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reference designViper27LN

STMicroelectronics Viper27LN

Off-line high voltage converters

Overview

TopologyFlyback Converter
Input voltage90-265 V
Switching frequency54-66 kHz
Output 15 V / 2.4 A
IC revision5

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 andoverload protections, hysteretic thermal protection, soft-start and safe auto-restart after any fault condition removal. Burst mode operationand 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 ower supply when the rectified input voltagelevel is below the normal minimum level specified for the system. The high voltage start-up circuit is embedded in the device.

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

Typical applications

  • SMPS for set-top boxes, DVD players and recorders, white goods
  • Auxiliary power supply for consumer and home equipments ,Low / medium power AC-DC adapters
  • ATX auxiliary power supply

More information

Parts approved by STMicroelectronics

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Product series
VIN
VOut1(V)
IOut1(A)
Vaux(V)
VT(V (AC))
fswitch(kHz)
L(mH)
NPRI : NSEC : NAUX
L(mm)
W(mm)
H(mm)
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750871111
SPECWE-OLSTM Offline Flyback Transformers, 85 - 272 V (AC), 5 V

PCN pending

Due to a pending PCN there will be a new datasheet revision issued for this order code soon. Please find the actual as well based on valid PCN date the new revision datasheet below. If you have further questions please get in contact with our sales staff.

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Downloads11 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-OLSTM Offline Flyback Transformers
Input Voltage 85 - 272 V (AC)
Output Voltage 15 V
Output Current 12.4 A
Auxiliary Voltage12 V
Insulation Test Voltage4000 V (AC)
Switching Frequency 60
Inductance1.7 mH
Turns Ratio13.9:1:2.6 
Length21 mm
Width25 mm
Height16 mm
MountTHT 
SizeEE20/10/6 
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