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LT3748 Datasheet(PDF) 1 Page - Linear Technology |
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LT3748 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 30 page  LT3748 1 3748fa FEATURES APPLICATIONS DESCRIPTION 100V Isolated Flyback Controller The LT®3748 is a switching regulator controller specifically designed for the isolated flyback topology and capable of high power. It drives a low side external N-channel power MOSFET from an internally regulated 7V supply. No third winding or opto-isolator is required for regulation as the part senses the isolated output voltage directly from the primary-side flyback waveform. The LT3748 utilizes boundary mode to provide a small magnetic solution without compromising load regulation. Operating frequency is set by load current and transformer magnetizing inductance. The gate drive of the LT3748 combined with a suitable external MOSFET allow it to deliver load power up to several tens of watts from input voltages as high as 100V. The LT3748 is available in a high voltage 16-lead MSOP package with four leads removed. 25W, 12V Output, Isolated Telecom Supply n 5V to 100V Input Voltage Range n 1.9A Average Gate Drive Source and Sink Current n Boundary Mode Operation n No Transformer Third Winding or Opto-Isolator Required for Regulation n Primary-Side Winding Feedback Load Regulation n VOUT Set with Two External Resistors n INTVCC Pin for Control of Gate Driver Voltage n Programmable Soft Start n Programmable Undervoltage Lockout n Available in MSOP Package n Isolated Telecom Converters n High Power Automotive Supplies n Isolated Industrial Power Supplies Output Load and Line Regulation TYPICAL APPLICATION L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5438499 and 7471522. EN/UVLO TC SS RFB RREF VC GND INTVCC LT3748 3748 TA01a 56.2k 2nF VIN 36V TO 72V VOUT + 12V 2A VOUT – VIN 4:1 412k 15.4k 10μF 3.8μH 60.8μH 100μF GATE SENSE 4700pF 4.7μF 6.04k 243k 0.033Ω 10k LOAD CURRENT (A) 0 11.4 11.6 11.8 12.0 12.2 14.4 12.6 0.5 1.0 1.5 2.0 3748 TA01b VIN = 72V VIN = 48V VIN = 36V |
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