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100V Isolated Flyback Controller
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LT3748
100V Isolated
Flyback Controller
Features Description 5V to 100V Input Voltage Range
nn 1.9A Average Gate Drive Source and Sink Current
nn Boundary Mode Operation
nn No Transformer Third Winding or Opto-Isolator
Required for Regulation
nn Primary-Side Winding Feedback Load Regulation
nn V
OUT Set with Two External Resistors
nn INTV
CC Pin for Control of Gate Driver Voltage
nn Programmable Soft Start
nn Programmable Undervoltage Lockout
nn Available in MSOP Package 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. nn The LT3748 utilizes boundary mode to provide a small
magnetic solution without compromising load regulation. …