6-Channel High Voltage, Constant Current LED Driver with Dynamic Headroom Control - LM3463

LM3463 (ACTIVE)

6-Channel High Voltage, Constant Current LED Driver with Dynamic Headroom Control

Description

The LM3463 is a six channel linear LED driver with Dynamic Headroom Control (DHC) interface that is specialized for high power LED lighting applications. 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 as well.

By interfacing the LM3463 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. Comprising the advantages of linear and switching converters, the LM3463 delivers accurately regulated current to LEDs while maximizing the system efficiency.

The dimming control interface of the LM3463 accepts both analog and PWM dimming control signals. The analog dimming control input controls the current of all LEDs while the PWM control inputs control the dimming duty of output channels individually.

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Description

The LM3463 provides a sophisticated protection mechanism that secures high reliability and stability of the lighting system. The protection features include VIN Under-Voltage–Lock-Out (UVLO), thermal shut-down, LED short / open circuit protection and MOSFET drain voltage limiting. The LED short circuit protection protects both the LED and MOSFETS by limiting the power dissipation on the MOSFETS.

Features

  • Dynamic Headroom Control Output to Maximize Efficiency
  • 6 Channels 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
  • 48L WQFN Package

Key Specifications

  • Wide supply voltage range (12V-95V)
  • Thermal fold-back dimming control
  • DHC regulates the lowest MOSFET drain voltage to 1V

All trademarks are the property of their respective owners.

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Parametrics Compare all products in LED Lighting - Illumination

 
Input Voltage (Type)
Vin (Min) (V)
Vin (Max) (V)
Iout (Max) (A)
Vout (Min) (V)
Vout (Max) (V)
Regulated Outputs (#)
Topology
Dimming Method
Type
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Vref (V)
UVLO Thresholds On/Off (V)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM3463
DC/DC    
12    
95    
6    
0.9    
95    
6    
Current Sink    
Analog
PWM    
Linear    
0    
0    
9.75    
2.5    
7.4 / 7.1    
Enable/Shutdown
Thermal Shutdown    
Catalog    
-40 to 125    
48WQFN    
2.35 | 1ku    

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