VIPER27LN

1. Description

The 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 specified for the system. The high voltage start-up circuit is embedded in the device.

2. Features

   1. 800 V avalanche rugged power section

   2. PWM operation with frequency jittering for low EMI

   3. Operating frequency:

       – 60 kHz for L type

       – 115 kHz for H type

   4. Standby power < 50 mW at 265 Vac

   5. Limiting current with adjustable set point

   6. Adjustable and accurate overvoltage protection

   7. On-board soft-start

   8. Safe auto-restart after a fault condition

   9. Hysteretic thermal shutdown

3. Application

   1. Auxiliary power supply for consumer and home equipments

   2. ATX auxiliary power supply

   3. Low / medium power AC-DC adapters

   4. SMPS for set-top boxes, DVD players and recorders, white goods

4. Pin settings

5. Package dimensions