LTC1698 查看數據表（PDF） - Linear Technology
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LTC1698 Datasheet PDF : 24 Pages
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LTC1698
TYPICAL PERFOR A CE CHARACTERISTICS
IVDD vs SYNC Frequency
50
VDD = 8V
45 TA = 25°C
CFG = CCG = 4700pF
40
CFG = CCG = 3300pF
35
CFG = CCG = 2200pF
30
25
20
15
10
CFG = CCG = 1000pF
5
0
50 100 150 200 250 300 350 400 450 500
fSYNC (kHz)
1698 G19
Opto Driver Short-Circuit Current
vs VDD
0
TA = 25°C
VOPTODRV = 1.233V
–10
–20
–30
–40
–50
5 6 7 8 9 10 11 12 13 14
VDD (V)
1698 G17
Driver Rise, Fall and Propagation
Delay vs Driver Load
90
VDD = 8V
80 TA = 25°C
70
CG, FG tPLH
60
50
tf tr
40
CG, FG tPHL
30
20
10
0
0
2000 4000 6000 8000 10000
DRIVER LOAD (pF)
1698 G25
SYNC Positive Threshold
vs Temperature
2.25
VDD = 8V
2.00
SYNC Positive Threshold
vs VDD
2.20
TA = 25°C
1.96
1.75
1.72
1.50
1.48
1.25
1.24
1.00
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1698 G20
1.00
5 6 7 8 9 10 11 12 13 14
VDD (V)
1698 G21
IVDD vs VDD
20
TA = 25°C
18 fSYNC = 100kHz
CFG = CCG = 4700pF
16
CFG = CCG = 3300pF
14
12
10
8
6
CFG = CCG = 2200pF
4
CFG = CCG = 1000pF
2
0
5 6 7 8 9 10 11 12 13 14
VDD (V)
1698 G18
Undervoltage Lockout Threshold
vs Temperature
5
4
3
2
1
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1698 G24
SYNC Input to Driver Output Delay
vs Temperature
90
VDD = 8V
80 CCG = CFG = 1000pF
fSYNC = 100kHz
70
60
50
CG, FG tPLH
40
CG, FG tPHL
30
20
10
0
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1698 G26
Driver Disable Time-Out vs SYNC
Frequency
30 VDD = 8V
2.2
TA = 25°C
25
2.0
20
tDISS × fSYNC
1.8
15
1.6
10
1.4
tDISS
5
1.2
0
1.0
50 100 150 200 250 300 350 400 450 500
fSYNC (kHz)
1698 G27
1698f
6
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