LM3492HC Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator | TI.com

LM3492HC (ACTIVE) Two-Channel Individual Dimmable LED Driver with Boost Converter and Fast Current Regulator

 

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Description

The LM3492HC/-Q1 device integrates a boost converter and a two-channel current regulator to implement a highly efficient and cost effective LED driver. This device drives two individually dimmable LED strings with a maximum power of 15 W and an output voltage of up to 65 V. The boost converter employs a proprietary projected-on-time control method to give a fast transient response with no compensation required. The nearly constant switching frequency can be set to a level from 200 kHz to 1 MHz. Ceramic capacitors stabilize the application circuit and produce no audible noise on dimming. The programmable peak current limit and soft-start features reduce current surges at start-up. An integrated, 190-mΩ, 3.9-A, N-Channel MOSFET switch minimizes the solution size. The fast slew rate current regulator allows high frequency and narrow pulse width dimming signals to achieve a very high contrast ratio of 10000:1. The LED current can be set from 50 mA to 250 mA by a single resistor.

For all available packages, see the orderable addendum at the end of the data sheet.

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To maximize the efficiency, (DHC) automatically adjusts the output voltage to a minimum. The DHC also facilitates a single BOM for different number of LED in a string, which is required for back-light panels of different size, thereby reducing overall development time and cost. The LM3492HC device includes a COMM pin that serves as a bidirectional I/O pin. The versatile COMM pin interface with an external micro-controller unit (MCU) is used for the following functions: power-good, overtemperature, IOUT overvoltage and undervoltage indications, switching frequency tuning, and channel 1 disabling. Other supervisory functions of the device include precise enable, VCC undervoltage lockout, current regulator over-power protection, and thermal shutdown protection. The device is available in the thermally enhanced PWP, 20-pin package.

Features

  • Boost Converter
    • Automotive Grade Product, Q100 Grade-1 Qualified
    • Very Wide Input Voltage Range: 4.5 V to 65 V
    • Programmable Soft-Start Period
    • No Loop Compensation Required
    • Stable with Ceramic and Other Low ESR Capacitors with No Audible Noise
    • Nearly Constant Switching Frequency Programmable from 200 kHz to 1 MHz
  • Current Regulator
    • Programmable LED Current: 50 mA to 250 mA
    • 10000:1 Contrast Ratio, 300-ns Minimum Pulse Width
    • Two Individual Dimmable LED Strings up to 65 V, Total 15 W (Typically 28 LEDs at 150 mA)
    • Dynamic Headroom Control Maximizes Efficiency
    • Over-Power Protection
    • ±3% Current Accuracy
  • Supervisory Functions
    • Precision Enable
    • COMM I/O Pin for Diagnostic and Commands
    • Thermal Shutdown Protection
    • Thermally Enhanced PWP, 20-Pin Package

WEBENCH® Designer LM3492HC

  V in Lower V in Upper
4.5 ≤  V  V ≤ 65.0
Ambient Temp  °C ≤ 125°C
Light Output (optional)  Lumens

Parametrics

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Part number Order Input voltage (type) Vin (Min) (V) Vin (Max) (V) Iout (Max) (A) Vout (Min) (V) Vout (Max) (V) Regulated outputs (#) Topology Dimming method Power factor correction (Min) Type Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Vref (V) UVLO thresholds on/off (V) Features Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3492HC Order now DC/DC     4.5     65     0.25     5     65     2     Boost
Boost with Current Sink
Multi-Channel    
PWM    
   
Converter
Inductive
Linear    
200     1000     3.6     1.25     4 / 3.7     Adjustable Switch Frequency
Enable/Shutdown
Integrated Switch
Power Good
Soft Start
Thermal Shutdown    
Catalog     -40 to 125     HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
LM3492 Order now DC/DC     4.5     65     0.2     5     65     2     Boost
Boost with Current Sink
Multi-Channel    
PWM    
   
Converter
Inductive
Linear    
200     1000     3.6     1.25     3.78 / 3.48     Adjustable Switch Frequency
Enable/Shutdown
Integrated Switch
Power Good
Soft Start
Thermal Shutdown    
Catalog     -40 to 125     HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)