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VIPER27LN Datasheet(PDF) 1 Page - STMicroelectronics

Part # VIPER27LN
Description  Off-line high voltage converters
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

VIPER27LN Datasheet(HTML) 1 Page - STMicroelectronics

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July 2010
Doc ID 15133 Rev 5
1/31
31
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
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.
Figure 1.
Typical topology
DIP-7
SO 16
SO16 narrow
DC input high voltage
wide range
-
+
DC Output voltage
-
+
VIPER27
DRAIN
DRAIN
BR
VDD
CONT
FB
GND
Table 1.
Device summary
Order codes
Package
Packaging
VIPER27LN / VIPER27HN
DIP-7
Tube
VIPER27HD / VIPER27LD
SO16 narrow
VIPER27HDTR / VIPER27LDTR
Tape and reel
www.st.com


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