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LM3423

ACTIVE

N-channel controllers for constant current LED drivers with series DIM FET driver and fault flag

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TPS92692-Q1 ACTIVE high-accuracy LED controller with spread spectrum frequency modulation and internal PWM Generator Multi-topology capabilities with integrated N-channel FET and a spread spectrum synchronization pin.

Product details

Input voltage type DC/DC Topology Boost, Boost Controller, Buck-Boost, SEPIC Vin (min) (V) 4.5 Vin (max) (V) 75 Vout (max) (V) 72 Vout (min) (V) 3 Iout (max) (A) 5 Iq (typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog, PWM Number of channels 1 Rating Catalog
Input voltage type DC/DC Topology Boost, Boost Controller, Buck-Boost, SEPIC Vin (min) (V) 4.5 Vin (max) (V) 75 Vout (max) (V) 72 Vout (min) (V) 3 Iout (max) (A) 5 Iq (typ) (mA) 2 Features Adjustable Switch Frequency, Enable/Shutdown, Thermal shutdown Operating temperature range (°C) -40 to 125 Dimming method Analog, PWM Number of channels 1 Rating Catalog
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • 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)
  • 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)

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.

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.

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TPS92692 ACTIVE high accuracy LED controller with spread spectrum frequency modulation and internal PWM Generator This product is a multi-topology low-side NFET LED controller with spread spectrum capability. It supports both analog and PWM dimming (with external P-FET).

Technical documentation

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Type Title Date
* Data sheet LM342x N -Channel Controllers for Constant-Current LED Drivers datasheet (Rev. G) PDF | HTML 30 Jul 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article Driving LEDs: topology matters PDF | HTML 26 Feb 2016
Application note AN-1656 Design Challenges of Switching LED Drivers (Rev. A) 03 May 2013
EVM User's guide AN-2010 LM3423 Buck-Boost 2 Layer Evaluation Board (Rev. C) 03 May 2013
EVM User's guide AN-2011 LM3423 Boost 2 Layer Evaluation Board (Rev. A) 03 May 2013
EVM User's guide AN-1872 LM3423 Boost Evaluation Board (Rev. B) 01 May 2013
EVM User's guide AN-1907 LM3423 Buck-Boost Configuration Evaluation Board (Rev. A) 01 May 2013
Application note AN-1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool (Rev. A) 23 Apr 2013
User guide Ambient Light Adaptive LED Driver User Guide 27 Jan 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM3423BBLSCSEV — LM3423 Buck-Boost 2-Layer Low Side Current Sense Evaluation Board

This wide range evaluation board showcases the LM3423 NFET controller used with a buck-boost current regulator. It is designed to drive 4 to 8 LEDs at a maximum average LED current of 700 mA from a DC input voltage of 10 to 70V.

The evaluation board showcases most features of the LM3423 including (...)

User guide: PDF
Not available on TI.com
Evaluation board

LM3423BS2LYEV — Boost 2 Layer LED Driver Evaluation Board

This evaluation board showcases the LM3423 NFET controller used with a boost current regulator. It is designed to drive 9 to 12 LEDs at a maximum average LED current of 700mA from a DC input voltage of 10 to 26V. The evaluation board showcases most features of the LM3423 including PWM dimming, (...)

User guide: PDF
Not available on TI.com
Simulation model

LM3423 PSpice Transient Model (Rev. A)

SNVMA70A.ZIP (124 KB) - PSpice Model
Simulation model

LM3423 TINA-TI Startup Reference Design

SNVMAS4.TSC (803 KB) - TINA-TI Reference Design
Simulation model

LM3423 TINA-TI Steady Reference Design

SNVMAS3.TSC (808 KB) - TINA-TI Reference Design
Simulation model

LM3423 TINA-TI Transient Spice Model

SNVMAS2.ZIP (21 KB) - TINA-TI Spice Model
CAD/CAE symbol

Ambient Light Adaptive LED Driver CAD Files

SNVC025.ZIP (123 KB)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins CAD symbols, footprints & 3D models
HTSSOP (PWP) 20 Ultra Librarian

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