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Home » NEWEST Products » New by Manufacturer » Texas Instruments » LM3463 Dynamic Headroom Controller - TI
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Texas Instruments LM3463 Dynamic Headroom Controller

TI LM3463 Dynamic Headroom Controller

Texas Instruments LM3463 Dynamic Headroom Controller is a six-channel linear LED driver with Dynamic Headroom Control (DHC) interface that is specialized for high power LED lighting applications. TI LM3463 delivers accurately regulated current to LEDs while maximizing the system efficiency. The variation of the output current of every output channel in the temperature range of -40°C to 125°C is well controlled to less than ±1%. The output current of every channel is accurately matched to each other with less than ±1% difference. By interfacing TI LM3463 Dynamic Headroom Controller to the output voltage feedback node of a switching power supply via the DHC interface, the system efficiency is optimized automatically. The dynamic headroom control circuit in the LM3463 minimizes power dissipation on the external MOSFETs by adjusting the output voltage of the primary switching power supply according to the changing forward voltage of the LEDs. The dimming control interface of the LM3463 accepts both analog and PWM dimming control signals.

Features
  • Dynamic Headroom Control output to maximize efficiency
  • 6-channel current regulated LED driver
  • High precision analog dimming control interface
  • 4 individual PWM dimming control input
  • Dimming control via digital data bus
  • Built-in maximum MOSFET power limiting mechanism
  • Allows cascade operation to extend the output channels
  • Fault indicator output
  • Thermal shutdown
  • UVLO with hysteresis
Key Specifications
  • Wide supply voltage range (12V-95V)
  • Thermal fold-back dimming control
  • DHC regulates the lowest MOSFET drain voltage to 1V

Applications
  • Streetlights
  • Solid State Lighting Solutions
 

LM3463EVM Evaluation Module (EVM)

Texas Instruments LM3463EVM Evaluation Module (EVM) is designed to evaluate the LM3463, a dynamic headroom controller. It is designed to drive six strings of high brightness LEDs at maximum supply voltage up to 95V. Each output channel of the LM3463 evaluation board is designed to deliver 200mA of LED driving current. The LED turn on voltage is set to 48V by default, thus the board is able to deliver up to 57.6W total output power. The six output channels are divided into 4 individual groups to facilitate average LED current control by means of PWM dimming. The PWM dimming control interface of the LM3463 can accept standard TTL level PWM signals, analog voltage or serial data to control the dimming duty of the four LED groups individually. The analog dimming control interface accepts an analog control voltage in the range from 0V to 2.5V to adjust the reference voltage of the linear current regulators, which enables true LED current adjustment. This evaluation board is designed to be connected to an external primary power supply. Using three connection wires, the VIN, GND and VFB, the dynamic Headroom Control (DHC) circuit of the LM3463 adjusts the output voltage of the primary power supply to maximize system efficiency.

Features
  • Input Voltage Range: 12V to 95V
  • LED Turn On Voltage: 48V Nominal forward
  • Voltage of LED String: 42V
  • Output Current per Channel: 200mA

  • System Clock Frequency: 246kHz
  • DHC Cut-Off Frequency: 0.1Hz
  • Mode of dimming control: Direct PWM Mode
Texas Instruments LM3463EVM Evaluation Module (EVM)

Order Texas Instruments LM3463EVM Evaluation Module (EVM) View Product Detail
Additional Resources
User's Guide User's Guide


Functional Diagram
Functional Diagram
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