Datasheet Analog Devices LT3573EMSE#PBF

LT3573
Isolated Flyback Converter
without an Opto-Coupler
FEATURES DESCRIPTION 3V to 40V Input Voltage Range
1.25A, 60V Integrated NPN 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
NPN Driver
n Programmable Soft-Start
n Programmable Power Switch Current Limit
n Thermally Enhanced 16-Lead MSOP The LT®3573 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third
winding or opto-isolator is required for regulation. The
part senses the isolated output voltage directly from the
primary-side flyback waveform. A 1.25A, 60V NPN power
switch is integrated along with all control logic into a
16‑lead MSOP package. n n n n The LT3573 operates with input supply voltages from
3V to 40V, and can deliver output power up to 7W with
no external power devices.The LT3573 utilizes boundary
mode operation to provide a small magnetic solution with …