LT3756_LT3756-1| Datasheet

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LT3756/LT3756-1 100VIN, 100VOUT LED Controller FEATURES
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DESCRIPTION
The LT 3756 and LT3756-1 are DC/DC controllers designed to operate as a constant-current source for driving high current LEDs. They drive a low side external N-channel power MOSFET from an internal regulated 7V supply. The fixed frequency, current-mode architecture results in stable operation over a wide range of supply and output voltages. A ground referenced voltage FB pin serves as the input for several LED protection features, and also makes it possible for the converter to operate as a constant-voltage source. A frequency adjust pin allows the user to program the frequency from 100kHz to 1MHz to optimize efficiency, performance or external component size. The LT3756/LT3756-1 sense output current at the high side of the LED string. High side current sensing is the most flexible scheme for driving LEDs, allowing boost, buck mode or buck-boost mode configuration. The PWM input provides LED dimming ratios of up to 3000:1, and the CTRL input provides additional analog dimming capability. Both parts are avail
able in the 16-lead QFN (3mm 3mm) and MSOP packages.
LT, LTC and LTM 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 and 7321203.

3000:1 True Color PWMTM Dimming Wide Input Voltage Range: 6V to 100V Output Voltage Up to 100V Constant-Current and Constant-Voltage Regulation 100mV High Side Current Sense Drives LEDs in Boost, Buck Mode, Buck-Boost Mode, SEPIC or Flyback Topology Adjustable Frequency: 100kHz to 1MHz Open LED Protection Programmable Undervoltage Lockout with Hysteresis Open LED Status Pin (LT3756) Frequency Synchronization (LT3756-1) PWM Disconnect Switch Driver CTRL Pin Provides Analog Dimming Low Shutdown Current: <1A Programmable Soft-Start Thermally Enhanced 16-Lead QFN (3mm 3mm) and MSOP Packages

APPLICATIONS
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High Power LED Applications Industrial Automotive

TYPICAL APPLICATION
VIN 8V TO 60V (100V TRANSIENT) 4.7F 1M VREF 332k CTRL INTVCC 100k ISN 40.2k GATE OPENLED PWM SS RT PWMOUT VC GND INTVCC 10k 0.001F
3756 TA01a

94% Efficient 30W White LED Headlamp Driver
22H VIN SHDN/UVLO FB ISP LT3756 0.27 370mA 14k 1M 4.7F

Efficiency vs VIN
100

96 EFFICIENCY (%)
30W LED STRING

332k

92

88

SENSE

0.018

84

0.01F 28.7k 400kHz 1%

80

10k

4.7F

0

20

40 VIN (V)

60

80
37561 TA01b

37561f

1

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LT3756_LT3756-1 DATASHEET