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VIPER25HD Datasheet(PDF) 1 Page - STMicroelectronics

Part No. VIPER25HD
Description  Off-line high voltage converters
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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VIPER25HD Datasheet(HTML) 1 Page - STMicroelectronics

 
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July 2010
Doc ID 15585 Rev 4
1/40
40
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
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
SO-16
DIP-7
SO16 narrow
Table 1.
Device summary
Order codes
Package
Packaging
VIPER25LN / VIPER25HN
DIP-7
Tube
VIPER25HD / VIPER25LD
SO16 narrow
Tube
VIPER25HDTR / VIPER25LDTR
Tape and reel
www.st.com


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