LT3512
Monolithic High Voltage
Isolated Flyback Converter
Features Description n n The LT3512 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
420mA, 150V power switch, high voltage circuitry, and
control into a high voltage 16-lead MSOP package with
four leads removed. 4.5V to 100V Input Voltage Range
Internal 420mA, 150V Power Switch
Boundary Mode Operation
No Transformer Third Winding or
Opto-Isolator Required for Regulatio Improved Primary-Side Winding Feedback
Load Regulatio V
OUT Set with Two External Resistors
n BIAS Pin for Internal Bias Supply and Power
Switch Driver
n No External Start-Up Resistor
n 16-Lead MSOP Package The LT3512 operates from an input voltage range of 4.5V
to 100V and delivers up to 4.5W 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 …