Datasheet

©2004 Fairchild Semiconductor Corporation www.fairchildsemi.com
FOD2743A, FOD2743B, FOD2743C Rev. 1.0.1 8
FOD2743A, FOD2743B, FOD2743C — Optically Isolated Error Amplifier
Typical Performance Curves
Fig. 10 – Reference Voltage Variation vs. Ambient Temperature
∆V
REF
– REFERENCE VOLTAGE VARIATION (%)
T
A
= 25°C
V
COMP
= V
FB
T
A
– AMBIENT TEMPERATURE (°C)
T
A
– AMBIENT TEMPERATURE (°C)
Fig. 9a – LED Current vs. Cathode Voltage
I
LED –
SUPPLY CURRENT (mA)
I
LED –
SUPPLY CURRENT (mA)
I
REF –
REFERENCE CURRENT (µA)
-15
-10
-5
0
5
10
15
-1 0 1 2
V
COMP
– CATHODE VOLTAGE (V)
3
Fig. 9b – LED Current vs. Cathode Voltage
Fig. 11 – Reference Current vs Ambient Temperature
-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
-40 -20 0 20 40 60 80 100
-40 -20 0 20 40 60 80 100
1.0
1.5
2.0
2.5
3.0
3.5
4.0
I
LED
= 1mA, 10mA
R1 = 10kΩ
-1.0
-0.8
-0.6
-0.4
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
I
LED
= 1mA, 10mA
Normalized to T
A
= 25°C