LM3429BKBSTEVAL/NOPB National Semiconductor, LM3429BKBSTEVAL/NOPB Datasheet - Page 8
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LM3429BKBSTEVAL/NOPB
Manufacturer Part Number
LM3429BKBSTEVAL/NOPB
Description
BOARD EVAL FOR BUCK-BOOST LM3429
Manufacturer
National Semiconductor
Series
PowerWise®r
Specifications of LM3429BKBSTEVAL/NOPB
Current - Output / Channel
1A
Outputs And Type
1, Non-Isolated
Features
Dimmable
Voltage - Input
10 ~ 70 V
Utilized Ic / Part
LM3429
Core Chip
LM3429
Topology
Buck-Boost
No. Of Outputs
1
Dimming Control Type
PWM / Analog
Development Tool Type
Hardware - Eval/Demo Board
Mcu Supported Families
LM3429 Family
Lead Free Status / RoHS Status
Lead free by exemption / RoHS compliant by exemption
Voltage - Output
-
Other names
*LM3429BKBSTEVAL
*LM3429BKBSTEVAL/NOPB
LM3429BKBSTEVAL
*LM3429BKBSTEVAL/NOPB
LM3429BKBSTEVAL
www.national.com
Typical Waveforms
T
Alternate Designs
Alternate designs with the LM3429 evaluation board are pos-
sible with very few changes to the existing hardware. The
evaluation board FETs and diodes are already rated higher
than necessary for design flexibility. The input UVLO, output
OVP, input and output capacitance can remain the same for
Specification /
Component
V
V
f
I
R9
R10
L1
SW
LED
A
IN
O
= +25°C, V
IN
TP1 switch node voltage (V
= 24V and V
STANDARD OPERATION
LED current (I
Design 1
10V - 45V
14V
600kHz
2A
0.05Ω
41.2 kΩ
22µH
O
= 21V.
LED
)
SW
)
Design 2
15V - 50V
21V
700kHz
500mA
0.2Ω
35.7 kΩ
68µH
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8
the designs shown below. These alternate designs can be
evaluated by changing only R9, R10, and L1.
The table below gives the main specifications for four different
designs and the corresponding values for R9, R10, and L1.
PWM dimming can be evaluated with any of these designs.
Design 3
20V - 55V
28V
500kHz
2.5A
0.04Ω
49.9 kΩ
15µH
200Hz 50% PWM DIMMING
TP11 dim voltage (V
LED current (I
LED
Design 4
25V - 60V
35V
700kHz
1.25A
0.08Ω
35.7 kΩ
33µH
)
DIM
)
30100860