LT3511 Monolithic High Voltage Isolated Flyback Converter FEATURES DESCRIPTION n 4.5V to 100V Input Voltage Range The LT 3511 is a high voltage monolithic switching regula- n Internal 240mA, 150V Power Switch tor specifically designed for the isolated yback topology. n Boundary Mode Operation No third winding or opto-isolator is required for regula- n No Transformer Third Winding or tion as the part senses output voltage directly from the Opto-Isolator Required for Regulation primary-side yback waveform. The device integrates a n Improved Primary-Side Winding Feedback 240mA, 150V power switch, high voltage circuitry, and Load Regulation control into a high voltage 16-lead MSOP package with n V Set with Two External Resistors four leads removed. OUT n BIAS Pin for Internal Bias Supply and Power The LT3511 operates from an input voltage range of 4.5V Switch Driver to 100V and delivers up to 2.5W of isolated output power. n No External Start-Up Resistor Two external resistors and the transformer turns ratio n 16-Lead MSOP Package easily set the output voltage. Off-the-shelf transformers are available for several applications. The high level of integration and the use of boundary mode operation results APPLICATIONS in a simple, clean, tightly regulated application solution to n Isolated Telecom Power Supplies the traditionally tough problem of isolated power delivery. n Isolated Auxiliary/Housekeeping Power Supplies L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks n Isolated Industrial, Automotive and Medical Power and No R is a trademark of Linear Technology Corporation. All other trademarks are the SENSE property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522. Supplies TYPICAL APPLICATION 48V to 5V Isolated Flyback Converter Output Load and Line Regulation 5.25 V + IN V OUT 5.20 36V TO 72V 4:1 5V 1F 1M 0.3A V t 5.15 IN EN/UVLO 300H 19H 22F 5.10 t 43.2k V = 48V IN V = 36V 169k IN LT3511 V OUT 5.05 R FB R 5.00 REF 10k 4.95 V = 72V IN 4.90 T C SW VC GND BIAS 4.85 4.80 69.8k 16.9k 4.75 3.3nF 4.7F 0 50 100 150 200 250 300 3511 TA01a LOAD CURRENT (mA) 3511 TA01b 3511fc 1 V (V) OUTLT3511 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW SW (Note 4) ............................................................150V EN/UVLO 1 16 SW V , EN/UVLO, R .................................................. 100V IN FB V 3 14 R IN FB V to R .................................................................. 6V IN FB GND 5 12 R REF BIAS ................................................Lesser of 20V or V IN 6 BIAS 11 T C NC 7 10 VC R , T , VC ................................................................6V REF C 8 GND 9 GND Operating Junction Temperature Range (Note 2) MS PACKAGE 16(12)-LEAD PLASTIC MSOP LT3511E, LT3511I ............................... 40C to 125C = 90C/W JA LT3511H ............................................. 40C to 150C LT3511MP .......................................... 55C to 150C Storage Temperature Range .................. 65C to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3511EMS PBF LT3511EMS TRPBF 3511 16-Lead Plastic MSOP 40C to 125C LT3511IMS PBF LT3511IMS TRPBF 3511 16-Lead Plastic MSOP 40C to 125C LT3511HMS PBF LT3511HMS TRPBF 3511 16-Lead Plastic MSOP 40C to 150C LT3511MPMS PBF LT3511MPMS TRPBF 3511 16-Lead Plastic MSOP 55C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: