint. --- ### ## Technical Specifications Below are the primary electronic characteristics of the KMS-5W-R/CE module: | Feature | Specification | | :--- | :--- | | **Output Power** | 5 Watts | | **Input Voltage Range** | 90 - 264 VAC (Universal) | | **Output Voltage** | 5 VDC (Regulated) | | **Output Current** | 1000 mA (1A) | | **Efficiency** | ~75% to 80% | | **Isolation Voltage** | 4000 VAC (Input to Output) | | **Operating Temperature** | -25°C to +70°C (with derating) | | **Certifications** | CE, Medical (IEC60601-1), UL recognized | --- ### ## Key Electronic Components & Features The module functions as a **Switched-Mode Power Supply (SMPS)** and includes several critical internal stages: 1. **Input Filtering & Protection:** * Contains an integrated EMI filter to minimize electromagnetic interference. * Includes a fuse and thermistor for overcurrent and inrush current protection. 2. **Rectification and Smoothing:** * A bridge rectifier converts the AC input to high-voltage DC, which is then smoothed by high-voltage electrolytic capacitors. 3. **PWM Controller & Switching Element:** * A Pulse Width Modulation (PWM) IC controls a MOSFET switch, which "chops" the DC voltage at high frequencies to allow for a smaller transformer size. 4. **Isolation Transformer:** * Provides galvanic isolation between the dangerous AC mains and the low-voltage DC output. The "R" in the part number often signifies reinforced insulation suitable for medical standards. 5. **Output Regulation:** * Uses an optocoupler for feedback loops, ensuring the 5V output remains stable regardless of load changes or input fluctuations. --- ### ## Physical Dimensions & Pinout This part is typically encapsulated in a plastic resin case (potting) to protect against moisture and vibration. * **Package Type:** Through-hole PCB Mount. * **Dimensions:** Approximately 45mm x 25mm x 21mm (may vary slightly by manufacturer). * **Pin Configuration:** Usually consists of 4 pins: * `AC (L)`: Line Input * `AC (N)`: Neutral Input * `+Vout`: 5V Positive Output * `-Vout`: Common/Ground Output --- ### ## Application Use Cases * **Medical Devices:** Due to high isolation (4000VAC) and medical safety approvals. * **IoT Gateways:** Powering microcontrollers like ESP32 or Raspberry Pi Pico that require a stable 5V source. * **Industrial Automation:** Small sensors or control logic circuits where DIN rail space is limited.