## Overview of the VIPER06LN The **VIPER06LN** is a high-performance offline converter specifically designed for SMPS (Switched-Mode Power Supplies). It belongs to the **VIPerPlus** family by STMicroelectronics. This IC integrates an 800 V avalanche-rugged power MOSFET with PWM current-mode control. --- ### Key Specifications | Feature | Specification | | :--- | :--- | | **Drain-Source Voltage ($V_{DSS}$)** | 800 V | | **RDS(on)** | 32 $\Omega$ (typical) | | **Switching Frequency** | 60 kHz (Fixed) | | **Output Power** | Up to 7W (Wide range) / 10W (European range) | | **Package** | DIP-7 | --- ### Internal Electronic Components The VIPER06LN is an "Integrated Circuit" because it combines several functional stages into a single silicon chip: 1. **Power MOSFET**: An 800 V rugged transistor that handles the high-voltage switching. 2. **PWM Controller**: Manages the pulse-width modulation to regulate the output voltage. 3. **High Voltage Startup**: Includes an internal high-voltage current source, eliminating the need for external startup resistors. 4. **SenseFET**: A specialized structure to monitor the current flowing through the MOSFET without needing a high-power external sense resistor. 5. **Protection Circuits**: Includes thermal shutdown, overcurrent protection (OCP), and overvoltage protection (OVP). --- ### Pin Configuration (DIP-7) | Pin Number | Name | Description | | :--- | :--- | :--- | | 1 | **GND** | Ground and source of the internal MOSFET. | | 2 | **VCC** | Supply voltage for the internal control logic. | | 3 | **CONT** | Control pin for setting the current limit. | | 4 | **FB** | Feedback input for regulation loop (usually via optocoupler). | | 5-8 | **DRAIN** | High voltage drain of the MOSFET; also used for heat dissipation. | --- ### Distinctive Features * **Jittering**: The switching frequency is slightly modulated (frequency jittering) to reduce EMI (Electromagnetic Interference) emissions. * **Burst Mode Operation**: Under light load conditions, the IC enters burst mode to minimize power consumption (less than 30 mW at no load). * **Safe Auto-Restart**: In case of a fault (like a short circuit), the device attempts to restart periodically rather than staying off or burning out. ---