The **VIPER06L** is a high-performance, high-voltage offline converter belonging to the VIPerPlus family by STMicroelectronics. It is specifically designed for SMPS (Switched Mode Power Supplies) and is widely used in low-power applications like home appliances and adapters. --- ### 1. Key Internal Components The VIPER06L integrates several discrete electronic functions into a single 8-pin package: | Component | Description | | :--- | :--- | | **Power MOSFET** | An 800V avalanche-rugged power MOSFET that handles high voltage switching. | | **PWM Controller** | A pulse-width modulation controller that regulates the output power. | | **High Voltage Start-up** | Built-in circuitry that allows the chip to start directly from the rectified mains. | | **SenseFET** | Used for accurate current sensing without needing an external sense resistor. | | **Error Amplifier** | An integrated transconductance error amplifier for feedback regulation. | --- ### 2. Technical Specifications The "L" in VIPER06L typically refers to the fixed switching frequency. Below are the primary electrical characteristics: * **Drain-Source Voltage ($V_{DSS}$):** 800 V (allows for safe operation with universal mains). * **Switching Frequency ($F_{OSC}$):** 60 kHz (fixed). * **Drain Current ($I_{DLIM}$):** 0.5 A (Internal current limit). * **Supply Voltage ($V_{DD}$):** 11.5 V to 23.5 V range. * **Standby Power:** Extremely low consumption (< 30 mW at 265 $V_{AC}$ in no-load conditions). --- ### 3. Pinout Configuration The device is commonly found in **SO16N** or **DIP-7** packages. | Pin Name | Function | | :--- | :--- | | **GND** | Ground and source of the internal MOSFET. | | **VCC** | Supply voltage for the internal control logic. | | **DRAIN** | High voltage drain connection for the MOSFET. | | **FB** | Feedback input for regulation. | | **COMP** | Compensation pin for the feedback loop. | | **LIM** | (Optional) Current limit set point adjustment. | --- ### 4. Protection Features The VIPER06L is highly robust due to its embedded protection suite: 1. **Hysteretic Thermal Shutdown:** Shuts down the IC if it overheats (> 150°C). 2. **Overload Protection (OLP):** Protects the circuit if the output is shorted. 3. **Auto-Restart:** Automatically attempts to restart after a fault condition is cleared. 4. **Soft-Start:** Reduces stress on components during initial power-up. --- ### 5. Typical Application Circuit The VIPER06L is versatile and can be used in **Flyback** or **Buck** converter topologies. ```mermaid graph LR AC_Input --> Bridge_Rectifier Bridge_Rectifier --> Bulk_Capacitor Bulk_Capacitor --> VIPER06L_Drain VIPER06L_FB --> Optocoupler Optocoupler --> Secondary_Output ```