VIPER27 Datasheet, PDF (1/31 Pages) STMicroelectronics – Off-line high voltage converters

VIPER27
Off-line high voltage converters
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
SO16 narrow
SO 16
Description
DIP-7
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.
Figure 1. Typical topology
+
DC input high voltage
wide range
-
+
DC Output voltage
-
DRAIN DRAIN
BR
VIPER27
GND VDD CONT FB
Table 1. Device summary
Order codes
VIPER27LN / VIPER27HN
VIPER27HD / VIPER27LD
VIPER27HDTR / VIPER27LDTR
July 2010
Package
DIP-7
SO16 narrow
Doc ID 15133 Rev 5
Packaging
Tube
Tape and reel
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