LM3432BSQ National Semiconductor, LM3432BSQ Datasheet

LM3432BSQ

Manufacturer Part Number

LM3432BSQ

Description

LM3432/LM3432B 6-Channel Current Regulator for LED Backlight Application; Package: LLP; No of Pins: 24; Qty per Container: 1000; Container: Reel

Manufacturer

National Semiconductor

Datasheet

1.LM3432BSQ.pdf (18 pages)

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LM3432/LM3432B

6-Channel Current Regulator for LED Backlight Application

General Description

The LM3432/LM3432B are 6-channel high voltage current

regulators which provide a simple solution for LED backlight

applications. These devices incorporate six individual current

regulator channels to give accurate driving current for each

LED string. The string-to-string tolerance is kept within ±2.0%.

Additionally, the Dynamic Headroom Control output can com-

municate with a LM3430 boost regulator to adjust the LED

supply voltage to the lowest level needed to keep the string

current in regulation, yielding optimal overall system efficien-

cy.

The 6-channel current sink can be adjusted from 15mA to

40mA by an external resistor. Their output drivers can with-

stand up to 80V. Digital PWM or analog voltage signal can be

used to control the duty cycle of all the channels. With a fast

current switching slew rate, t

control and wide dimming ratio during PWM dimming are en-

sured.

The LM3432/LM3432B contain LED open/short circuit and

over-temperature fault signaling to the system micro-con-

troller (the LM3432B does not include open circuit fault sig-

naling). These devices are available in a low profile, thermally

enhanced 24 lead LLP package. The LM3432 is also avail-

able in the 28 lead eTSSOP.

= 60ns typical, accurate current

300064

Features

■

Applications

■

Dynamic Headroom Control (DHC) output to maximize

efficiency when used in conjunction with National

Semiconductor's LM3430 Boost Controller for LED

Backlighting

Current sinking adjustable up to 40mA in each string

Fast current switching slew rate, t

Wide dimming ratio, up to 4000:1 with f

High LED driving voltage up to 80V

±2.0% current matching between strings

Accepts both Digital and Analog dimming control

LED open/short fault indication (For LM3432B, no open

fault indication)

Over-Temperature Indication

Internal Thermal Shutdown with Hysteresis

Low profile, thermally enhanced LLP-24 (5x4x0.8mm) and

eTSSOP-28 (9.7x6.4x1.1mm) packages (The LM3432B is

available in the LLP-24 only)

LCD display backlight applications

General lighting solutions

= 60ns typical

DIM

= 500Hz

www.national.com

May 22, 2008

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