The **GS-R400V/2** is a high-efficiency switching voltage regulator module manufactured by STMicroelectronics (often found in legacy industrial systems). It is part of the GS-R400 series, designed to provide a stable 5V output from a higher DC input voltage. --- ### ## Technical Specifications The core electronic characteristics of the GS-R400V/2 are summarized in the table below: | Feature | Specification | | :--- | :--- | | **Input Voltage Range** | 9V to 40V DC | | **Output Voltage** | 5.1V DC (fixed) | | **Output Current** | 4A (Continuous) | | **Efficiency** | ~75% to 85% (depending on load) | | **Switching Frequency** | 100 kHz (Typical) | | **Mounting Type** | Through-hole PCB mount (Vertical) | --- ### ### Internal Electronic Components The module is a "Single-in-Line" (SIP) package that integrates several discrete electronic components into a single shielded unit: 1. **Switching Regulator IC:** The "heart" of the module, typically an L4960 or similar high-power switching controller that uses Pulse Width Modulation (PWM). 2. **Power Inductor:** Used for energy storage during the switching cycle to smooth out the current. 3. **Schottky Diode:** Acts as a freewheeling diode to provide a path for the inductor current when the main switch is off. 4. **Filter Capacitors:** Internal electrolytic or ceramic capacitors are included to reduce input and output ripple. 5. **Metal Shielding:** The module is often encased in a metal shell to minimize Electromagnetic Interference (EMI) caused by the high-frequency switching. --- ### ### Pinout Configuration The GS-R400V/2 typically features a 9-pin or 11-pin layout. The primary functional pins are: * **Input (Vi):** Unregulated DC voltage input. * **Output (Vo):** Regulated 5V output. * **Ground (GND):** Common return path. * **Inhibit:** Allows the user to turn the module ON/OFF via a logic signal. * **Sense:** Used for remote sensing to compensate for voltage drops across long PCB traces. --- ### ### Typical Application Circuit When integrating this part, external capacitors are recommended to improve stability: ```cpp // Schematic Logic Representation [Input 9-40V] --- [C_in 470uF] --- (Pin 1: Vi) (Pin 5: GND) --- [Common Ground] [Output 5V] --- [C_out 1000uF] -- (Pin 9: Vo) ``` ---