DC2176A, Demo Board Using LT3909EDD, 7 to 36V Vin, VLED up to 35V @ 50mA, 2-String Boost LED Driver

Reference Design using part LT3909EDD#PBF by Analog Devices

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Efficiency vs Input Voltage Chart (Sheet 1 of 3)
DC2176A Schematic (Sheet 2 of 3)
DC2176A Schematic (Sheet 3 of 3)
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Manufacturer

Analog Devices
  • Application Category
    Lighting
  • Product Type
    General LED Driver
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Associated Documents

For End Products

  • Displays
  • GPS
  • Instrument Cluster
  • Personal Digital Assistant
  • Portable Computers

Description

  • DC2176A, Demonstration Circuit features the LT3909, a 2-string + 50mA, 2MHz step-up LED driver with 1.8% current matching. The LT3909 precisely regulates two LED strings for equal current, supports LED dimming that reduces brightness down to a 1/40,000 ratio, protects against faults and also reports faults. The LT3909 consists of a step-up converter with a fixed 2MHz switching frequency and current sources for the LED strings. The maximum current in each LED string is 40mA. The ISET resistor can be changed to 20.0k Ohm to program the string current to 50mA

Key Features

  • Input Voltage
    7 to 36 V
  • Output Voltage
    35 V
  • Output Current
    0.05 A
  • Number of Derived Elements
    2

Featured Parts (1)

Featured Parts
Part Number Manufacturer Type Description
LT3909EDD#PBF Analog Devices LED Drivers LED Driver 20 Segment 700uA Supply Current 12-Pin DFN EP Tube Buy

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