Texas Instruments LM3431 Evaluation Board LM3431EVAL/NOPB LM3431EVAL/NOPB Datenbogen
Produktcode
LM3431EVAL/NOPB
ILED
5 mA/Div
Vcathode
100 mV/Div
REFIN
10 mV/Div
1 Ps/DIV
400 ns/DIV
ILED
50 mA/Div
NDRV (FET)
2V/Div
NDRV (NPN)
1V/Div
DIM
5V/Div
Vout
100 mV/Div
Vsw
20V/Div
ILED
200 mA/Div
400 Ps/DIV
200 Ps/DIV
Vout
200 mV/Div
ILED
5 mA/Div
VIN
5V/Div
N
O
R
M
A
L
IZ
ED
F
R
EQ
U
EN
C
Y
0.94
0.96
0.98
1.00
1.02
1.04
-40 -20
0
20
40
60
80 100 120 140
TEMPERATURE (°C)
INPUT VOLTAGE (V)
E
F
F
IC
IEN
C
Y
(%
)
50
60
70
80
90
100
5
9
13
17
21
100%
dimming duty
10%
50%
SNVS547G – NOVEMBER 2007 – REVISED MAY 2013
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise specified the following conditions apply: V
IN
= 12V, T
J
= 25°C.
Efficiency vs. Input Voltage LED Current = 140 mA x 3, LED
Normalized Switching Frequency vs. Temperature (700 kHz)
Vf = 25V
Figure 8.
Figure 9.
Line Transient Response
Dimming Transient Response
Figure 10.
Figure 11.
LED Ripple Current
NDRV Waveforms
Figure 12.
Figure 13.
Copyright © 2007–2013, Texas Instruments Incorporated
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