User manual

50
60
70
80
90
100
8 10 12 14 16 18
EFFICIENCY (%)
INPUT VOLTAGE (V)
400 Ps/DIV
VC1
2V/Div
DLY
1V/Div
Iout
500 mA/Div
0
100:1
200:1
300:1
400:1
500:1
600:1
700:1
0 200 400 600 800 1000 1200
DIMMING FREQUENCY (Hz)
MAX CONTRAST RATIO
1 ms/DIV
VA
10V/Div
VIN
10V/Div
SS/SH
1V/Div
ILED
50 mA/Div
www.ti.com Typical Evaluation Board Performance
6 Typical Evaluation Board Performance
Unless otherwise specified, the following conditions apply: Vin = 12V, Ta = 25°C, LED array = 4 parallel
strings of 8 LEDs at 140mA per string. LED part number: Nichia NFSW036BT.
Figure 3. Maximum Contrast Ratio vs. Dimming Figure 4. Power-On Startup Waveforms
Frequency
Figure 5. Fault Delay Waveforms Figure 6. Efficiency vs. Input Voltage
(one LED open)
7
SNVA309A–January 2008–Revised May 2013 AN-1764 LM3431 Evaluation Board
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