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Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters

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LT8311MPFE#PBF General Description

The LT8311 is used on the secondary side of a forward converter to provide synchronous MOSFET control and output voltage feedback through an opto-coupler. The LT8311’s unique preactive mode allows control of the secondary-side MOSFETs without requiring a traditional pulse transformer for primary- to secondary-side communication. In preactive mode, the output inductor current operates in discontinuous conduction mode (DCM) at light load. If forced continuous mode (FCM) operation is desired at light load, the LT8311 can, alternatively, be used in SYNC mode, where a pulse transformer is required to send synchronous control signals from the primary-side IC to the LT8311.

Analog Devices, Inc Inventory

Key Features

  • Wide Input Supply Range: 3.7V to 30V
  • Preactive Mode:
    • No Pulse Transformer Required
    • DCM Operation at Light Load
  • SYNC Mode:
    • FCM or DCM Operation at Light Load
    • Achieves Highest Efficiency
  • 1.5% Feedback Voltage Reference
  • 10mA Opto-Coupler Driver
  • Output Power Good Indicator
  • Integrated Soft-Start Function
Analog Devices, Inc Original Stock


  • Offline and HV Car Battery Isolated Power Supplies
  • 48V Isolated Power Supplies
  • Industrial, Automotive and Military Systems
Analog Devices, Inc Inventory


model LT8311MPFE#PBF package 20-Lead TSSOP w/ EP
packingQty Tube,74 packingOption Tube
packageType 05-08-1924 rohs roHSY
lifeCycle production tempRange -55 to 125C
Manufacturer Analog Devices Inc. Product Category AC/DC Converters
RoHS Details Series LT8311
Brand Analog Devices Product Type AC/DC Converters
Factory Pack Quantity 74 Subcategory PMIC - Power Management ICs
Unit Weight 0.009524 oz

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LT8311MPFE#PBF Datasheet PDF

Preliminary Specification LT8311MPFE#PBF PDF Download

LT8311MPFE#PBF PDF Preview

Availability: 5363 PCS

Qty. Unit Price(USD) Ext. Price
1+ $16.495 $16.50
200+ $6.383 $1,276.60
500+ $6.160 $3,080.00
1000+ $6.050 $6,050.00

The prices below are for reference only.