STMicroelectronics | VIPER27LN

The VIPER27LN device is an off-line converter with an 800 V rugged power section, a PWM control, two levels of over-current protection, overvoltage and overload protections, hysteretic thermal protection, soft-start and safe auto-restart after any fault condition removal. Burst mode operation and device very low consumption help to meet the standby energy saving regulations.

Advance frequency jittering reduces EMI filter cost. Brown-out function protects the switch mode power supply when the rectified input voltage level is below the normal minimum level  pecified for the system. The high voltage start-up circuit is embedded in the device.

Features:

• 800 V avalanche rugged power section
• PWM operation with frequency jittering for low EMI
• Operating frequency:
• 60 kHz for L type
• 115 kHz for H type
• Standby power < 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

Application:

• Auxiliary power supply for consumer and home equipments
• ATX auxiliary power supply
• Low / medium power AC-DC adapters
• SMPS for set-top boxes, DVD players and recorders, white goods