LTC3765
RECOMMENDED FOR NEW DESIGNSActive Clamp Forward Controller and Gate Driver
- Part Models
- 8
- 1ku List Price
- Starting From $3.90
Overview
- Supports Self-Starting Secondary-Side Control
- Direct Flux Limit™ Guarantees No Saturation
- Active Clamp Drive with Delay Adjustment
- On-Chip Bridge Rectifier Eliminates Need for Separate Gate Drive Bias Supply
- Wide Input Supply Range: 8V and Up (Limited Only by External Components)
- Linear Regulator Controller for Fast Start-Up
- High Speed Gate Drivers
- Precision UVLO with Adjustable Hysteresis
- Overcurrent Protection
- Overtemperature Protection
- Adjustable Start-Up Frequency and Soft-Start
- Tiny 16-Lead MSOP Package
The LTC3765 is a start-up controller and gate driver for use in a self-starting secondary-side control forward converter. When combined with the LTC3766 secondary-side synchronous forward controller, a complete isolated power supply is created using a minimum of discrete parts. A proprietary scheme is used to multiplex gate drive signals and bias power across the isolation barrier through a small pulse transformer. The LTC3765 contains an onchip bridge rectifier that extracts gate drive bias power from this pulse transformer, eliminating the need for a separate bias supply. A precision undervoltage lockout circuit and linear regulator controller ensure a quick and well-controlled start-up.
The LTC3765 includes an active clamp output for driving an external PMOS, as well as an adjustable delay to optimize efficiency. The active clamp architecture reduces voltage stress on the main power switch, and provides the highest possible efficiency. Overcurrent protection and the Direct Flux Limit guarantee no transformer saturation without compromising transient response.
Applications
- Isolated Battery Chargers
- Isolated 48V Telecommunication Systems
- Servers and Embedded Computing
- Automotive and Heavy Equipment
Documentation
Data Sheet 1
User Guide 5
Video 1
Product Selector Card 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 |
|---|---|---|---|
| LTC3765EMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3765EMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3765HMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3765HMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3765IMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3765IMSE#TRPBF | 16-Lead MSOP w/ EP | ||
| LTC3765MPMSE#PBF | 16-Lead MSOP w/ EP | ||
| LTC3765MPMSE#TRPBF | 16-Lead MSOP w/ EP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3765EMSE#PBF | PRODUCTION | |
| LTC3765EMSE#TRPBF | PRODUCTION | |
|
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2) |
||
| LTC3765EMSE#PBF | PRODUCTION | |
| LTC3765EMSE#TRPBF | PRODUCTION | |
| LTC3765HMSE#PBF | PRODUCTION | |
| LTC3765HMSE#TRPBF | PRODUCTION | |
| LTC3765IMSE#PBF | PRODUCTION | |
| LTC3765IMSE#TRPBF | PRODUCTION | |
| LTC3765MPMSE#PBF | PRODUCTION | |
| LTC3765MPMSE#TRPBF | PRODUCTION | |
|
Feb 4, 2020 - 20_0132 Laser Top Mark for 16-Lead MSOP Packages Assembled in ADPG and UTAC |
||
| LTC3765EMSE#PBF | PRODUCTION | |
| LTC3765EMSE#TRPBF | PRODUCTION | |
| LTC3765HMSE#PBF | PRODUCTION | |
| LTC3765HMSE#TRPBF | PRODUCTION | |
| LTC3765IMSE#PBF | PRODUCTION | |
| LTC3765IMSE#TRPBF | PRODUCTION | |
| LTC3765MPMSE#PBF | PRODUCTION | |
| LTC3765MPMSE#TRPBF | PRODUCTION | |
|
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper |
||
| LTC3765HMSE#PBF | PRODUCTION | |
| LTC3765HMSE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice 4
- LTC3765/LTC3766 Demo Circuit - Active Clamp Forward Converter (36-60V to 24V @ 15A)
- LTC3765/LTC3766 Demo Circuit - Active Clamp Forward Converter (36-60V to 12V @ 30A)
- LTC3765/LTC3766 Demo Circuit - Active Clamp Forward Converter (18-72V to 12V @ 12.5A)
- LTC3765/LTC3766 Demo Circuit - 120W Isolated Forward Converter with Synchronous Rectification (9-36V to 12V @ 10A)
Models for the following parts are available in LTspice:
- LTC3765
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
LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 36V ≤ VIN ≤ 60V; VOUT = 12V @ 30A
Resources
LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter with Sync Rectification, 36V ≤ VIN ≤ 60V; VOUT = 24V @ 15A
Resources
LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 18V ≤ VIN ≤ 72V; VOUT = 12V @ 12.5A
Resources
LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 10A
Resources
LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter with Sync Rectification, 36V ≤ VIN ≤ 60V; VOUT = 56V @ 5.4A
Resources
LTC3765EMSE/LTC3766EGN Isolated Demo Board | Forward Converter, 9V ≤ VIN ≤ 36V; VOUT = 12V @ 10A