LTC1698_15 Datasheet, PDF (5/24 Pages) Linear Technology – Isolated Secondary Synchronous Rectifier Controller

TYPICAL PERFOR A CE CHARACTERISTICS
LTC1698
V_AUX vs Temperature
3.465
V_DD = 8V
3.424 ^{ILOAD = 0mA}
3.383
3.341
3.300
3.259
3.218
3.176
3.135
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1698 G10
V_AUX vs Line Voltage
3.465
V_DD = 8V
3.424 ^{ILOAD = 0mA}
3.383
3.341
3.300
3.259
3.218
3.176
3.135
5 6 7 8 9 10 11 12 13 14
V_DD (V)
1698 G11
V_AUX vs Load Current
3.465
V_DD = 8V
3.424 ^{TA = 25°C}
3.383
3.341
3.300
3.259
3.218
3.176
3.135
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (mA)
1698 G12
V_AUX Short-Circuit Current
vs Temperature
0
V_DD = 8V
–10
–20
–30
–40
–50
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1698 G13
Maximum OPTO Driver Output
Voltage vs Load Current
8
V_DD = 10V
6
V_DD = 8V
V_DD = 7V
4
V_DD = 6V
V_DD = 5V
2
T_A = 25°C
V_COMP = 0V
0
0 12345678
LOAD CURRENT (mA)
9 10
1698 G22
V_AUX Short-Circuit Current
vs V_DD
0
T_A = 25°C
–10
–20
–30
–40
–50
5 6 7 8 9 10 11 12 13 14
V_DD (V)
1698 G14
Opto Driver Load Regulation
3.030
1.0
V_DD = 8V
3.024 T_A = 25°C
0.8
3.018
0.6
3.012
0.4
3.006
0.2
3.000
0
2.994
–0.2
2.988
–0.4
2.982
–0.6
2.976
–0.8
2.970
–1.0
0 1 2 3 4 5 6 7 8 9 10
LOAD CURRENT (mA)
1698 G15
Maximum OPTO Driver Output
Voltage vs Temperature
8
V_DD = 10V
6
V_DD = 8V
V_DD = 7V
4
V_DD = 6V
V_DD = 5V
2
Opto Driver Short-Circuit Current
vs Temperature
–10
V_DD = 8V
–15 ^{VOPTODRV = 1.233V}
–20
–25
–30
–35
–40
V_COMP = 0V
I_OPTODRV = –10mA
0
–50 –25 0 25 50
75 100 125 150
TEMPERATURE (°C)
1698 G23
–45
–50
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1698 G16
1698f
5