TLV431A, TLV431B
350
Input
Input
I
ref
V
KA
= V
ref
I
K
= 10 mA
T
A
= 25°C
Pulse
Generator
f = 100 kHz
I
K
Output
1.8 k
W
Output
NOISE VOLTAGE (nV/
√
Hz)
325
1.5
(VOLTS)
1.0
0.5
0
2.0
0
50
Output
T
A
= 25°C
300
Input
275
250
10
100
1.0 k
10 k
f, FREQUENCY (Hz)
100 k
0
1.0
2.0
3.0
4.0 5.0 6.0
t, TIME (ms)
7.0
8.0
9.0
10.0
Figure 16. Spectral Noise Density
Figure 17. Pulse Response
25
20
15
B
10
5.0
0
10
pF
A
1.0 k
T
A
= 25°C
Stable
V+
C
Stable
R2
R1
I
K
C
L
I K, CATHODE CURRENT (mA)
Stable
D
100
pF
1.0
nF
0.01
mF
0.1
mF
1.0
mF
10
mF
100
mF
Unstable
Regions
A, C
B, D
V
KA
(V)
V
ref
5.0
R1
(kW)
0
30.4
R2
(kW)
∞
10
C
L
, LOAD CAPACITANCE
Figure 18. Stability Boundary Conditions
Figure 19. Test Circuit for Figure 18
Stability
Figures 18 and 19 show the stability boundaries and
circuit configurations for the worst case conditions with the
load capacitance mounted as close as possible to the device.
The required load capacitance for stable operation can vary
depending on the operating temperature and capacitor
equivalent series resistance (ESR). Ceramic or tantalum
surface mount capacitors are recommended for both
temperature and ESR. The application circuit stability
should be verified over the anticipated operating current and
temperature ranges.
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