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
76
78
80
82
84
86
EFFICIENCY (%)
LINE VOLTAGE (V
RMS
)
4 LEDs
6 LEDs
8 LEDs
80 90 100 110 120 130 140
76
78
80
82
84
86
EFFICIENCY (%)
LINE VOLTAGE (V
RMS
)
Mod C
Mod A
Mod B
Original
Typical Performance Characteristics www.ti.com
10 Typical Performance Characteristics
Original Circuit: R14 = 1.50Ω; Modification A: R14 = 1.21Ω; Modification B: R14 = 1.00Ω; Modification C:
R14 = 0.75Ω
Figure 5. Efficiency vs Line Voltage Figure 6. Efficiency vs. Line Voltage
Original Circuit Modified Circuits
Figure 7. LED Current vs. Line Voltage Figure 8. LED Current vs. Line Voltage
Original Circuit Modified Circuits
8
AN-2082 LM3444 -120VAC, 8W Isolated Flyback LED Driver SNVA454E–September 2010–Revised May 2013
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