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LT3756 Datasheet(PDF) 1 Page - Linear Technology |
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LT3756 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LT3760 1 3760fc Typical applicaTion DescripTion 8-Channel × 100mA LED Driver The LT®3760 is an 8-channel LED driver with a step-up DC/DC controller capable of driving up to 45V of LEDs. Each channel contains an accurate current sink with ±2% currentmatching.Channelsfollowamasterprogrammable current to allow between 20mA to 100mA of LED current per string. Channels can be paralleled for higher LED current. Output voltage adapts to variations in LED VF for optimum efficiency and open LED faults do not affect the operation of connected LED strings. The LT3760 allows a PWM dimming range up to 3000:1 and an analog dimming range up to 25:1. Operating frequency can be programmed from 100kHz up to 1MHz usingasingleresistororsynchronizedtoanexternalclock. Additional features include: programmable maximum VOUT for open LED protection, a fault flag for open LED, programmable LED current derating vs temperature, mi- cropower shutdown and internal soft-start. The LT3760 is available in a thermally enhanced 28-pin TSSOP package. L , LT, LTC and LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7199560, 7321203. FeaTures applicaTions n Automotive, Notebook and TV Monitor Backlighting n Up to 45V of LEDs × 100mA, 8-Channel LED Driver n Wide Input Range : 6V to 40V (4.5V to 13V, VIN Connected to INTVCC) n ±2% LED Current Matching at 40mA (Typ ±0.7%) n Up to 3000:1 True Color PWM™ Dimming Range n Single Resistor Sets LED Current (20mA to 100mA) n LED Current Regulated Even for PVIN > VOUT n Output Adapts to LED VF for Optimum Efficiency n Fault Flag + Protection for Open LED Strings n Protection for LED Pin to VOUT Short n Parallel Channels for Higher LED Current n Programmable LED Current Derating vs Temperature n Accurate Undervoltage Lockout Threshold with Programmable Hysteresis n Programmable Frequency (100kHz to 1MHz) n Synchronizable to an External Clock Worst-Case Channels LED Current Matching (Normalized to 8-Channel Average) 92% Efficient, 36W Backlight LED Driver LT3760 GATE 5 × 2.2µF 10µH 0.015 VOUT SENSE LED1 LED2 CTRL PWM REF TSET OVPSET RT GND ISET VC SYNC VIN VIN 8V TO 14V PVIN 20V TO 36V 4.7µF 4.7µF INTVCC 40.2k 499k PGND • • • • • • • • • • 11k 30.9k 20k 39.2k 1MHz 5.76k 10k 100k 8 CHANNELS × 100mA 2.2nF 3760 TA01 SHDN/UVLO FAULT LED7 LED8 • • • • • • • • VIN 4.7µF • • • • UP TO 45V OF LEDs PER STRING 20k JUNCTION TEMERATURE (°C) –50 –25 0.8 0.4 0.0 –0.4 –0.8 100 0 25 3760 TA01 125 50 75 RISET = 14.7k (I(LED) = 40mA) |
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