The **SSC4S701** is a high-performance power IC designed specifically for **switching power supplies (SMPS)**. It is developed by Sanken Electric and is commonly used in LLC resonant converters, often found in high-efficiency adapters, LED TVs, and office automation equipment. --- ## 1. Key Technical Specifications The SSC4S701 integrates a controller for an LLC current-resonant circuit. Below are the primary technical parameters: | Parameter | Description | | :--- | :--- | | **Package Type** | SOIC-8 (8-pin Surface Mount) | | **Supply Voltage (Vcc)** | Typical operating range up to 35V | | **Circuit Topology** | LLC Resonant (Half-bridge control) | | **Key Function** | High-side and Low-side Driver (Built-in) | | **Protection Features** | OVP, OCP, OLP, TSD (Thermal Shutdown) | --- ## 2. Functional Features The component is designed to minimize power loss and electromagnetic interference (EMI). Its core features include: ### A. High-Efficiency Control * **Soft Switching:** It utilizes Zero Voltage Switching (ZVS) to reduce power loss in the power MOSFETs. * **Burst Mode:** During light-load conditions, the IC enters a "Burst" state to minimize standby power consumption. ### B. Integrated Protection Circuits * **Overcurrent Protection (OCP):** Monitors the current through the resonant capacitor. * **Overload Protection (OLP):** Shuts down the IC if a constant load exceeds the limit. * **Brown-out Function:** Protects the system from damage when the input AC voltage drops too low. ### C. Internal Logic The IC contains a built-in high-voltage startup circuit, which eliminates the need for external startup resistors, further reducing the total component count on the PCB. --- ## 3. Pin Configuration (SOIC-8) While specific pinouts should always be verified via the manufacturer datasheet, a typical layout for the SSC4S70x series is as follows: 1. **VCC:** Power supply input. 2. **GND:** Signal and power ground. 3. **FB:** Feedback input (Optocoupler connection). 4. **CSS:** Soft-start capacitor connection. 5. **OCP:** Overcurrent protection sensing. 6. **VB:** High-side floating supply. 7. **HO:** High-side gate driver output. 8. **VS:** High-side floating supply return. --- ## 4. Typical Applications * **LCD / LED Televisions:** Main power supply boards. * **Industrial Equipment:** High-efficiency power modules. * **Laptops:** High-wattage AC adapters. * **LED Lighting:** Large scale architectural or street lighting drivers.