VIPER28LN datasheet(1/29 Pages) STMICROELECTRONICS

Il numero della parte	VIPER28LN

Spiegazioni elettronici	Off-line high voltage converters

PDF	29 Pages

Scroll/Zoom	100%

Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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1 / 29 page

September 2008

Rev 1

1/29

29

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

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

DIP-7

DC input high voltage

wide range

-

+

DC Output voltage

-

+

VIPER28

DRAIN DRAIN

EPT

VDD

CONT

FB

GND

Table 1.

Device summary

Order codes

Package

Packaging

VIPER28LN

DIP-7

Tube

VIPER28HN

www.st.com

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