LM3424_14 Datasheet, PDF (1/62 Pages) Texas Instruments – Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs

LM3424
www.ti.com
SNVS603B – AUGUST 2009 – REVISED OCTOBER 2009
LM3424 Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
Check for Samples: LM3424
FEATURES
1
•2 LM3424Q is an Automotive Grade product that
is AEC-Q100 grade 1 qualified (-40°C to +125°C
operating junction temperarure)
• V_IN range from 4.5V to 75V
• High-side adjustable current sense
• 2Ω, 1A Peak MosFET gate driver
• Input under-voltage and output over-voltage
protection
• PWM and analog dimming
• Cycle-by-cycle current limit
• Programmable slope compensation
• Programmable, synchronizable switching
frequency
• Programmable thermal foldback
• Programmable softstart
• Precision voltage reference
• Low power shutdown and thermal shutdown
APPLICATIONS
• LED Drivers - Buck, Boost, Buck-Boost, and
SEPIC
• Indoor and Outdoor Area SSL
• Automotive
• General Illumination
• Constant-Current Regulators
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 75V, makes the
LM3424 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 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 4.5V to 75V. 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.
Additional features include slope compensation, softstart, over-voltage and under-voltage lock-out, cycle-by-cycle
current limit, and thermal shutdown.
The LM3424Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009, Texas Instruments Incorporated