Features • 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, tr = 60ns typical • Wide dimming ratio, up to 4000:1 with fDIM = 500Hz • 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) 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 communicate 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 efficiency. The 6-channel current sink can be adjusted from 15mA to 40mA by an external resistor. Their output drivers can withstand 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, tr = 60ns typical, accurate current control and wide dimming ratio during PWM dimming are ensured. The LM3432/LM3432B contain LED open/short circuit and over-temperature fault signaling to the system micro-controller (the LM3432B does not include open circuit fault signaling). These devices are available in a low profile, thermally enhanced 24 lead LLP package. The LM3432 is also available in the 28 lead eTSSOP. Applications • LCD display backlight applications • General lighting solutions

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Datasheet

Title		Size	Date	Other Language
	LM3432/LM3432B 6-Channel Current Regulator for LED Backlight Application	408 Kbytes	22-May-08

Featured Application Notes

Title		Size	Date	Other Language
	AN-1679: Application Note 1679 LED Backlighting Solution with LM3430 and LM3432	2763 Kbytes	18-Sep-07
	AN-1907: Application Note 1907 LM3423 Buck-Boost Configuration Evaluation Board	879 Kbytes	8-Dec-08

More Application Notes

Title		Size	Date	Other Language
	AN-1937: Application Note 1937 LM3433 10A to 40A LED Driver Evaluation Board	1559 Kbytes	25-Mar-09
	AN-1736: Application Note 1736 LM3433 HB LED Driver Evaluation Kit	1011 Kbytes	4-Feb-08
	AN-1764: Application Note 1764 LM3431 Evaluation Board	588 Kbytes	10-Jan-08	中文
	AN-1793: Application Note 1793 LM3433 4A to 20A LED Driver Evaluation Board	701 Kbytes	25-Aug-08	中文
	AN-1529: Application Note 1529 LM3430 Evaluation Board	2770 Kbytes	21-Aug-07	中文

Design Tools

Title	Size	Date
Article - Methods and Features of LED Drivers

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3432BSQE	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM3432MH	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM3432MHX	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM3432SQ	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM3432SQE	ABCD150XV2	0	3601	0	0	1155496	4	327875145
LM3432SQX	ABCD150XV2	0	3601	0	0	1155496	4	327875145

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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