FOD2712 Datasheet, PDF (7/13 Pages) Fairchild Semiconductor – OPTICALLY ISOLATED ERROR AMPLIFIER

OPTICALLY ISOLATED
ERROR AMPLIFIER
FOD2712
TYPICAL PERFORMANCE CURVES
Fig. 9a LED Current vs Cathode Voltage
15
T_A = 25°C
10 ^{VCOMP = VFB}
5
0
-5
-10
-15
-1.0
-0.5
0.0
0.5
1.0
1.5
V_COMP - CATHODE VOLTAGE (V)
Fig. 9b LED Current vs Cathode Voltage
150
120
T_A = 25°C
V_COMP = V_FB
90
60
30
0
-30
-60
-90
-120
-150
-1.0
-0.5
0.0
0.5
1.0
1.5
V_COMP - CATHODE VOLTAGE (V)
Fig. 10 Reference Voltage vs Ambient Temperature
Fig. 11 Reference Current vs Ambient Temperature
1.254
I_LED = 10 mA
1.248
350
I_LED = 10 mA
R₁ = 10 kΩ
300
250
1.242
200
150
1.236
100
1.230
-40
-20
0
20
40
60
80
T_A - AMBIENT TEMPERATURE (°C)
50
-40 -20
0
20
40
60
80
100
T_A - AMBIENT TEMPERATURE (°C)
Fig. 12 Off Current vs Ambient Temperature
100 _{VLED = 13.2 V}
V_FB = 0
10
1
0.1
-40 -20
0
20
40
60
80
100
T_A - AMBIENT TEMPERATURE (°C)
© 2003 Fairchild Semiconductor Corporation
Page 7 of 13
4/10/03