LT3575 Datasheet | Linear Technology

Data Sheet.in LT3575 Isolated Flyback Converter without an Opto-Coupler Features n n n n n n n n n n DESCRIPTION The LT®3575 is a monolithic switching regulator specifically designed for the isolated flyback topology. No third winding or optoisolator is required for regulation. The part senses the isolated output voltage directly from the primary side flyback waveform. A 2.5A, 60V NPN power switch is integrated along with all control logic into a 16-lead TSSOP package. The LT3575 operates with input supply voltages from 3V to 40V, and can deliver output power up to 14W with no external power switch.The LT3575 utilizes boundary mode operation to provide a small magnetic solution with improved load regulation. The output voltage is easily set with two external resistors and the transformer turns ratio. Off the shelf transformers are available for many applications. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and No RSENSE and Thin SOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. 3V to 40V Input Voltage Range 2.5A, 60V Integrated NPN Power Switch Boundary Mode Operation No Transformer Third Winding or Optoisolator Required for Regulation Improved Primary-Side Winding Feedback Load Regulation VOUT Set with Two External Resistors BIAS Pin for Internal Bias Supply and Power NPN Driver Programmable Soft-Start Programmable Power Switch Current Limit Thermally Enhanced 16-Lead TSSOP APPLICATIONS n Industrial, Automotive and Medical Isolated Power Supplies TYPICAL APPLICATION 5V Isolated Flyback Converter VIN 12V TO 24V 10μF 357k VIN SHDN/UVLO 51.1k 80.6k LT3575 TC RILIM SS VC 28.7k 10k 10n F GND SW TEST BIAS - 2 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 IOUT (A) 3575 TA01b Load Regulation 0.22μF 1k 24μH 3:1 2.6μH 47μF VOUT- OUTPUT VOLTAGE ERROR (%) VOUT 5V, 1.4A + VIN = 24V 0 VIN = 12V RFB RREF 6.04k - 1 11.5k 4.7n F 3575 TA01 4.7μF 3575f...