VIPER28 Datasheet, PDF (1/29 Pages) STMicroelectronics – Off-line high voltage converters

VIPER28
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 over-voltage
protection
■ On-board soft-start
■ Safe auto-restart after a fault condition
■ Hysteretic thermal shutdown
■ Delayed overload protection
Application
■ Auxiliary power supply for consumer and home
equipment
■ ATX auxiliary power supply
■ Low / medium power AC-DC adapters
■ SMPS for set-top boxes, DVD players and
recorders, white goods
DIP-7
Description
The device is an off-line converter with an 800 V
rugged power section, a PWM control, two levels
of over-current protection, over-voltage 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. Advance
frequency jittering reduces EMI filter cost. The
extra power timer allows the management of
output peak power for a designed time window.
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
EPT
VIPER28
GND VDD CONT FB
Table 1.
Device summary
Order codes
VIPER28LN
VIPER28HN
September 2008
Package
DIP-7
Rev 1
Packaging
Tube
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