Texas Instruments LM3445 Evaluation Board LM3445-120VFLBK/NOPB LM3445-120VFLBK/NOPB Benutzerhandbuch
Produktcode
LM3445-120VFLBK/NOPB
80
90
100
110
120
130
140
0.0
0.2
0.4
0.7
0.8
1.0
I L
ED
(A)
LINE VOLTAGE (VRMS)
4 LEDs
6 LEDs
8 LEDs
80
90
100
110
120
130
140
0.0
0.2
0.4
0.7
0.8
1.0
I L
ED
(A
)
LINE VOLTAGE (VRMS)
Original
Mod A
Mod B
Mod C
80
90
100
110
120
130
140
72
74
76
78
80
82
EF
F
IC
IEN
C
Y (%
)
LINE VOLTAGE (VRMS)
4 LEDs
6 LEDs
8 LEDs
80
90
100
110
120
130
140
72
74
76
78
80
82
EF
F
IC
IEN
C
Y
(%
)
LINE VOLTAGE (VRMS)
Mod C
Mod A
Mod B
Original
Typical Performance Characteristics
10
Typical Performance Characteristics
Original Circuit: R14 = 1.50
Ω
; Modification A: R14 = 1.20
Ω
; Modification B: R14 = 1.00
Ω
; Modification C:
R14 = 0.75
Ω
Figure 8. Efficiency vs. Line Voltage
Figure 9. Efficiency vs. Line Voltage
Original Circuit
Modified Circuits
Figure 10. LED Current vs. Line Voltage
Figure 11. LED Current vs. Line Voltage
Original Circuit
Modified Circuits
11
SNVA429C – August 2010 – Revised May 2013
AN-2034 LM3445 -120VAC, 8W Isolated Flyback LED Driver
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