LM3450 Datasheet, PDF (8/40 Pages) National Semiconductor (TI) – LED Driver with Active Power Factor Correction and Phase Dimming Decoder

LM3450
SNVS681D – NOVEMBER 2010 – REVISED MAY 2013
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TYPICAL PERFORMANCE CHARACTERISTICS (continued)
T_A=+25°C and V_CC = 14V unless otherwise specified
Transconductance vs. V_FB
250
Current Sense Threshold vs. V_COMP and V_AC
4.90
VAC = 4V
200
3.92
VAC = 3V
150
100
50
0
1.5
2.94
VAC = 2V
2.0
2.5
3.0
3.5
VFB (V)
Figure 14.
1.96
VAC = 1V
0.98
VAC = 0.5V
VAC = 0.1V
0.00
1.0 1.8 2.6 3.4 4.2 5.0
VCMP (V)
Figure 15.
Decoder Mapping from V_AC to DIM
1.0
0.8
0.5V
0.6
0.4
1V1.5V
0.2
2V
2.5V
0.0
VADJ=3V
-0.2
0.0 0.2 0.4 0.6 0.8 1.0
DEMODULATED VAC PIN DUTY CYCLE
Figure 16.
8
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