Datasheet Linear Technology LT3511MPMS#TRPBF
Monolithic High Voltage Isolated Flyback Converter
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LT3511 Monolithic High Voltage Isolated Flyback Converter FEATURES n DESCRIPTION
The LT®3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 240mA, 150V power switch, high voltage circuitry, and control into a high voltage 16-lead MSOP package with four leads removed. The LT3511 operates from an input voltage range of 4.5V to 100V and delivers up to 2.5W of isolated output power. Two external resistors and the transformer turns ratio 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 in a simple, clean, tightly regulated application solution to the traditionally tough problem of isolated power delivery.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499, 7471522. 4.5V to 100V Input Voltage Range Internal 240mA, 150V 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 Switch Driver No External Start-Up Resistor 16-Lead MSOP Package APPLICATIONS n Isolated Telecom Power Supplies Isolated Auxiliary/Housekeeping Power Supplies Isolated Industrial, Automotive and Medical Power Supplies TYPICAL APPLICATION
48V to 5V Isolated Flyback Converter
VIN 36V TO 72V 1F 1M EN/UVLO 43.2k LT3511 RFB RREF 10k TC VC 69.8k SW GND BIAS 16.9k 3.3nF
3511 TA01a Output Load and Line Regulation
VOUT+ 5V 0.3A 19H 22F 4:1 VIN 300H 169k 5.20 5.15 5.10 VOUT (V) 5.05 5.00 4.95 4.90 4.85 4.80 VIN = 72V VIN = 48V VIN = 36V VOUT 4.7F 4.75 0 50 150 200 100 LOAD CURRENT (mA) 250 300 3511 TA01b 3511fc 1 LT3511 ABSOLUTE MAXIMUM RATINGS
(Note 1) PIN CONFIGURATION
TOP VIEW EN/UVLO 1 VIN 3 GND BIAS NC GND 5 6 7 8 16 SW 14 RFB 12 11 10 9 RREF TC VC GND SW (Note 4) .150V VIN, EN/UVLO, RFB .100V VIN to RFB .±6V BIAS .Lesser of 20V or VIN RREF, TC, VC .6V Operating Junction Temperature Range (Note 2) LT3511E, LT3511I . 40°C to 125°C LT3511H . 40°C to 150°C LT3511MP . 55°C to 150°C Storage Temperature Range . 65°C to 150°C MS PACKAGE 16(12)-LEAD PL ...
Power Management > Switching Regulator > Flyback, Forward and Isolated Controllers
Other Names: LT3511MPMSTRPBF, LT3511MPMS TRPBF
Docket:LT3511 Monolithic High Voltage Isolated Flyback Converter FEATURES n DESCRIPTION
The LT®3511 is a high voltage monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or opto-isolator is required for regulation as the part senses output voltage directly from the primary-side flyback waveform. The device integrates a 2...