LM3432BSQE/NOPB National Semiconductor, LM3432BSQE/NOPB Datasheet - Page 15
![IC LED DRIVER LINEAR 24-LLP](/photos/6/99/69987/pkg_sqa24b_sml.jpg)
LM3432BSQE/NOPB
Manufacturer Part Number
LM3432BSQE/NOPB
Description
IC LED DRIVER LINEAR 24-LLP
Manufacturer
National Semiconductor
Type
Linear (Non-Switching)r
Datasheet
1.LM3432BSQENOPB.pdf
(18 pages)
Specifications of LM3432BSQE/NOPB
Constant Current
Yes
Topology
PWM, Step-Up (Boost)
Number Of Outputs
6
Internal Driver
Yes
Type - Primary
Backlight, General Purpose
Type - Secondary
White LED
Voltage - Supply
6 V ~ 40 V
Voltage - Output
80V
Mounting Type
Surface Mount
Package / Case
24-LLP
Operating Temperature
-40°C ~ 125°C
Current - Output / Channel
40mA
Internal Switch(s)
Yes
No. Of Outputs
6
Output Current
240mA
Output Voltage
80V
Input Voltage
6V To 40V
Dimming Control Type
PWM
Operating Temperature Range
-40°C To +125°C
Driver Case Style
LLP
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Frequency
-
Efficiency
-
Other names
LM3432BSQETR
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 the optimal system efficiency. By connecting
VDHC through a gain setting resistor to the DHC pin of the
LM3430 that is supplying the LED power rail, the LM3432/
LM3432B’s DHC function will regulate the minimum of the ON
voltage of the six channels to 0.625V typical (I
This is the minimum voltage headroom required at outputs to
keep the current regulator in its linear operating range. In or-
der not to interfere with the feedback loop response of the
upstream DC-DC converter, the DHC response time constant
FIGURE 5. Achieving Higher LED String Current by Grouping IOUT Ports
OUT
= 20 mA).
15
must be set to a large enough value by adding a capacitor
from CDHC pin to ground.
Figure 6 is an application schematic of a LED panel driver
using both the LM3430 and the LM3432/LM3432B with the
Dynamic Headroom Control function enabled. The LM3430
boosts a voltage from VIN to 50V nominal to supply the LED
strings. With the DHC function disabled, the LM3430 will keep
the LED string supply regulated at 50V. When the DHC is
enabled, this voltage will dynamically be regulated down to a
voltage that can just keep all LED string currents in regulation.
That is about 40V in the application shown in Figure 6. The
reduction in this rail voltage can significantly improve the
overall system efficiency.
www.national.com
30006427