9/6/02
Page 7 of 14
© 2002 Fairchild Semiconductor Corporation
OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2711
TYPICAL PERFORMANCE CURVES
V
COMP
- CATHODE VOLTAGE (V)
-1 0 1 2
Fig. 9b LED Current vs Cathode Voltage
I
LED
- SUPPLY CURRENT (mA)
-150
-100
-50
0
50
100
150
TA = 25°C
V
COMP
= V
FB
Fig. 10 Reference Voltage vs Ambient Temperature
T
A
- AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
V
REF
- REFERENCE VOLTAGE (V)
1.230
1.232
1.234
1.236
1.238
1.240
1.242
1.244
I
LED
=
Fig. 11 Reference Current vs Ambient Temperature
T
A
- AMBIENT TEMPERATURE (°C)
I
REF
- REFERENCE CURRENT (nA)
120
-40 -20 0 20 40 60 80 100
140
160
180
200
220
240
260
280
Fig. 12 Off-State Current vs Ambient Temperature
T
A
- AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
I
OFF
- OFF-STATE CURRENT (NA)
0.1
1
10
100
1000
V
C
C
= 13.2V
I
LED
= 10mA
R
1
= 10 kΩ
10mA
Fig. 9a LED Current vs Cathode Voltage
V
COMP
- CATHODE VOLTAGE (V)
-1.0 -0.5 0.0 0.5 1.0 1.5
I
LED
- SUPPLY CURRENT (mA)
-15
-10
-5
0
5
10
15
T
A
= 25°C
V
COMP
= V
FB