Philips Semiconductors
Product specification
Adjustable precision shunt regulators
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
TYPICAL CHARACTERISTICS
7
INPUT AND OUTPUT VOLTAGE – V
6
5
4
3
2
1
0
0
1
2
3
t – TIME –
µs
4
5
6
7
GND
PULSE
GENERATOR
f = 100kHz
220Ω
OUTPUT
50Ω
Test Circuit
Pulse Response
Figure 14. Pulse Response
SL01182
100
90
80
IK – CATHODE CURRENT – (mA)
70
STABLE
60
A
50
A
40
30
20
10
0
0.001
D
0.01
C
UNSTABLE V
KA
< 15V
UNSTABLE V
KA
0.1
C
L
– LOAD CAPACITANCE – (µF)
1
10
C
L
R2
R1 = 10kΩ
UNSTABLE
V
KA
< 10
STABLE
T
amb
= 25°C
A V
KA
= V
ref
B V
KA
= 5V
C V
KA
= 10V
D V
KA
= 15V
UNSTABLE
V
KA
< 5
B
I
K
C
L
150Ω
V
BATT
Test Circuit for Curve A
I
K
150Ω
V
BATT
Test Circuit for Curves B, C, and D
SL01176
Figure 15. Stability Boundary Conditions
1997 Feb 25
8
PHILIPS [ NXP SEMICONDUCTORS ]
