LT8311
LT8311
PRODUCTIONSynchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters
- Part Models
- 8
- 1ku List Price
- Starting From $4.65
Viewing:
Overview
- 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
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.
The LT8311 offers a full featured opto-coupler controller, incorporating a 1.5% reference, a transconductance error amplifier and a 10mA opto-driver. Power good monitoring and output soft-start/overshoot control are also included. The LT8311 is available in a 16-lead FE package with pins removed for high voltage spacing requirements.
Applications
- Offline and HV Car Battery Isolated Power Supplies
- 48V Isolated Power Supplies
- Industrial, Automotive and Military Systems
Documentation
Data Sheet 1
User Guide 4
Technical Articles 3
Brochure 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT8311EFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8311EFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8311HFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8311HFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8311IFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8311IFE#TRPBF | 20-Lead TSSOP w/ EP | ||
| LT8311MPFE#PBF | 20-Lead TSSOP w/ EP | ||
| LT8311MPFE#TRPBF | 20-Lead TSSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL |
||
| LT8311EFE#PBF | PRODUCTION | |
| LT8311EFE#TRPBF | PRODUCTION | |
| LT8311HFE#PBF | PRODUCTION | |
| LT8311HFE#TRPBF | PRODUCTION | |
| LT8311IFE#PBF | PRODUCTION | |
| LT8311IFE#TRPBF | PRODUCTION | |
| LT8311MPFE#PBF | PRODUCTION | |
| LT8311MPFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareTools & Simulations
LTspice 2
- LT3752/LT8311 Demo Circuit - Active Clamp Forward Converter with Synchronous Rectification (36-72V to 12V @ 12A)
- LT3752-1/LT8311 Demo Circuit - 200W Active Clamp Forward Converter with Synchronous Rectification (150-400V to 12V @ 16.7A)
Models for the following parts are available in LTspice:
- LT8311
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LT8310EFE/LT8311EFE Isolated Demo Board | 36V ≤ VIN ≤ 72V; VOUT = 12V @ 12A
Resources
LT3752IFE/LT8311IFE Demo Board | Forward Converter with Synchronous Rectification, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 13A
Resources
LT3752EFE-1/LT8311EFE Demo Board | 150V ≤ VIN ≤ 400V, VOUT = 12V @ 16.7A
Resources
LT3752EFE/LT8311EFE Isolated Demo Board | 18V ≤ VIN ≤ 72V; VOUT: 12V @ 12A