TL431, A, B Series, NCV431A
∆
Vref , REFERENCE INPUT VOLTAGE (mV)
I
K
= 10 mA
T
A
= 25°C
−8.0
Ioff , OFF−STATE CATHODE CURRENT (nA)
0
1.0 k
100
10
1.0
0.1
0.01
−55
V
KA
= 36 V
V
ref
= 0 V
I
off
−16
Input
R1
I
K
V
ref
V
KA
Input
V
KA
−24
R2
−32
0
10
20
30
40
−25
0
25
50
75
100
125
V
KA
, CATHODE VOLTAGE (V)
T
A
, AMBIENT TEMPERATURE (5C)
Figure 8. Change in Reference Input
Voltage versus Cathode Voltage
Figure 9. Off−State Cathode Current
versus Ambient Temperature
100
|ZKA|, DYNAMIC IMPEDANCE (
Ω
)
I
K
−
+
Output
|ZKA|, DYNAMIC IMPEDANCE (
Ω
)
1.0 k
50
10
T
A
= 25°C
D
I
K
= 1.0 mA to 100 mA
0.320
0.300
0.280
0.260
0.240
0.220
0.200
−55
−25
0
25
50
75
100
125
V
KA
= V
ref
D
I
K
= 1.0 mA to 100 mA
f
≤
1.0 kHz
Output
1.0 k
I
K
50
−
+
GND
GND
1.0
0.1
1.0 k
10 k
100 k
f, FREQUENCY (MHz)
1.0 M
10 M
T
A
, AMBIENT TEMPERATURE (°C)
Figure 10. Dynamic Impedance
versus Frequency
Figure 11. Dynamic Impedance
versus Ambient Temperature
A VOL, OPEN LOOP VOLTAGE GAIN (dB)
60
50
40
30
20
10
0
−10
1.0 k
10 k
100 k
f, FREQUENCY (MHz)
1.0 M
10 M
I
K
= 10 mA
T
A
= 25°C
NOISE VOLTAGE (nV/
√
Hz)
9.0
mF
15 k
8.25 k
GND
I
K
230
Output
80
60
40
Input
20
V
KA
= V
ref
I
K
= 10 mA
T
A
= 25°C
Output
I
K
0
10
100
1.0 k
f, FREQUENCY (Hz)
10 k
100 k
Figure 12. Open−Loop Voltage Gain
versus Frequency
Figure 13. Spectral Noise Density
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