Features

• 800 V avalanche rugged power section

• Quasi-resonant (QR) control for valley switching operation

• 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

• Adapters for PDA, camcorders, shavers, cellular phones, cordless phones,

videogames

• Auxiliary power supply for LCD/PDP TV, monitors, audio systems, computer,

industrial systems, LED driver, No el-cap LED driver, utility power meter

• SMPS for set-top boxes, DVD players andrecorders, white goods

Description

VIPER25 is an off-line converter with an 800 V rugged power section, a PWM

control, double levels of overcurrent 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 helps to meet the

standby energy saving regulations. The quasiresonant feature reduces EMI filter

cost. Brownout and brown-in 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.

Figure 1. Typical topology

Product status link

VIPER25

Product label

Off-line high voltage converters

VIPER25

Datasheet

DS6205 - Rev 5 - February 2022

For further information contact your local STMicroelectronics sales office.