LT3761EMSE#PBF

LT®3761 is a DC/DC controller designed to operate as a constant-current source and constant-voltage regulator. It features a programmable internal PWM dimming signal. This is ideally suited for driving high current LEDs, but also has features to make it suitable for charging batteries and supercapacitors. The fixed frequency, current mode architecture results in stable operation over a wide range of supply and output voltages. A voltage feedback 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. This senses output current at the high side or at the low side of the load. Typical applications are high voltage LED strings <gt/>100V with ground, referred current sense, grounded anode LEDs, accurate current limited voltage regulators.

• 3000:1 True Colour PWM™ dimming for LEDs, programmable PWM dimming signal generator
• Drives LEDs in boost, SEPIC, inverting, buck mode, buck-boost mode, or flyback configuration
• Output short-circuit protected boost, open LED protection
• Programmable VIN UVLO with hysteresis, C/10 indication for battery chargers
• Open LED status pin, analogue dimming
• VIN minimum operating voltage is 4.5V (TA=25°C. VIN=24V, EN/UVLO=24V, CTRL=2V, PWM=5V)
• VIN shutdown IQ is 1µA (EN/UVLO=0V, PWM=0V, TA=25°C. VIN=24V, EN/UVLO=24V, CTRL=2V, PWM=5V)
• 16-lead plastic MSOP package
• Temperature rating range from –40°C to 125°C

Opombe

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