VIPER37 datasheet(1/35 Pages) STMICROELECTRONICS

部件名	VIPER37

功能描述	VIPerPlus family: fixed frequency offline converter

PDF	35 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 35 page

February 2012

Doc ID 022218 Rev 1

1/35

35

VIPER37

VIPerPlus family: fixed frequency offline converter

Features

■ 800 V avalanche rugged power section

■ PWM operation with adjustable limiting current

■ 30 mW standby power at 265 Vac

■ Operating frequency:

– 60 kHz for L type

– 115 kHz for H type

■ Frequency jittering for low EMC

■ Output overvoltage protection

■ High primary current protection (2nd OCP)

■ Input undervoltage setting (brownout)

■ Onboard soft-start

■ Safe auto-restart after a fault condition

■ Hysteretic thermal shutdown

Applications

■ SMPS for set-top boxes, DVD players and

recorders, white goods

■ Auxiliary power supply for consumer and home

equipment

■ ATX auxiliary power supply

■ Low / medium power AC-DC adapters

Description

This device is an offline converter with an 800 V

rugged power section, a PWM control, two levels

of overcurrent protection, overvoltage and

overload protection, hysteretic thermal protection,

soft-start, and safe auto-restart after the removal

of any fault condition. Burst mode operation and

very low device consumption help to meet the

standby energy saving regulations.

Advance frequency jittering reduces EMI filter

costs. Brownout 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 startup

circuit is embedded in the device.

Figure 1.

Typical topology

SDIP10

DC input high voltage

wide range

+

DC Output voltage

-

+

VIPER37

DRAIN

DRAIN DRAIN DRAIN

BR

VDD

CONT

FB

GND

Table 1.

Device summary

Order codes

Package

Packaging

VIPER37LE

SDIP10

Tube

VIPER37HE

www.st.com

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