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LT3746
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C, unless otherwise noted.
I LED31
20mA/DIV
V OUT
2V/DIV
V LED31
2VDIV
V PWMCK
5V/DIV
100Hz 8:1 GS Dimming
I LED31
20mA/DIV
V OUT
2V/DIV
V LED31
2VDIV
V PWMCK
5V/DIV
100Hz 4096:1 GS Dimming
I LED31
20mA/DIV
V OUT
2V/DIV
V LED31
2VDIV
V PWMCK
5V/DIV
500Hz 4096:1 GS Dimming
5ms/DIV
3746 G01
500ns/DIV
3746 G02
500ns/DIV
3746 G03
I LED31
20mA/DIV
CIRCUIT OF FIGURE 7:
DC 31 = 0×20,
GS 31 = 0×200
200Hz Two-Level DC Dimming
I LED31
20mA/DIV
CIRCUIT OF FIGURE 7:
DC 31 = 0×20,
GS 31 = 0×001
200Hz Four-Level DC Dimming
V OUT
0.2V/DIV
CIRCUIT OF FIGURE 7:
DC 31 = 0×20,
GS 31 = 0×001
Adaptive LED Bus Voltage I
V OUT
2V/DIV
V LED31
2VDIV
V SCKI
5V/DIV
(A) (B) (C)
(A) (B) (C)
V OUT
2V/DIV
V LED31
2VDIV
V SCKI
5V/DIV
(A)
(B)
(C)
(D)
I L
0.5A/DIV
I LOAD
0.5A/DIV
1ms/DIV
3746 G04
0.5ms/DIV
3746 G05
2ms/DIV
3746 G06
V OUT
0.2V/DIV
I L
0.5A/DIV
I LOAD
0.5A/DIV
CIRCUIT OF FIGURE 7:
(A) EN = 1, GS 31 = 0×FF;
(B) EN = 1, DC 31 = 0×3F;
(C) EN = 1, DC 31 = 0×00
Adaptive LED Bus Voltage II
V OUT
0.2V/DIV
I L
0.5A/DIV
I LOAD
0.5A/DIV
CIRCUIT OF FIGURE 7:
(A) EN = 0, GS 31 = 0×FFF,
(B) EN = 1, DC 31 = 0×3F,
(C) EN = 1, DC 31 = 0×00
(D) EN = 1, DC 31 = 0×20
Adaptive LED Bus Voltage III
V OUT
0.2V/DIV
I L
0.5A/DIV
I LOAD
0.5A/DIV
CIRCUIT OF FIGURE 7:
DC 00-31 = 0×3F,
GS 00-31 = 0×FFF
Adaptive LED Bus Voltage IV
2ms/DIV
3746 G07
2ms/DIV
3746 G08
2ms/DIV
3746 G09
CIRCUIT OF FIGURE 7:
DC 00-31 = 0×20,
GS 00-31 = 0×800
CIRCUIT OF FIGURE 7:
DC 00-31 = 0×3F, GS 00-03 = 0×1FF, GS 04-07 = 0×3FF,
GS 08-11 = 0×5FF, GS 12-15 = 0×7FF, GS 16-19 = 0×9FF,
GS 20-23 = 0×BFF, GS 24-27 = 0×DFF, GS 28-31 = 0×FFF
For more information www.linear.com/3746
CIRCUIT OF FIGURE 7:
DC 00-07 = 0×3F, GS 00-07 = 0×3FF, DC 08-15 = 0×2F,
GS 08-15 = 0×7FF, DC 16-23 = 0×1F, DC 16-23 = 0×BFF,
DC 24-31 = 0×0F, GS 24-31 = 0×FFF
3746fa
7
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