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LT3573: Isolated Flyback Converter without an Opto-Coupler Data Sheet12/10/2013PDF275K
Alternative Parts
Overview
Features and Benefits
- 3V to 40V Input Voltage Range
- 1.25A, 60V Integrated NPN Power Switch
- Boundary Mode Operation
- No Transformer Third Winding or Opto-Isolator Required for Regulation
- Improved Primary-Side Winding Feedback Load Regulation
- VOUT Set with Two External Resistors
- BIAS Pin for Internal Bias Supply and Power NPN Driver
- Programmable Soft-Start
- Programmable Power Switch Current Limit
- Thermally Enhanced 16-Lead MSOP
Product Details
The LT3573 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation. The part senses the isolated output voltage directly from the primary-side flyback waveform. A 1.25A, 60V NPN power switch is integrated along with all control logic into a 16-lead MSOP package.
The LT3573 operates with input supply voltages from 3V to 40V, and can deliver output power up to 7W with no external power devices.The LT3573 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation.
Applications
- Industrial, Automotive and Medical Isolated Power Supplies
Product Categories
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 (1)
Documentation & Resources
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R530 Reliability Data3/26/2018PDF20 K
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DC1228A - Demo Manual10/29/2013PDF312K
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48V No-Opto Isolated Applications12/21/2010PDF2M
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Isolated Power Your Way1/21/2014PDF579K
Tools & Simulations
LTspice
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LTspice Simulations
Models for the following parts are available in LTspice:
LT3573
Design Resources
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PCN-PDN Information
Support & Discussions
Sample & Buy
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Evaluation Boards
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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.