LM3432BSQE/NOPB National Semiconductor, LM3432BSQE/NOPB Datasheet - Page 13
![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
Applications Information
The LM3432/LM3432B provide a simple and handy solution
for LED driving. With only a few external passive components,
DETERMINATION OF EXTERNAL COMPONENTS
The typical application only requires three external compo-
nents. The selection of those components is described in
detail below.
Programming of String Current, IOUT1 to IOUT6
The string current can be programmed by an external resistor,
R
is shown below.
In order to ensure good current regulation over the full oper-
ating temperature range, a high quality resistor with ±1%
tolerance and a low temperature coefficient is recommended.
IREF
. The equation to calculate the resistance of this resistor
FIGURE 4. Typical Application Schematic to Drive 72 White LEDs (@20 mA) (PWM Digital Dimming)
13
an LED panel of up to about 120 white LEDs can be illumi-
nated. A typical application configuration driving six strings
with twelve white LEDs per string is shown in Figure 4.
For the example shown in Figure 4, the string current is 20
mA. Applying to the equation:
Selecting the VCC Output Capacitor, C
For proper operation, a VCC output capacitor (C
least 680 nF is required for stability reason. The recommend-
ed C
VCC
capacitance is 1 µF.
VCC
www.national.com
VCC
30006421
) of at