Datasheet Linear Technology LT3573IMSE#TRPBF
Isolated Flyback Converter without an Opto-Coupler
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LT3573 Isolated Flyback Converter without an Opto-Coupler FEATURES DESCRIPTION
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.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499 and 7471522. n n 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 APPLICATIONS
n Industrial, Automotive and Medical Isolated Power Supplies TYPICAL APPLICATION
5V Isolated Flyback Converter
VIN 12V TO 24V 10µF 357k SHDN/UVLO 51.1k LT3573 TC RILIM SS VC 28.7k 10k 10nF 20k 1nF
3573 TA01 Load Regulation
VIN 0.22µF 2k 24µH PMEG6010 RFB RREF 6.04k SW GND TEST BIAS
3 0 200 400 600 800 1000 1200 1400
3573 TA01b 3:1 B340A VOUT+ 5V, 0.7A 2.6µH 47µF VOUT
OUTPUT VOLTAGE ERROR (%) 3 2 1 0 1 2 VIN = 12V VIN = 24V 80.6k 4.7µF IOUT (mA) 3573fd For more information www.linear.com/LT3573 1 LT3573
(Note 1) ABSOLUTE MAXIMUM RATINGS
SW .60V VIN, SHDN/UVLO, RFB, BIAS .40V SS, VC, TC, RREF , RILIM .5V Maximum Junction Temperature . 125°C Operating Junction Temperature Range (Note 2) LT3573E . 40°C to 125°C Storage Temperature Range . 65°C to 150°C PIN CONFIGURATION
TOP VIEW GND TEST GND SW VIN BIAS SHDN/UVLO GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND TC RREF RFB VC RILIM SS GND 17 MSE PACKAGE 16-LEAD PLASTIC MSOP JA = 50°C/W, JC = 10°C/W EXPOSED PAD (PIN 17) IS GND, MUST BE CONNECTED TO GND ORDER INFORMATION
LEAD FREE FINISH LT3573EMSE#PBF LT3573IMSE#PBF TAPE AND REEL LT3573EMSE#TRPBF LT3573IMSE#TRPBF PART MARKING* 3573 3573 PACKAGE DESCRIPTION 16-Lead Plastic MSOP 16-Le ...
Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers
Other Names: LT3573IMSETRPBF, LT3573IMSE TRPBF
Docket:LT3573 Isolated Flyback Converter without an Opto-Coupler FEATURES DESCRIPTION
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 flyba...