User manual

80 90 100 110 120 130 140
0.0
0.2
0.4
0.7
0.8
1.0
I
LED
(A)
LINE VOLTAGE (V
RMS
)
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
LED
(A)
LINE VOLTAGE (V
RMS
)
Original
Mod A
Mod B
Mod C
80 90 100 110 120 130 140
72
74
76
78
80
82
EFFICIENCY (%)
LINE VOLTAGE (V
RMS
)
4 LEDs
6 LEDs
8 LEDs
80 90 100 110 120 130 140
72
74
76
78
80
82
EFFICIENCY (%)
LINE VOLTAGE (V
RMS
)
Mod C
Mod A
Mod B
Original
www.ti.com Typical Performance Characteristics
10 Typical Performance Characteristics
Original Circuit: R14 = 1.50Ω; Modification A: R14 = 1.20Ω; Modification B: R14 = 1.00Ω; Modification C:
R14 = 0.75Ω
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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