LT3474IFE

LED照明驱动器 LT3474/LT3474-1 - Step-Down 1A LED Driver

DESCRIPTION

The LT® 3474/LT3474-1 are fi xed frequency step-down DC/DC converters designed to operate as constant-current sources. An internal sense resistor monitors the output current allowing accurate current regulation, ideal for driving high current LEDs. High output current accuracy is maintained over a wide current range, from 35mA to 1A, allowing a wide dimming range.

FEATURES

True Color PWM™ Delivers Constant Color with 400:1 Dimming Range

Wide Input Range: 4V to 36V

Up to 1A LED Current

Adjustable 200kHz–2MHz Switching Frequency

Adjustable Control of LED Current

Integrated Boost Diode

High Output Current Accuracy is Maintained Over a Wide Range from 35mA to 1A

Open LED LT3474 and Short-Circuit Protection

High Side Sense Allows Grounded Cathode Connection

Uses Small Inductors and Ceramic Capacitors

LT3474-1 Drives LED Strings Up to 26V

Compact 16-Lead TSSOP Thermally Enhanced Surface Mount Package