The **VIPER100BSP** is a high-performance, high-voltage power conversion integrated circuit (IC) developed by STMicroelectronics. It belongs to the **VIPer** (Vertical Intelligent Power) family, which integrates a dedicated PWM (Pulse Width Modulation) controller with a high-voltage Power MOSFET on the same silicon chip. --- ## 1. Key Component Overview The VIPER100BSP is designed for Off-line Switch Mode Power Supplies (SMPS). Below is a breakdown of its internal electronic structure: | Feature | Specification / Description | | :--- | :--- | | **Power MOSFET** | Integrated 700V breakdown voltage Power MOSFET. | | **Package** | PowerSO-10 (Surface Mount). | | **Switching Frequency** | Up to 200 kHz (Adjustable). | | **Current Limit** | Built-in programmable overcurrent protection. | | **Thermal Protection** | Automatic thermal shutdown at 170°C. | --- ## 2. Internal Functional Blocks The "intelligence" of the VIPER100BSP comes from the combination of these internal electronic sections: ### A. The Power Section * **Vertical MOSFET:** Capable of handling high drain-source voltages (700V), making it suitable for universal input voltages (85VAC to 270VAC). * **SenseFET:** A small portion of the MOSFET is used to sense the current flowing through the device without needing a bulky external shunt resistor. ### B. The Control Section * **PWM Controller:** Regulates the output voltage by adjusting the duty cycle based on feedback. * **Startup High Voltage Current Source:** Internally charges the $V_{DD}$ capacitor, eliminating the need for external bleed resistors and improving efficiency. * **Error Amplifier:** Compares the feedback voltage with an internal reference to maintain stability. --- ## 3. Pin Configuration (PowerSO-10) | Pin Name | Function | | :--- | :--- | | **DRAIN** | High voltage drain pin of the Power MOSFET. Provides internal bias current during startup. | | **SOURCE** | Common ground for the control and power sections. | | **VDD** | Power supply for the control circuits (usually 8V to 15V). | | **COMP** | Input for the error amplifier (Feedback loop compensation). | | **OSC** | Oscillator pin; allows setting the switching frequency with an external RC circuit. | --- ## 4. Typical Application Circuit In a standard Flyback converter, the VIPER100BSP acts as the primary switch. ```mermaid graph LR AC_Input --> Rectifier Rectifier --> Transformer_Primary Transformer_Primary --> VIPER100BSP_Drain VIPER100BSP_Source --> Ground Optocoupler --> VIPER100BSP_Comp ``` ### Advantages of using VIPER100BSP: 1. **Reduced Component Count:** Combines controller and MOSFET, reducing PCB footprint. 2. **Robustness:** Features "hiccup mode" for short-circuit protection. 3. **Low Standby Power:** Optimized for "Blue Angel" and "Energy Star" efficiency requirements. ---