The **VIPER06XSTR** is a high-performance, offline power converter part of the VIPerPlus family from STMicroelectronics. It is specifically designed for small, efficient, and low-cost switched-mode power supplies (SMPS). --- ## 1. Core Architecture The VIPER06XSTR is an "all-in-one" solution that integrates a **PWM controller** and an **800V Power MOSFET** in a single package (typically SSOP10). ### Internal Components: | Component | Function | | :--- | :--- | | **800V MOSFET** | Handles high-voltage switching and provides high robustness against surges. | | **PWM Controller** | Manages the duty cycle to maintain stable output voltage. | | **High Voltage Start-up** | Allows the chip to power itself directly from the rectified mains, eliminating the need for an external start-up resistor. | | **Error Amplifier** | Integrated 1.2V reference for precise voltage regulation. | --- ## 2. Technical Specifications The "X" in the part number specifically denotes the fixed switching frequency. | Parameter | Specification | | :--- | :--- | | **Switching Frequency** | 60 kHz (Fixed) | | **Drain-Source Voltage ($V_{DSS}$)** | 800 V | | **$R_{DS(on)}$** | 32 $\Omega$ (Typical) | | **Operating Supply ($V_{CC}$)** | 11.5 V to 23.5 V | | **Max Output Power** | ~8W (Wide range) / ~12W (European range) | | **Package** | SSOP10 (Tape and Reel) | --- ## 3. Key Features & Benefits * **Jittered Frequency:** The switching frequency is slightly modulated to spread the energy of the harmonics, significantly reducing **EMI (Electro-Magnetic Interference)**. * **Burst Mode Operation:** During light load or no-load conditions, the device enters "Burst Mode" to minimize power consumption (typically < 30mW at 265VAC). * **Safety Protections:** * **Hysteretic Over-Temperature Protection:** Shuts down if the chip gets too hot. * **Over-Current Protection (OCP):** Limits the peak current through the MOSFET. * **Over-Voltage Protection (OVP):** Protects the secondary circuit from voltage spikes. --- ## 4. Typical Application Circuit The VIPER06XSTR is commonly used in **Flyback** or **Buck** converter topologies. Below is a conceptual representation of its integration: ```text AC Input -> Bridge Rectifier -> Bulk Capacitor -> [VIPER06XSTR] -> Transformer/Inductor -> DC Output | Feedback Loop (Optocoupler) ``` ### Applications: * Power supplies for home appliances (washers, fridges). * LED lighting drivers. * Adapters for tablets and smartphones. * Auxiliary power supplies for industrial equipment.