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LT1871EMS-7-TRPBF Datasheet(PDF) 1 Page - Linear Technology |
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LT1871EMS-7-TRPBF Datasheet(HTML) 1 Page - Linear Technology |
1 / 32 page LTC1871-7 1 18717fc TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Input Voltage, Current Mode Boost, Flyback and SEPIC Controller The LTC®1871-7 is a current mode, boost, flyback and SEPIC controller optimized for driving 6V-rated MOSFETs in high voltage applications. The LTC1871-7 works equally well in low or high power applications and requires few components to provide a complete power supply solution. The switching frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 6V and a low shutdown quiescent current of 10μA make the LTC1871-7 well suited for battery-operated systems. For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/SYNC pin. The LTC1871-7 is available in the 10-lead MSOP package. Figure 1. Small, Nonisolated 12V Flyback Telecom Housekeeping Supply n Optimized for High Input Voltage Applications n Wide Chip Supply Voltage Range: 6V to 36V n Internal 7V Low Dropout Voltage Regulator Optimized for 6V-Rated MOSFETs n Current Mode Control Provides Excellent Transient Response n High Maximum Duty Cycle (92% Typ) n ±2% RUN Pin Threshold with 100mV Hysteresis n ±1% Internal Voltage Reference n Micropower Shutdown: IQ = 10μA n Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor n Synchronizable to an External Clock Up to 1.3 × fOSC n User-Controlled Pulse Skip or Burst Mode® Operation n Output Overvoltage Protection n Can be Used in a No RSENSE™ Mode for VDS < 36V n Small 10-Lead MSOP Package n Telecom Power Supplies n 42V Automotive Systems n 24V Industrial Controls n IP Phone Power Supplies L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. PARAMETER LTC1871-7 LTC1871 INTVCC 7.0V 5.2V INTVCC UV+ 5.6V 2.1V INTVCC UV– 4.6V 1.9V RUN ITH FB FREQ MODE/SYNC SENSE VIN INTVCC GATE GND LTC1871-7 120k 4.7μF X5R 2.2μF 100V X7R M1 FDC2512 0.12Ω VIN 36V TO 72V 3.4k 2.2nF 26.7k D3 10BQ060 47μF 16V X5R VOUT 12V 0.4A 604k 12.4k T1 VP1-0076 100k 10Ω Q1 FMMT625 D2 4148 D1 9.1V 110k 0.1μF X5R 3:1 18717 F01 |
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