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LT3758 Datasheet(PDF) 1 Page - Linear Technology |
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LT3758 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page LT8300 1 8300f Typical applicaTion FeaTures DescripTion 100VIN Micropower Isolated Flyback Converter with 150V/260mA Switch The LT®8300 is a micropower high voltage isolated flyback converter. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires nothirdwindingoropto-isolatorforregulation.Theoutput voltage is programmed with a single external resistor. In- ternal compensation and soft-start further reduce external component count. Boundary mode operation provides a small magnetic solution with excellent load regulation. LowrippleBurstModeoperationmaintainshighefficiency at light load while minimizing the output voltage ripple. A 260mA, 150V DMOS power switch is integrated along withallhighvoltagecircuitryandcontrollogicintoa5-lead ThinSOT™ package. The LT8300 operates from an input voltages range of 6V to 100V and can deliver up to 2W of isolated output power. The high level of integration and the use of boundary and low ripple burst modes result in a simple to use, low component count, and high efficiency application solution for isolated power delivery. L , 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 property of their respective owners. Protected by U.S. Patents, including 5438499, 7463497, and 7471522. 5V Micropower Isolated Flyback Converter applicaTions n 6V to 100V Input Voltage Range n 260mA, 150V Internal DMOS Power Switch n Low Quiescent Current: 70µA in Sleep Mode 330µA in Active Mode n Boundary Mode Operation at Heavy Load n Low-Ripple Burst Mode® Operation at Light Load n Minimum Load <0.5% (Typ) of Full Output n VOUT Set with a Single External Resistor n No Transformer Third Winding or Opto-Isolator Required for Regulation n Accurate EN/UVLO Threshold and Hysteresis n Internal Compensation and Soft-Start n 5-Lead TSOT-23 Package n Isolated Telecom, Automotive, Industrial, Medical Power Supplies n Isolated Auxiliary/Housekeeping Power Supplies Efficiency vs Load Current LT8300 4:1 RFB SW 300µH 19µH EN/UVLO 1M 2.2µF 40.2k VIN VIN 36V TO 72V VOUT+ 5V 1mA TO 300mA VOUT– GND 210k • • 47µF 8300 TA01a LOAD CURRENT (mA) 100 20 30 90 40 10 60 70 80 50 0 8300 TA01b 300 250 200 150 100 50 0 VIN = 48V VIN = 72V VIN = 36V |
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