Datasheet

LT3746
7
3746fa
For more information www.linear.com/3746
Typical perForMance characTerisTics
200Hz Two-Level DC Dimming 200Hz Four-Level DC Dimming Adaptive LED Bus Voltage I
Adaptive LED Bus Voltage II Adaptive LED Bus Voltage III
Adaptive LED Bus Voltage IV
100Hz 8:1 GS Dimming 100Hz 4096:1 GS Dimming 500Hz 4096:1 GS Dimming
T
A
= 25°C, unless otherwise noted.
CIRCUIT OF FIGURE 7:
DC
31
= 0×20,
GS
31
= 0×200
V
PWMCK
5V/DIV
V
LED31
2VDIV
V
OUT
2V/DIV
I
LED31
20mA/DIV
5ms/DIV
3746 G01
CIRCUIT OF FIGURE 7:
DC
31
= 0×20,
GS
31
= 0×001
V
PWMCK
5V/DIV
V
LED31
2VDIV
V
OUT
2V/DIV
I
LED31
20mA/DIV
500ns/DIV
3746 G02
CIRCUIT OF FIGURE 7:
DC
31
= 0×20,
GS
31
= 0×001
V
PWMCK
5V/DIV
V
LED31
2VDIV
V
OUT
2V/DIV
I
LED31
20mA/DIV
500ns/DIV
3746 G03
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
V
SCKI
5V/DIV
V
LED31
2VDIV
V
OUT
2V/DIV
I
LED31
20mA/DIV
1ms/DIV
(A) (B) (C) (A) (B) (C)
3746 G04
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
V
SCKI
5V/DIV
V
LED31
2VDIV
V
OUT
2V/DIV
I
LED31
20mA/DIV
0.5ms/DIV
(A) (B) (C) (D)
3746 G05
CIRCUIT OF FIGURE 7:
DC
00-31
= 0×3F,
GS
00-31
= 0×FFF
I
LOAD
0.5A/DIV
I
L
0.5A/DIV
V
OUT
0.2V/DIV
2ms/DIV
3746 G06
CIRCUIT OF FIGURE 7:
DC
00-31
= 0×20,
GS
00-31
= 0×800
I
LOAD
0.5A/DIV
I
L
0.5A/DIV
V
OUT
0.2V/DIV
2ms/DIV
3746 G07
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
I
LOAD
0.5A/DIV
I
L
0.5A/DIV
V
OUT
0.2V/DIV
2ms/DIV
3746 G08
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
I
LOAD
0.5A/DIV
I
L
0.5A/DIV
V
OUT
0.2V/DIV
2ms/DIV
3746 G09