The **WMS2-03-R/K** is a high-performance **Step-Down (Buck) Voltage Regulator Module** designed for industrial and automotive applications where reliability and high efficiency are critical. --- ### 1. Technical Specifications The following table outlines the core electronic characteristics of the module: | Parameter | Specification | | :--- | :--- | | **Input Voltage Range** | 4.5V to 30V DC | | **Output Voltage** | 3.3V (Fixed/Standard for this series) | | **Maximum Output Current** | 2A | | **Conversion Efficiency** | Up to 92% | | **Switching Frequency** | 340 kHz (Typical) | | **Operating Temperature** | -40°C to +85°C | | **Mounting Type** | Through-hole / SIP (Single In-line Package) | --- ### 2. Key Electronic Components & Features The "R/K" variant typically denotes specific internal protections and architectural choices: * **Synchronous Rectification:** Unlike standard buck converters that use a diode, this module utilizes internal MOSFETs for rectification. This significantly reduces heat dissipation and improves efficiency. * **Built-in Protection Circuits:** * **Short Circuit Protection (SCP):** Automatically shuts down or limits current if the output pins are shorted. * **Over-Temperature Protection (OTP):** Thermal shutdown circuitry prevents the silicon from melting under extreme loads. * **Under-Voltage Lockout (UVLO):** Ensures the device only operates when the input voltage is stable enough to maintain regulation. * **Low ESR Capacitance:** The internal filtering consists of low Equivalent Series Resistance (ESR) capacitors to minimize output ripple and noise. --- ### 3. Pin Configuration The module usually follows a standard 3-pin layout, making it a "drop-in" replacement for traditional (and inefficient) linear regulators like the LM78xx series. | Pin Number | Function | Description | | :--- | :--- | :--- | | **1** | **VIN** | Positive Input Voltage | | **2** | **GND** | Common Ground | | **3** | **VOUT** | Regulated Output Voltage | --- ### 4. Typical Applications Due to its wide input range and high efficiency, it is commonly found in: * **Distributed Power Systems:** Converting 24V industrial rails down to 3.3V for microcontrollers. * **Battery Powered Equipment:** Extending battery life by reducing energy wasted as heat. * **Telecommunications:** Providing localized power to sensors and RF modules. ---