2002 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.6
Features
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance 0.20 Typical
Sink Current Capability of 1.0 to 100mA
Equivalent Full-Range Temperature Coefficient of
50ppm/
C Typical
Temperature Compensated for Operation Over Full Rated
Operating Temperature Range
Low Output Noise Voltage
Fast Turn-on Response
Description
The KA431/KA431A/KA431L are three-terminal adjustable
regulator series with a guaranteed thermal stability over
applicable temperature ranges. The output voltage may be
set to any value between VREF (approximately 2.5 volts)
and 36 volts with two external resistors These devices have a
typical dynamic output impedance of 0.2W Active output
circuitry provides a very sharp turn on characteristic,
making these devices excellent replacement for zener diodes
in many applications.
TO-92
8-DIP
8-SOP
1. Ref 2. Anode 3. Cathode
1
1
1
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
Internal Block Diagram
2.5 Vref
CATHODE
ANODE
REFERENCE
ANODE(A)
REFERENCE (R)
CATHODE (K)
KA431/KA431A/KA431L
Programmable Shunt Regulator
KA431/KA431A/KA431L
2
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Recommended Operating Conditions
Parameter
Symbol
Value
Unit
Cathode Voltage
V
KA
37
V
Cathode Current Range (Continuous)
I
KA
-100 ~ +150
mA
Reference Input Current Range
I
REF
0.05 ~ +10
mA
Power Dissipation
D, Z Suffix Package
DIP Package
P
D
770
1000
mW
mW
Junction Temperature
T
J
150
C
Operating Temperature Range
T
OPR
-25 ~ +85
C
Storage Temperature Range
T
STG
-65 ~ +150
C
Parameter
Symbol
Min.
Typ.
Max.
Unit
Cathode Voltage
V
KA
V
REF
-
36
V
Cathode Current
I
KA
1.0
-
100
mA
KA431/KA431A/KA431L
3
Electrical Characteristics
(T
A
= +25
C, unless otherwise specified)
T
MIN
= -25
C, T
MAX
= +85
C
Parameter
Symbol
Conditions
KA431
KA431A
KA431L
Unit
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
Reference Input
Voltage
V
REF
V
KA
=V
REF
,
I
KA
=10mA
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508
V
Deviation of
Reference
Input Voltage
Over-
Temperature
VREF/
T
VKA=VREF,
IKA=10mA
TMIN
TA
TMAX
-
4.5
17
-
4.5
17
-
4.5
17
mV
Ratio of Change
in Reference
Input Voltage
VREF/
VKA
IKA
=10mA
VKA=10
V-VREF
-
-1.0
- 2.7
-
-1.0
- 2.7
-
-1.0
-2.7
mV/V
to the Change in
Cathode
Voltage
VKA=36
V-10V
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
Reference Input
Current
IREF
IKA=10mA,
R1=10k
,R2=
-
1.5
4
-
1.5
4
-
1.5
4
A
Deviation of
Reference
Input Current
Over Full
Temperature
Range
IREF/
T
IKA=10mA,
R1=10k
,R2=
TA =Full Range
-
0.4
1.2
-
0.4
1.2
-
0.4
1.2
A
Minimum
Cathode Cur-
rent for
Regulation
IKA(MIN)
VKA=VREF
-
0.45
1.0
-
0.45
1.0
-
0.45
1.0
mA
Off - Stage
Cathode
Current
IKA(OFF)
VKA=36V,
VREF=0
-
0.05
1.0
-
0.05
1.0
-
0.05
1.0
A
Dynamic
Impedance
ZKA
VKA=VREF,
IKA=1 to 100mA
f
1.0kHz
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
KA431/KA431A/KA431L
4
Test Circuits
Figure 1. Test Circuit for V
KA
=V
REF
Figure 2. Test Circuit for V
KA
V
REF
Figure 3. Test Circuit for l
KA(OFF)
KA431/KA431A/KA431L
5
Typical Performance Characteristics
Figure 4. Cathode Current vs. Cathode Voltage
Figure 5. Cathode Current vs. Cathode Voltage
Figure 6. Change In Reference Input Voltage vs.
Cathode Voltage
Figure7. Dynamic Impedance Frequency
Figure 8. Small Signal Voltage Amplification vs. Frequency
Figure 9. Pulse Response
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