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LT3748: 100V Isolated Flyback Controller Data Sheet (Rev. D)2/25/2015PDF1 M
Alternative Parts
Overview
Features and Benefits
- 5V to 100V Input Voltage Range
- 1.9A Average Gate Drive Source and Sink Current
- Boundary Mode Operation
- No Transformer Third Winding or Opto-Isolator Required for Regulation
- Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- INTVCC Pin for Control of Gate Driver Voltage
- Programmable Soft Start
- Programmable Undervoltage Lockout
- Available in MSOP Package
- AEC-Q100 Qualified for Automotive Applications
Product Details
The LT3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform.
The LT3748 utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of the LT3748 combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V.
The LT3748 is available in a high voltage 16-lead MSOP package with four leads removed.
APPLICATIONS
- Isolated Telecom Converters
- High Power Automotive Supplies
- Isolated Industrial Power Supplies
- Military and High Temperature Applications
Product Categories
Markets and Technologies
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (4)
Documentation & Resources
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DC1557A - Demo Board10/15/2010PDF615K
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No-Opto Isolated Flyback Converters7/13/2017PDF458K
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48V No-Opto Isolated Applications12/21/2010PDF2M
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Isolated Power Your Way1/21/2014PDF579K
Tools & Simulations
LTspice
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.
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LTspice Simulations
Models for the following parts are available in LTspice:
LT3748
Product Recommendations
LT3748 Companion Parts
Design Resources
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PCN-PDN Information
Sample & Buy
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.