LT3745 데이터 시트보기 (PDF) - Linear Technology
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LT3745 Datasheet PDF : 28 Pages
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LT3745
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
100Hz 8:1 GS Dimming
100Hz 4096:1 GS Dimming
500Hz 4096:1 GS Dimming
ILED15
50mA/DIV
VOUT
2V/DIV
VLED15
2V/DIV
VPWMCK
5V/DIV
5ms/DIV
CIRCUIT OF FIGURE 7:
DC15 = 0×20
GS15 = 0×200
3745 G01
ILED15
50mA/DIV
VOUT
2V/DIV
VLED15
2V/DIV
VPWMCK
5V/DIV
500ns/DIV
CIRCUIT OF FIGURE 7:
DC15 = 0×20
GS15 = 0×001
3745 G02
ILED15
50mA/DIV
VOUT
2V/DIV
VLED15
2V/DIV
VPWMCK
5V/DIV
500ns/DIV
CIRCUIT OF FIGURE 7:
DC15 = 0×20
GS15 = 0×001
3745 G03
200Hz Two-Level DC Dimming
200Hz Four-Level DC Dimming
Adaptive LED Bus Voltage I
ILED15
50mA/DIV
VOUT
2V/DIV
VLED15
2V/DIV
VSCKI
5V/DIV
(a) (b) (c)
(a) (b) (c)
1ms/DIV
3745 G04
CIRCUIT OF FIGURE 7:
(a) EN = 1, GS15 = 0×FFF (c) EN = 1, DC15 = 0×00
(b) EN = 1, DC15 = 0×3F
ILED15
50mA/DIV
VOUT
2V/DIV
VLED15
2V/DIV
VSCKI
5V/DIV
(a)
(b)
(c)
(d)
0.5ms/DIV
3745 G05
CIRCUIT OF FIGURE 7:
(a) EN = 0, GS15 = 0×FFF (c) EN = 1, DC15 = 0×00
(b) EN = 1, DC15 = 0×3F (d) EN = 1, DC15 = 0×20
VOUT
0.5V/DIV
IL
0.5A/DIV
2ms/DIV
CIRCUIT OF FIGURE 7:
DC00-15 = 0×3F, GS00-15 = 0×FFF
3745 G06
Adaptive LED Bus Voltage II
VOUT
0.5V/DIV
Adaptive LED Bus Voltage III
VOUT
0.5V/DIV
Adaptive LED Bus Voltage IV
VOUT
0.5V/DIV
IL
0.5A/DIV
2ms/DIV
CIRCUIT OF FIGURE 7:
DC00-15 = 0×20, GS00-15 = 0×800
IL
0.5A/DIV
IL
0.5A/DIV
3745 G07
2ms/DIV
3745 G08
CIRCUIT OF FIGURE 7:
DC00-15 = 0×3F, GS00-01 = 0×1FF, GS02-03 = 0×3FF,
GS04-05 = 0×5FF, GS06-07 = 0×7FF, GS08-09 = 0×9FF,
GS10-11 = 0×BFF, GS12-13 = 0×DFF, GS14-15 = 0×FFF
2ms/DIV
3745 G09
CIRCUIT OF FIGURE 7:
DC00-03 = 0×3F, GS00-03 = 0×3FF, DC04-07 = 0×2F,
GS04-07 = 0×7FF, DC08-11 = 0×1F, GS08-11 = 0×BFF,
DC12-15 = 0×0F, GS12-15 = 0×FFF
3745f
7
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