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LTC1698IGN Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1698IGN
Description  Isolated Secondary Synchronous Rectifier Controller
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1698IGN Datasheet(HTML) 6 Page - Linear Technology

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LTC1698
1698f
TYPICAL PERFOR A CE CHARACTERISTICS
IVDD vs SYNC Frequency
fSYNC (kHz)
50
30
40
50
450
1698 G19
20
10
25
35
45
15
5
0
150
100
250
200
350 400
300
500
VDD = 8V
TA = 25°C
CFG = CCG = 4700pF
CFG = CCG = 3300pF
CFG = CCG = 2200pF
CFG = CCG = 1000pF
TEMPERATURE (
°C)
–50
2.00
2.25
25
75
150
1698 G20
1.75
1.50
1.25
1.00
–25
0
50
100 125
VDD = 8V
VDD (V)
5
1.00
1.24
1.72
1.96
2.20
7
9
10
14
1698 G21
1.48
68
11
12
13
TA = 25°C
SYNC Positive Threshold
vs Temperature
SYNC Positive Threshold
vs VDD
Undervoltage Lockout Threshold
vs Temperature
TEMPERATURE (
°C)
–50
3
4
5
25
75
150
1698 G24
2
1
0
–25
0
50
100 125
IVDD vs VDD
Opto Driver Short-Circuit Current
vs VDD
VDD (V)
5
–20
–10
0
810
14
1698 G17
–30
–40
–50
67
9
11
12
13
TA = 25°C
VOPTODRV = 1.233V
VDD (V)
5
12
16
20
13
1698 G18
8
4
10
14
18
6
2
0
7
6
9
8
11
12
10
14
TA = 25°C
fSYNC = 100kHz
CFG = CCG = 4700pF
CFG = CCG = 3300pF
CFG = CCG = 2200pF
CFG = CCG = 1000pF
DRIVER LOAD (pF)
0
4000
8000
10000
90
80
70
60
50
40
30
20
10
0
1698 G25
2000
6000
VDD = 8V
TA = 25°C
CG, FG tPHL
tf
tr
CG, FG tPLH
TEMPERATURE (
°C)
–50 –25
0
25
50
75
100 125 150
90
80
70
60
50
40
30
20
10
0
1698 G26
VDD = 8V
CCG = CFG = 1000pF
fSYNC = 100kHz
CG, FG tPLH
CG, FG tPHL
fSYNC (kHz)
50
150
250 300
500
1698 G27
100
200
350 400 450
30
25
20
15
10
5
0
2.2
2.0
1.8
1.6
1.4
1.2
1.0
VDD = 8V
TA = 25°C
tDISS × fSYNC
tDISS
Driver Rise, Fall and Propagation
Delay vs Driver Load
SYNC Input to Driver Output Delay
vs Temperature
Driver Disable Time-Out vs SYNC
Frequency



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