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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT3797 датащи(PDF) 1 Page - Linear Technology |
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LT3797 датащи(HTML) 1 Page - Linear Technology |
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1 / 36 page  LT3797 1 3797f For more information www.linear.com/LT3797 TYPICAL APPLICATION FEATURES DESCRIPTION Triple Output LED Driver Controller The LT®3797 is a triple output DC/DC controller designed to drive three strings of LEDs. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. The LT3797 includes anintegratedDC/DCconvertertoproducearegulated7.5V supply for the N-channel MOSFET gate drivers of the three channels.Thishighefficiencyconverterenablesthepartto operate from a wide input voltage range from 2.5V to 40V. The LT3797 is designed so that each converter can use the most suitable configuration to drive its LED load, whether step-up, step-down or a combination. Two key features enable this flexibility: first the LT3797 can sense output current at the high side of the LED string; and second, the voltage feedback pin, FBH, is referred to the ISP current sensing input. The CTRL inputs provide output current analog dimming capability. The TG drivers level shift the PWMsignalstodrivethegatesofexternalLED-disconnect P-channel MOSFETs, allowing high PWM dimming range, andprovidingLEDovercurrentprotectionandshort-circuit protected boost capability. Triple Boost LED Driver APPLICATIONS n Three Independent LED Driver Channels n Wide Input Voltage Range: 2.5V to 40V n VIN Transient Ride-Through Up to 60V n Rail-to-Rail LED Current Sense: 0V to 100V n 3000:1 PWM Dimming n TG Drivers for PMOS LED Disconnection n Operates in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology n Open-LED Protection n Short-Circuit Protected Boost Capable n Fault Flags for Independent Channels n Programmable VIN Undervoltage and Overvoltage Lockout n Adjustable Switching Frequency: 100kHz to 1MHz n Synchronizeable to an External Clock n CTRL Pins Provide Analog Dimming n Programmable Soft-Start n 52-Lead QFN Package n Automotive and Industrial Lighting n RGB Lighting n Billboards and Large Displays L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203, 7746300. OVLO CTRL1-3 487k 75k VREF VIN RT SYNC SW1 BOOST INTVCC GND VC1-3 FBH1-3 SW2 48.7k 300kHz 0.1µF 47µH PWM1-3 FLT1-3 SS1-3 4.7µF ×3 1µF 0.1µF 10µF 3797 TA01 10nF 4.7k 1M 20.5k 47.5k VIN 2.5V TO 40V (60V TRANSIENT, 41V INTERNAL OVLO PROTECTION) 49.9k ISP1-3 EN/UVLO VIN ISN1-3 GATE1 SENSEP1 SENSEN1 TG1 8m 0.1µF 4.7µF 100V ×2 10µH GATE2 SENSEP2 SENSEN2 TG2 LT3797 8m 10µH GATE3 SENSEP3 SENSEN3 TG3 8m 1A 50V 1A 50V ISN3 ISP3 10µH ISN2 ISP2 ISN1 ISP1 250m 4.7µF 100V ×2 250m 4.7µF 100V ×2 250m 1A 50V 0.1µF 0.1µF |
Аналогичный номер детали - LT3797 |
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Аналогичное описание - LT3797 |
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