The **S-R97** typically refers to a high-performance **Step-Down (Buck) DC-DC Voltage Regulator module**, often used in automotive environments and DIY electronics to convert higher battery voltages (like 12V or 24V) into a stable 5V output for USB devices. Below is a breakdown of its core electronic components and technical specifications. --- ## 1. Core Component Breakdown | Component | Function | Description | | :--- | :--- | :--- | | **Main Controller IC** | Regulation | Typically a synchronous buck converter chip that manages PWM switching. | | **Solid Capacitors** | Filtering | High-quality SMD solid capacitors used to reduce ripple and ensure stable DC output. | | **Power Inductor** | Energy Storage | A shielded high-current inductor that stores energy during the switching cycle. | | **USB Interface** | Output Port | Usually equipped with a USB-A or USB-C port (depending on the specific sub-version). | | **Schottky Diode** | Protection | Provides polarity protection to prevent damage if input wires are reversed. | --- ## 2. Technical Specifications The S-R97 module is favored for its efficiency. Here are the standard operating parameters: ### Electrical Limits * **Input Voltage:** 6V to 32V DC. * **Output Voltage:** Default 5V (automatically adjusts if Fast Charge protocols like QC3.0 are triggered). * **Output Power:** Maximum 24W per port. * **Efficiency:** Up to 97% (hence the "97" in the name). ### Protection Features 1. **Overvoltage Protection (OVP):** Prevents high voltage spikes from reaching the connected device. 2. **Overcurrent Protection (OCP):** Limits current flow if the device draws too much power. 3. **Short Circuit Protection:** Shuts down the output if a short is detected. 4. **Thermal Shutdown:** Cuts power if the module exceeds safe operating temperatures. --- ## 3. Supported Charging Protocols Modern S-R97 modules include an integrated identification chip that supports several "Fast Charge" standards: * **BC1.2:** Standard battery charging. * **Qualcomm Quick Charge:** QC2.0 and QC3.0. * **MTK PE+:** 1.1 and 2.0. * **Huawei FCP:** Fast Charging Protocol. * **Samsung AFC:** Adaptive Fast Charging. --- ## 4. Wiring Diagram Representation The module usually features four main solder pads or terminals: ```text Input (+) ---- [ Fuse ] ---- [ S-R97 Module ] ---- USB Out Input (-) ------------------ [ S-R97 Module ] ---- USB Out ``` > **Note:** Always ensure the input voltage does not exceed 32V, as this can cause permanent damage to the solid capacitors and the main controller IC.