LM3432SQE National Semiconductor, LM3432SQE Datasheet
LM3432SQE
Specifications of LM3432SQE
Related parts for LM3432SQE
LM3432SQE Summary of contents
Page 1
... 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. © 2008 National Semiconductor Corporation Features ■ Dynamic Headroom Control (DHC) output to maximize ...
Page 2
Typical Application Circuit www.national.com 2 30006401 ...
Page 3
... Connection Diagrams Top View 24 Lead Plastic LLP-24 NS Package Number SQA24B Ordering Information Part Number For LM3432 LM3432SQ LM3432SQX LM3432SQE LM3432MH LM3432MHX For LM3432B LM3432BSQ LM3432BSQX LM3432BSQE 30006402 Package Type NS Package Drawing LLP-24 SQA24B eTSSOP-28 MXA28A LLP-24 SQA24B 3 Top View 28 Lead Plastic eTSSOP-28 ...
Page 4
Pin Descriptions Pin Number LLP-24 eTSSOP- 12,13,15,17,19,20 15, 17, 19, 21 11,14,16,18,21,23 2, ...
Page 5
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN Voltage IREF Voltage IOUT1 through IOUT6 Voltage VCC Voltage EN Voltage FAULTb, OTMb Voltage MODE Voltage PWM Voltage VDHC Voltage CDHC Voltage ...
Page 6
Symbol Parameter Switching Characteristics t IOUT Rising Edge Phase Delay pd_H T IOUT Rise Time r Output Current V IREF pin Voltage IREF I Constant Current Sink of 20mA OUT20 I Constant Current Sink of 40mA OUT40 I Output Current ...
Page 7
Typical Performance Characteristics 18V 54.7 kΩ 5V, V IREF EN MODE the LM3432 and LM3432B unless otherwise indicated. Quiescent Current vs Supply Voltage VCC Regulator Output vs Supply Voltage Average String Current vs Current Setting Resistance ...
Page 8
PWM Dimming Frequency vs C PWM Dimming Characteristic, Rising Edge (Channel 1 Waveform) Analog Dimming Operation www.national.com PWM Digital Dimming Operation MODE 30006409 PWM Dimming Characteristic, Falling Edge 30006411 30006413 8 (Channel 1 Waveform) 30006410 (Channel 1 Waveform) 30006412 ...
Page 9
Simplified Functional Block Diagram 9 30006415 www.national.com ...
Page 10
Functional Description OVERVIEW The LM3432/LM3432B are 6-channel high voltage current regulators for LED backlight applications which incorporates individual channel current regulators to give accurate current sinking for each LED string. String to string tolerance is kept within ±2. ...
Page 11
Therefore, 0.5µs becomes LED SHORT FAULT DETECT ...
Page 12
... To use the DHC function, connect a gain setting resistor from the VDHC pin of the LM3432/LM3432B to the VDHC pin of the LM3430 (National Semiconductor’s Boost Controller for LED Backlighting) that is supplying power to the LED rails. The LM3432/LM3432B’s DHC function will regulate the volt- age between the IOUT pins and ground to a minimum of 0 ...
Page 13
Applications Information The LM3432/LM3432B provide a simple and handy solution for LED driving. With only a few external passive components, FIGURE 4. Typical Application Schematic to Drive 72 White LEDs (@20 mA) (PWM Digital Dimming) DETERMINATION OF EXTERNAL COMPONENTS The ...
Page 14
Selecting the VIN Capacitor, C VIN The purpose of this capacitor is to supply transient current to the device and suppress VIN noise in order to ensure proper operation. A low ESR ceramic capacitor with good high fre- quency performance ...
Page 15
FIGURE 5. Achieving Higher LED String Current by Grouping IOUT Ports Dynamic Headroom Control, DHC with LM3430 When the LM3432/LM3432B are powered with National Semiconductor's Boost Controller for LED Backlighting, LM3430, the Dynamic Headroom Control (DHC) feature helps to provide ...
Page 16
FIGURE 6. LM3430 + LM3432/LM3432B Application Schematic with Dynamic Headroom Control Enabled www.national.com 16 30006428 ...
Page 17
Physical Dimensions inches (millimeters) unless otherwise noted 24-Lead LLP Package NS Package Number SQA24B 28-Lead eTSSOP Package NS Package Number MXA28A 17 www.national.com ...
Page 18
... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...