LM3429BSTEVAL/NOPB National Semiconductor, LM3429BSTEVAL/NOPB Datasheet - Page 8

• Manufacturer Part Number: LM3429BSTEVAL/NOPB
• Description: BOARD EVAL FOR BOOST LM3429
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LM3429BSTEVAL/NOPB

• Current - Output / Channel: 1A
• Outputs And Type: 1, Non-Isolated
• Features: Dimmable
• Voltage - Input: 10 ~ 26 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
• Msl: MSL 1 - Unlimited
• Lead Free Status / RoHS Status: Lead free by exemption / RoHS compliant by exemption
• Voltage - Output: -
• Other names: *LM3429BSTEVAL; *LM3429BSTEVAL/NOPB; LM3429BSTEVAL

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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
14V
600kHz
2A
0.05Ω
41.2 kΩ
22µH
O
= 31.5V.
LED
)
SW
)
Design 2
15V
21V
700kHz
500mA
0.2Ω
35.7 kΩ
68µH
30100959
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
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
35V
700kHz
1.25A
0.08Ω
35.7 kΩ
33µH
)
DIM
)
30100960