Texas Instruments LM3401 Hysteretic PFET Controller for High Power LED Drive Evaluation Module LM3401EVAL/NOPB LM3401EVAL/NOPB Datenbogen
Produktcode
LM3401EVAL/NOPB
60
65
70
75
80
85
90
95
100
0
5
10
15
20
25
30
35
INPUT VOLTAGE (V)
EF
F
IC
IEN
C
Y
(%
)
1 series (700 mA)
2 series (700 mA)
1 series (1A)
12Vin
1:1
10:1
100:1
1000:1
10k:1
0.1
1
10
DIMMING FREQUENCY (kHz)
M
A
XI
MU
M
C
O
N
T
R
A
ST
R
A
T
IO
24Vin
60
65
70
75
80
85
90
95
100
0
5
10
15
20
25
30
35
INPUT VOLTAGE (V)
EF
F
IC
IEN
C
Y
(%
)
1 series
2 series
3 series
4 Ps/DIV
VIN
5V/DIV
VCS
10V/DIV
ILED
100 mA/DIV
0
100
200
300
400
500
600
700
800
0
5
10
15
20
25
30
35
INPUT VOLTAGE (V)
SW
IT
C
H
IN
G
F
R
EQ
U
EN
C
Y
(kH
z
)
1 LED
2 Series LEDs
ILED
100 mA/DIV
2 Ps/DIV
VCS
20V/DIV
VDIM
2V/DIV
Typical Performance Characteristics
Figure 5. Switching Frequency vs VIN
Figure 6. Dimming Waveforms
Figure 7. Startup Waveforms
Figure 8. Efficiency vs Input Voltage
Driving 350 mA LEDs
Figure 9. Efficiency vs Input Voltage
Figure 10. Maximum Contrast Ratio vs Dimming
Driving 700 mA and 1A LEDs
Frequency (100:1 = 1% duty)
6
AN-1657 LM3401 Demo Board
SNVA254C – August 2007 – Revised April 2013
Copyright © 2007–2013, Texas Instruments Incorporated