LM3424 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs | TI.com

LM3424 (ACTIVE) Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

 

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Description

The LM3424 is a versatile high voltage N-channel MOSFET controller for LED drivers. It can be easily configured in buck, boost, buck-boost and SEPIC topologies. In addition, the LM3424 includes a thermal foldback feature for temperature management of the LEDs. This flexibility, along with an input voltage rating of 75 V, makes the LM3424 ideal for illuminating LEDs in a large family of applications.

Adjustable high-side current sense allows for tight regulation of the LED current with the highest efficiency possible. The LM3424 uses standard peak current-mode control providing inherent input voltage feed-forward compensation for better noise immunity. It is designed to provide accurate thermal foldback with a programmable foldback breakpoint and slope. In addition, a 2.45V reference is provided.

The LM3424 includes a high-voltage startup regulator that operates over a wide input range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching frequencies of up to 2.0 MHz and external synchronization is possible. The controller is capable of high speed PWM dimming and analog dimming.

Features

  • VIN range from 4.5 V to 75 V
  • High-side adjustable current sense
  • 2-Ω, 1-A peak MOSFET gate driver
  • Input undervoltage and output overvoltage protection
  • PWM and analog dimming
  • Cycle-by-cycle current limit
  • Programmable soft-start and slope compensation
  • Programmable, synchronizable switching frequency
  • Programmable thermal foldback
  • Precision voltage reference
  • Low-power shutdown and thermal shutdown

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WEBENCH® Designer LM3424

  V in Lower V in Upper
4.5 ≤  V  V ≤ 75.0
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 Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
LM3424 Order now DC/DC     4.5     75     5     3     72     1     Boost
Boost Controller
Buck-Boost
Sepic    
Analog
PWM    
    Controller
Inductive    
25     2000     2     1.24     4.17 / 4.08     Adjustable Switch Frequency
Enable/Shutdown
Power Good
Soft Start
Synchronization Pin
Thermal Shutdown    
-40 to 125     HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
LM3424-Q1 Order now DC/DC     4.5     75     5     3     72     1     Boost Controller
Buck-Boost Controller
Sepic Controller    
Analog
PWM    
  Inductive     25     2000     2       4.17 / 4.08     Adjustable Switch Frequency
Enable/Shutdown
Power Good
Soft Start
Synchronization Pin
Thermal Shutdown    
-40 to 125     HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)