VIPER25HN Datasheet, PDF (1/40 Pages) STMicroelectronics – Off-line high voltage converters

VIPER25
Off-line high voltage converters
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
Applications
■ 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 and
recorders, white goods
SO16 narrow
SO-16
DIP-7
Description
The device 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 quasi-
resonant feature reduces EMI filter cost. Brown-
out 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
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Table 1. Device summary
Order codes
VIPER25LN / VIPER25HN
VIPER25HD / VIPER25LD
VIPER25HDTR / VIPER25LDTR
July 2010

Package
DIP-7
SO16 narrow
Doc ID 15585 Rev 4
!-V
Packaging
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