Data Sheet

©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2741A, FOD2741B, FOD2741C Rev. 1.0.1 8
FOD2741A, FOD2741B, FOD2741C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 10 – Reference Voltage vs. Ambient Temperature
V
REF
– REFERENCE VOLTAGE (V)
I
LED
= 10mA
T
A
– AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
T
A
– AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
I
REF
– REFERENCE CURRENT (µA)
Fig. 11 – Reference Current vs Ambient Temperature
2.490
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
2.508
2.510
1.05
1.10
1.15
1.20
1.25
1.30
I
LED
= 10mA
R1 = 10kΩ
T
A
= 25°C
V
COMP
= V
FB
Fig. 9a – LED Current vs. Cathode Voltage
I
LED –
SUPPLY CURRENT (mA)
I
LED –
SUPPLY CURRENT (mA)
-15
-10
-5
0
5
10
15
-1 0 1 2
V
COMP
– CATHODE VOLTAGE (V)
3
Fig. 9b – LED Current vs. Cathode Voltage
-1.0
-0.5
0.0
0.5
1.0
–1 0 1 2
V
COMP
– CATHODE VOLTAGE (V)
3
T
A
= 25°C
V
COMP
= V
FB
T
A
– AMBIENT TEMPERATURE (°C)
-40 -20 0 20 40 60 80 100
I
OFF
– OFF–STATE CURRENT (nA)
1
10
100
Fig. 12 – Off–State Current vs. Ambient Temperature
V
CC
= 37V
V
F
– FORWARD VOLTAGE (V)
I
F
– FORWARD CURRENT (mA)
5
0.9 1.0 1.1 1.2
70°C
25°C
0°C
1.3 1.4
10
15
20
Fig. 13 – Forward Current vs. Forward Voltage