LT8303 100VIN Micropower Isolated Flyback Converter with 150V/450mA Switch FeaTuresDescripTion n 5.5V to 100V Input Voltage Range The LT®8303 is a micropower high voltage isolated flyback n 450mA, 150V Internal DMOS Power Switch converter. By sampling the isolated output voltage directly n Up to 5W of Output Power from the primary-side flyback waveform, the part requires n Low Quiescent Current: no third winding or opto-isolator for regulation. The output 70µA in Sleep Mode voltage is programmed with a single external resistor. 280µA in Active Mode Internal compensation and soft-start further reduce external n Boundary Mode Operation at Heavy Load component count. Boundary mode operation provides a n Low Ripple Burst Mode ® Operation at Light Load small magnetic solution with excellent load regulation. n Minimum Load <0.5% (Typ) of Full Output Low ripple Burst Mode operation maintains high efficiency n VOUT Set with a Single External Resistor at light load while minimizing the output voltage ripple. n No Transformer Third Winding or Opto-Isolator A 450mA, 150V DMOS power switch is integrated along Required for Regulation with all high voltage circuitry and control logic into a 5-lead n Accurate EN/UVLO Threshold and Hysteresis ThinSOT™ package. n Internal Compensation and Soft-Start The LT8303 operates from an input voltages range of 5.5V n 5-Lead TSOT-23 Package to 100V and can deliver up to 5W of isolated output power. The high level of integration and the use of boundary mode and low ripple Burst Mode operations result in a simple to applicaTions use, low component count, and high efficiency application n Isolated Telecom, Datacom, Automotive, Industrial, solution for isolated power delivery. L and Medical Power Supplies , LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the n Isolated Auxiliary/Housekeeping Power Supplies property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497, and 7471522. Typical applicaTion6V to 80VIN, 5VOUT Isolated Flyback ConverterEfficiency vs Load Current 100 T1 V + IN VOUT 6:1 6V TO 80V 5V 90 • 4.7µF V 150µH 4.2µH IN • 100µF 80 LT8303 EN/UVLO SW V – OUT 70 316k 2.5mA TO 0.33A (V EFFICIENCY (%) IN = 12V) 60 RFB 2.5mA TO 0.52A (VIN = 24V) VIN = 12V GND 2.5mA TO 0.73A (VIN = 48V) 50 VIN = 24V 2.5mA TO 0.84A (VIN = 72V) 8303 TA01a VIN = 48V VIN = 72V 40 0 100 200 300 400 500 600 700 800 900 LOAD CURRENT (mA) 8303 TA01b 8303fa For more information www.linear.com/LT8303 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
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