Philips Semiconductors
Product specification
Adjustable precision shunt regulators
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
4
3
Vn – INPUT NOISE VOLTAGE –
µ
V
2
1
0
–1
–2
–3
–4
0
1
2
3
4
5
6
t – TIME – (SECONDS)
7
8
9
10
Equivalent Input Noise Voltage Over a 10-Second Period
19.1V
1kΩ
500µF
910Ω
2000µF
V
CC
1µF
820Ω
TLE2027
A
V
= 10V/mV
16kΩ
16Ω
160kΩ
1µF
0.1µF
33kΩ
33kΩ
1MΩ
CRO
16kΩ
TLE2027
A
V
= 2V/V
V
CC
TL431
(DUT)
22µF
V
EE
V
EE
Test Circuit
Figure 12.
SL01174
400
I
K
= 10mA
T
amb
= 25°C
350
Vn – NOISE VOLTAGE – nV/
√
Hz
300
250
200
150
100
10
100
1K
f–FREQUENCY–Hz
10K
100K
SL01180
Figure 13. Equivalent Input Noise Voltage vs. Frequency
1997 Feb 25
7