Analog Devices LT3754

Beschreibung

The LT®3754 is a 16-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 ±2.8% current matching. Channels follow a master programmable current to allow between 10mA to 50mA of LED currentper 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 LT3754 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 using a single resistor or synchronized to an external clock.Additional features include: programmable maximum VOUT for open LED protection, a fault flag for open LED, programmable LED current derating vs temperature, micropower shutdown and internal soft-start. The LT3754is available in a thermally enhanced 5mm × 5mm 32-pin QFN package.

Eigenschaften

• Up to 45V of LEDs × 50mA, 16-Channel LED Driver
• Wide Input Range : 6V to 40V (4.5V to 13V,
• VIN Connected to INTVCC)
• ±2.8% LED Current Matching at 20mA (Typ ±0.7%)
• Up to 3000:1 True Color PWM™ Dimming Range
• Single Resistor Sets LED Current (10mA to 50mA)
• LED Current Regulated Even for PVIN > VOUT
• Output Adapts to LED VF for Optimum Efficiency
• Fault Flag + Protection for Open LED Strings
• Protection for LED Pin to VOUT Short
• Parallel Channels for Higher LED Current
• Programmable LED Current Derating vs Temperature
• Accurate Undervoltage Lockout Threshold with Programmable Hysteresis
• Programmable Frequency (100kHz to 1MHz)
• Synchronizable to an External Clock

Typische Anwendungen

• Automotive, Notebook and TV Monitor Backlighting

Weiterführende Informationen

• Datenblatt
• Produktseite des IC-Herstellers