The **KMS-5W-R** is a series of compact, board-mountable AC-DC power supply modules typically manufactured by companies like **TDK-Lambda** (part of their Medical/Industrial KMS series). These modules are designed to convert high-voltage AC input into a stabilized low-voltage DC output. Below is a detailed breakdown of its electronic specifications and features. --- ### 1. Key Technical Specifications | Feature | Specification | |:---|:---| | **Power Rating** | 5 Watts | | **Input Voltage Range** | 90 - 264 VAC (Universal Input) | | **Input Frequency** | 47 - 440 Hz | | **Output Voltages** | Available in 3.3V, 5V, 9V, 12V, 15V, or 24V DC | | **Isolation Class** | Class II (Requires no Earth ground) | | **Safety Certifications** | IEC/EN/UL 60601-1 (Medical), 60950-1 (ITE) | | **Package Type** | PCB Mountable (Encapsulated) | --- ### 2. Core Electronic Characteristics #### A. Medical Safety Compliance One of the primary features of the "KMS" series is its certification for medical applications. - It features **2 x MOPP** (Means of Patient Protection) isolation. - It has very low leakage current, making it safe for devices that come into contact with patients. #### B. High Efficiency and Thermal Management - **Encapsulation:** The internal components are potted in a plastic case with thermally conductive resin. This protects against vibration and moisture while helping dissipate heat. - **Convection Cooled:** It does not require a fan, operating silently and reliably in enclosed environments. #### C. Protection Circuitry The module includes built-in electronic safeguards: 1. **Overcurrent Protection:** Automatically limits output if the load exceeds capacity. 2. **Short Circuit Protection:** Recovery is usually automatic (hiccup mode) once the fault is removed. 3. **Overvoltage Protection:** Prevents the output from spiking and damaging the downstream PCB components. --- ### 3. Pin Configuration (Typical) While you should always consult the specific datasheet for your variant, the footprint generally follows this logic: | Pin Number | Function | Description | |:---:|:---|:---| | 1 | AC (L) | Line Input | | 2 | AC (N) | Neutral Input | | 3 | +Vout | Positive DC Output | | 4 | -Vout | Negative DC Output (Ground) | --- ### 4. Application Areas - **Medical Equipment:** Portable monitors, dental equipment, and diagnostic tools. - **Industrial Controls:** Small PLC modules or sensors requiring a steady 5W source. - **IoT Devices:** Smart home hubs that plug directly into wall power. ---