Products
LT3837
PRODUCTIONIsolated No-Opto Synchronous Flyback Controller
- Part Models
- 4
- 1ku List Price
- Starting From $4.28
Viewing:
Overview
- Senses Output Voltage Directly from Primary Side Winding—No Optoisolator Required
- Synchronous Driver for High Efficiency
- Supply Voltage Range 4.5V to 20V
- Accurate Regulation Without User Trims
- Programmable Switching Frequency from 50kHz to 250kHz
- Synchronizable
- Load Compensation
- Undervoltage Lockout
- Available in a Thermally Enhanced 16-Lead TSSOP Package
The LT3837 is an isolated switching regulator controller designed for medium power flyback topologies. A typical application is 10W to 60W with the part powered from a DC supply.
The LT3837 is a current mode controller that regulates an output voltage based on sensing the secondary voltage via a transformer winding during flyback. This allows for tight output regulation without the use of an optoisolator, improving dynamic response and reliability. Synchronous rectification increases converter efficiency and improves output cross regulation in multiple output converters.
The LT3837 operates in forced continuous conduction mode which improves cross regulation in multiple winding applications. Switching frequency is user programmable and can be externally synchronized. The part also has load compensation, undervoltage lockout and soft-start circuitry.
The LT3837 is available in a thermally enhanced 16-pin TSSOP package.
Applications
- Isolated Medium Power (10W to 60W) Supplies
- Instrumentation Power Supplies
- Isolated Medical Supplies
Documentation
Data Sheet 1
User Guide 4
Design Note 2
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 |
|---|---|---|---|
| LT3837EFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3837EFE#TRPBF | 16-Lead TSSOP w/ EP | ||
| LT3837IFE#PBF | 16-Lead TSSOP w/ EP | ||
| LT3837IFE#TRPBF | 16-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 |
||
| LT3837EFE#PBF | PRODUCTION | |
| LT3837EFE#TRPBF | PRODUCTION | |
| LT3837IFE#PBF | PRODUCTION | |
| LT3837IFE#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LT3837
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
LT3837EFE Demo Board | 9V ≤ VIN ≤ 36V, VOUT: 5V/2A, 3.3V/3A, 2.5V/3A
Resources
LT3837EFE | 9V to 36V input to 5V at 7A Synchronous Flyback Converter
Resources
LT3837EFE | 9V to 36V input to 12V at 3A Synchronous Flyback Converter
Resources
LT3837EFE | 9V to 36V input to 3.3V at 10A Synchronous Flyback Converter