DESCRIPTION
The LT3512 is a high voltage monolithic switching regula
tor specifically designed for the isolated flyback topology.
No third winding or opto-isolator is required for regula
tion 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.

FEATURES
4.5V to 100V Input Voltage Range
Internal 420mA, 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
Isolated Telecom Power Supplies
Isolated Auxiliary/Housekeeping Power Supplies
Isolated Industrial, Automotive and Medical Power Supplies