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LM3424 Dataheets PDF



Part Number LM3424
Manufacturers Texas Instruments
Logo Texas Instruments
Description Constant Current N-channel Controller
Datasheet LM3424 DatasheetLM3424 Datasheet (PDF)

Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design LM3424 SNVS603D – AUGUST 2009 – REVISED JULY 2019 LM3424 Constant Current N-channel Controller with Thermal Foldback For Driving LEDs 1 Features •1 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 slop.

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Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design LM3424 SNVS603D – AUGUST 2009 – REVISED JULY 2019 LM3424 Constant Current N-channel Controller with Thermal Foldback For Driving LEDs 1 Features •1 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 2 Applications • LED Drivers (buck, boost, buck-boost, and SEPIC) • Indoor and outdoor area SSL • General illumination • Constant-current regulators 3 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. Typical Boost Application Circuit VIN 1 VIN LM3424 20 HSP 2 EN 19 HSN Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) LM3424 HTSSOP (20) 6.50 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. 3 COMP 18 SLOPE 4 CSH 5 RT/SYNC 17 IS 16 VCC ILED PWM 6 nDIM 15 GATE 7 SS 14 GND 8 TGAIN 13 DDRV 9 TEMP TSENSE 10 TREF DAP 12 OVP 11 VS 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. LM3424 SNVS603D – AUGUST 2009 – REVISED JULY 2019 www.ti.com Table of Contents 1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Pin Configuration and Functions ......................... 3 6 Specifications......................................................... 4 6.1 Absolute Maximum Ratings ...................................... 4 6.2 ESD Ratings.............................................................. 4 6.3 Recommended Operating Conditions....................... 4 6.4 Thermal Information .................................................. 5 6.5 Electrical Characteristics........................................... 5 6.6 Typical Characteristics ............................................. 8 7 Detailed Description ............................................ 11 7.1 Overview ................................................................. 11 7.2 Functional Block Diagram ....................................... 11 7.3 Feature Description................................................. 12 7.4 Device Functional Modes........................................ 25 8 Application and Implementation ........................ 26 8.1 Application Information............................................ 26 8.2 Typical Applications ................................................ 29 9 Power Supply Recommendations...................... 61 9.1 Input Supply Current Limit ...................................... 61 10 Layout................................................................... 61 10.1 Layout Guidelines ................................................. 61 10.2 Layout Example .................................................... 62 11 Device and Documentation Support ................. 63 11.1 Device Support...................................................... 63 11.2 Community Resources.......................................... 63 11.3 Trademarks ........................................................... 63 11.4 Electrostatic Discharge Caution ............................ 63 11.5 Glossary ................................................................ 63 12 Mechanical.


IRIS-F6428S LM3424 NPA-100


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