LM3532TMX-40ANOPB National Semiconductor Corporation, LM3532TMX-40ANOPB Datasheet - Page 36

• Manufacturer Part Number: LM3532TMX-40ANOPB
• Description: High Efficiency White Led Driver With Programmable Ambient Light Sensing Capability And I2c-compatible Interface
• Manufacturer: National Semiconductor Corporation

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Applications Information
INDUCTOR SELECTION
The LM3532 is designed to work with a 10 µH to 22 µH in-
ductor. When selecting the inductor, ensure that the satura-
tion rating is high enough to accommodate the applications
peak inductor current . The inductance value must also be
large enough so that the peak inductor current is kept below
CAPACITOR SELECTION
The LM3532’s output capacitor has two functions: filtering of
the boost converter's switching ripple, and to ensure feedback
loop stability. As a filter, the output capacitor supplies the LED
current during the boost converter's on time and absorbs the
inductor's energy during the switch's off time. This causes a
sag in the output voltage during the on time and a rise in the
output voltage during the off time. Because of this, the output
Manufacturer
Murata
Murata
TDK
Manufacturer
Coilcraft
Coilcraft
Coilcraft
Coilcraft
Coilcraft
Coilcraft
TDK
TDK
TDK
TDK
TDK
TDK
TDK
Part Number
VLS252010T-100M
VLS2012ET-100M
VLF301512MT-100M
VLF4010ST-100MR80
VLS252012T-100M
VLF3014ST-100MR82
VLF4014ST-100M1R0
XPL2010-103ML
LPS3010-103ML
LPS4012-103ML
LPS4012-223ML
LPS4018-103ML
LPS4018-223ML
Part Number
GRM21BR71H105KA12
GRM188B31A225KE33
C1608X5R0J225
TABLE 21. Input/Output Capacitors
TABLE 20. Inductors
Value
10 µH
10 µH
10 µH
10 µH
10 µH
10 µH
10 µH
10 µH
10 µH
10 µH
22 µH
10 µH
22 µH
36
2.2 µF
2.2 µF
Value
1 µF
the LM3532's switch current limit. See the
PUT POWER
inductors that can be used with the LM3532. The inductors
with higher saturation currents are more suitable for applica-
tions with higher output currents or voltages (multiple strings).
The smaller devices are geared toward single string applica-
tions with lower series LED counts.
capacitor must be sized large enough to filter the inductor
current ripple that could cause the output voltage ripple to
become excessive. As a feedback loop component, the out-
put capacitor must be at least 1µF and have low ESR; other-
wise, the LM3532's boost converter can become unstable.
This requires the use of ceramic output capacitors.
lists part numbers and voltage ratings for different output ca-
pacitors that can be used with the LM3532.
2 mm × 2 mm
mm × 1.4 mm
2.95 mm × 0.9
mm × 1.1 mm
mm × 1.7 mm
mm × 1.7 mm
3.0 mm × 2.5
mm × 1.2mm
mm × 1.2mm
mm × 1.4mm
3.8 mm × 3.6
3.9 mm × 3.9
3.9 mm × 3.9
3.9 mm × 3.9
mm × 1 mm
mm × 1 mm
mm × 1 mm
2.5 mm × 2
2.8 mm × 3
2.5 mm × 2
2.8 mm × 3
1.9 mm × 2
2.95 mm ×
× 1.2 mm
3.9mm ×
3.9mm ×
1.1mm
Size
mm
0805
0805
0603
Size
Section for more details.
1000 mA
1000 mA
1100 mA
Current
590 mA
695 mA
690 mA
800 mA
810 mA
820 mA
610 mA
550 mA
780 mA
700 mA
Rating
Rating
6.3V
50V
10V
DC Resistance
Table 20
0.712Ω
0.47Ω
0.25Ω
0.25Ω
0.63Ω
0.25Ω
0.22Ω
0.56Ω
0.54Ω
0.35Ω
0.36Ω
MAXIMUM OUT-
Description
0.6Ω
0.2Ω
COUT
CIN
CIN
lists various
Table 21