Philips Semiconductors
Product specification
Adjustable precision shunt regulators
TL431C, TL431AC, TL431I,
TL431AI, LM431AC
αV
REF
can be positive or negative depending on whether minimum V
REF
of maximum V
REF
, respectively, occurs at the lower temperature.
Example: Max V
REF
= 2496mV at 30°C, Min V
REF
= 2492mV at 0°C, V
REF
= 2495mV at 25°C, DTA = 70°C for TL431C.
|
aV
REF
|
+
4mV
@
2495mV
70
o
C
10
6
+
23ppm
o
C
Because minimum V
REF
occurs at the lower temperature, the coefficient is positive.
4. The dynamic impedance is defined as: | Z |
+
DV
KA
KA
DI
K
When the device is operating with two external resistors, (see Figure xx), the total dynamic impedance of the circuit is given by:
| Z |
+
DV
[
| Z
KA
| 1
)
R1
R2
DI
PARAMETER MEASUREMENT INFORMATION
INPUT
I
K
V
KA
INPUT
I
off
V
KA
V
ref
SL01177
SL01179
Figure 3. Test Circuit for V
KA
= V
ref
Figure 5. Test Circuit for I
OFF
INPUT
I
K
I
ref
V
KA
R1
R2
V
ref
V
KA
+
V
ref
1
)
R1
)
I
ref
R2
R1
SL01178
Figure 4. Test Circuit for V
KA
> V
ref
1997 Feb 25
5
PHILIPS [ NXP SEMICONDUCTORS ]
