LM3421 N-Channel Controllers for Constant Current LED Drivers | TI.com

LM3421 (ACTIVE) N-Channel Controllers for Constant Current LED Drivers

 

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Description

The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75 V, makes the these controllers ideal for illuminating LEDs in a large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3421 and LM3423 devices use predictive off-time (PRO) control, which is a combination of peak current-mode control and a predictive off-timer. This method of control eases the design of loop compensation while providing inherent input voltage feed-forward compensation.

The LM3421 and LM3423 devices include a high-voltage start-up 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 MHz, thus enabling compact solutions.

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 Switching Frequency
  • Zero Current Shutdown and Thermal Shutdown
  • LED Output Status Flag (LM3423 and LM3423-Q0 Only)
  • Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only)

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WEBENCH® Designer LM3421

  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)
LM3421 Order now DC/DC     4.5     75     5     3     72     1     Boost
Boost Controller
Buck-Boost
Sepic    
Analog
PWM    
    Controller
Inductive    
100     2000     2     1.24     4.17 / 4.08     Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown    
-40 to 125     HTSSOP | 16     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
LM3421-Q1 Order now DC/DC     4.5     75     5     3     72     1     Boost Controller
Buck-Boost Controller
Sepic Controller    
Analog
PWM    
  Inductive     100     2000     2       4.17 / 4.08     Adjustable Switch Frequency
Enable/Shutdown
Thermal Shutdown    
-40 to 125
-40 to 150    
HTSSOP | 16     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)