Overview
The VIPER06LSTR is a monolithic IC designed for off-line switch-mode power supplies (SMPS). As part of STMicroelectronics' VIPerPlus family, it integrates an 800V avalanche-rugged power MOSFET with a current-mode PWM controller. This all-in-one solution eliminates the need for external switching components, making it ideal for space-constrained applications. The device operates with a fixed 60kHz switching frequency and includes comprehensive protection features. Its primary market includes OEMs manufacturing power adapters, home appliances, and industrial control systems requiring compact, efficient power conversion below 6W.
Structure and Working Principle
The VIPER06LSTR combines four key functional blocks: the high-voltage startup circuit, PWM controller, power MOSFET, and protection circuitry. The startup circuit enables direct connection to rectified mains voltage (85-265V AC), while the internal oscillator drives the power stage at fixed frequency. During operation, the current-mode control adjusts duty cycle based on feedback from the auxiliary winding or optocoupler. The integrated 800V MOSFET handles line voltage switching with avalanche capability, while thermal shutdown and overload protection circuits ensure safe operation under fault conditions.
Key Features
Primary features include ultra-low standby power consumption (<30mW at 230V AC), pulse-by-pulse current limiting, and automatic restart protection. The device's high integration reduces BOM count by eliminating external components like startup resistors and MOSFET gate drivers. Notably, the VIPER06LSTR maintains stable operation across -40°C to +150°C junction temperatures. The SO-8 package offers creepage distance compliance for reinforced insulation requirements, while the Eco-mode operation minimizes audible noise in light-load conditions.
Application Areas
Common applications include USB chargers, smart home device power supplies, and industrial sensor modules. The IC's compact footprint makes it suitable for space-sensitive designs like IoT endpoints and LED driver circuits. In white goods manufacturing, it powers control boards for refrigerators and washing machines. The automotive aftermarket utilizes these ICs for accessory power converters, though they're not AEC-Q100 qualified for primary vehicle systems.
Maintenance and Precautions
Proper PCB layout is critical - maintain adequate clearance between high-voltage tracks and use ground planes for noise reduction. Ensure sufficient copper area for heat dissipation, as the SO-8 package relies on PCB thermal conduction. When prototyping, verify transformer parameters match the IC's operating envelope. In production, implement ESD controls during handling, as the high-impedance VDD pin is sensitive to static discharge. For long-term reliability, avoid operating near maximum junction temperature in enclosed environments.
B2B Procurement Guide
Industrial buyers should specify tape-and-reel packaging (VIPER06LSTR-1) for automated assembly. Minimum order quantities typically start at 2,000 units, with price breaks at 10k and 50k quantities. Lead times average 8-12 weeks for non-stock orders. Evaluate alternative part numbers (VIPER06LN, VIPER06HN) for different package options or current ratings. Request manufacturer's Certificate of Compliance for RoHS and REACH regulations. For high-volume projects, consider engaging ST's technical support for custom transformer design assistance.
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