VIPER27L

The features of the VIPER27 converter include: - 800 V avalanche rugged power section - PWM operation with frequency jittering for low EMI - Operating frequency of 60 kHz for L type and 115 kHz for H type - Standby power less than 50 mW at 265 Vac - Limiting current with adjustable set point - Adjustable and accurate overvoltage protection - On-board soft-start - Safe auto-restart after a fault condition - Hysteretic thermal shutdown VIPER27 is a high-performance low-voltage PWM controller chip with an 800 V, avalanche rugged Power section. The controller includes various features such as the oscillator with jittering feature, start-up circuits with soft-start feature, PWM logic, current limit circuit with adjustable set point, second over current circuit, burst mode management, brown-out circuit, UVLO circuit, auto-restart circuit, and thermal protection circuit .

The purpose of the VIPER27 converter in consumer and home equipment is to serve as an auxiliary power supply. It is specifically designed for applications such as ATX auxiliary power supply, low/medium power AC-DC adapters, and SMPS for set-top boxes, DVD players, recorders, and white goods. The VIPER27 converter features an 800 V rugged power section, PWM operation with frequency jittering for low EMI, adjustable overvoltage protection, standby power consumption of less than 50 mW at 265 Vac, and safe auto-restart after a fault condition. Additionally, it offers limiting current with an adjustable set point, on-board soft-start, and hysteretic thermal shutdown for added safety and protection.

The operating frequency of the VIPER27 converter is 60 kHz for the L type and 115 kHz for the H type.