LT3573 - Isolated Flyback Converter without an Opto-Coupler
- 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
The LT®3573 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.
PackagingFor complete and up to date package information and drawings, please refer to our packaging page
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
|Buy Now • Request Samples|
Demo BoardsLinear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
|DC1228A||LT3573EMSE | 10V to 30VIN, 5Vout at 1A Isolated Monolithic Flyback Converter||$100.00|
- Industrial, Automotive and Medical Isolated Power Supplies
People Who Viewed This Product Also Viewed
- LT3748 - 100V Isolated Flyback Controller
- LT3575 - Isolated Flyback Converter without an Opto-Coupler
- LT8300 - 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch
- LT3574 - Isolated Flyback Converter Without an Opto-Coupler
- LT3798 - Isolated No Opto-Coupler Flyback Controller with Active PFC
- LT3511 - Monolithic High Voltage Isolated Flyback Converter
- LT3757 - Boost, Flyback, SEPIC and Inverting Controller
- LT8302 - 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch
- LT3758 - High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller
- LT8301 - 42VIN Micropower No-Opto Isolated Flyback Converter with 65V/1.2A Switch
Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.
LTspice® IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice IV: