Datasheet

LT3745
7
3745f
Typical perForMance characTerisTics
200Hz Tw o -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
15
= 0×20
GS
15
= 0×001
V
PWMCK
5V/DIV
V
LED15
2V/DIV
V
OUT
2V/DIV
I
LED15
50mA/DIV
500ns/DIV
3745 G03
CIRCUIT OF FIGURE 7:
(a) EN = 1, GS
15
= 0×FFF (c) EN = 1, DC
15
= 0×00
(b) EN = 1, DC
15
= 0×3F
V
SCKI
5V/DIV
V
LED15
2V/DIV
V
OUT
2V/DIV
I
LED15
50mA/DIV
1ms/DIV
3745 G04
(a) (b) (c) (a) (b) (c)
CIRCUIT OF FIGURE 7:
(a) EN = 0, GS
15
= 0×FFF (c) EN = 1, DC
15
= 0×00
(b) EN = 1, DC
15
= 0×3F (d) EN = 1, DC
15
= 0×20
V
SCKI
5V/DIV
V
LED15
2V/DIV
V
OUT
2V/DIV
I
LED15
50mA/DIV
0.5ms/DIV
3745 G05
(a) (b) (c) (d)
CIRCUIT OF FIGURE 7:
DC
00-15
= 0×3F, GS
00-15
= 0×FFF
I
L
0.5A/DIV
V
OUT
0.5V/DIV
2ms/DIV
3745 G06
CIRCUIT OF FIGURE 7:
DC
00-15
= 0×20, GS
00-15
= 0×800
I
L
0.5A/DIV
V
OUT
0.5V/DIV
2ms/DIV
3745 G07
CIRCUIT OF FIGURE 7:
DC
00-15
= 0×3F, GS
00-01
= 0×1FF, GS
02-03
= 0×3FF,
GS
04-05
= 0×5FF, GS
06-07
= 0×7FF, GS
08-09
= 0×9FF,
GS
10-11
= 0×BFF, GS
12-13
= 0×DFF, GS
14-15
= 0×FFF
I
L
0.5A/DIV
V
OUT
0.5V/DIV
2ms/DIV
3745 G08
CIRCUIT OF FIGURE 7:
DC
00-03
= 0×3F, GS
00-03
= 0×3FF, DC
04-07
= 0×2F,
GS
04-07
= 0×7FF, DC
08-11
= 0×1F, GS
08-11
= 0×BFF,
DC
12-15
= 0×0F, GS
12-15
= 0×FFF
I
L
0.5A/DIV
V
OUT
0.5V/DIV
2ms/DIV
3745 G09
CIRCUIT OF FIGURE 7:
DC
15
= 0×20
GS
15
= 0×200
V
PWMCK
5V/DIV
V
LED15
2V/DIV
V
OUT
2V/DIV
I
LED15
50mA/DIV
5ms/DIV
3745 G01
CIRCUIT OF FIGURE 7:
DC
15
= 0×20
GS
15
= 0×001
V
PWMCK
5V/DIV
V
LED15
2V/DIV
V
OUT
2V/DIV
I
LED15
50mA/DIV
500ns/DIV
3745 G02