www.fairchildsemi.com
KA431/KA431A/KA431L
Programmable Shunt Regulator
Features
•
•
•
•
Programmable Output Voltage to 36 Volts
Low Dynamic Output Impedance 0.2
Ω
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 0.2
Ω
. Active output
circuitry provides a very sharp turn on characteristic, making
these devices excellent replacement for zener diodes in many
applications.
TO-92
1
1. Ref 2. Anode 3. Cathode
8-DIP
8-SOP
1
1
1.Cathode 2.3.4.5.7.NC
6.Anode 8.Ref
1.Cathode 2.3.6.7.Anode
4.5.NC 8.Ref
Internal Block Diagram
REFERENCE
+
-
2.5 Vref
CATHODE
ANODE
CATHODE (K)
REFERENCE (R)
ANODE(A)
Rev. 1.0.9
©2011 Fairchild Semiconductor Corporation
KA431/KA431A/KA431L
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter
Cathode Voltage
Cathode Current Range (Continuous)
Reference Input Current Range
Power Dissipation
D, Z Suffix Package
DIP Package
Operating Temperature Range
Junction Temperature
Storage Temperature Range
Symbol
V
KA
I
KA
I
REF
P
D
T
OPR
T
J
T
STG
Value
37
-100 ~ +150
-0.05 ~ +10
770
1000
-25 ~ +85
150
-65 ~ +150
Unit
V
mA
mA
mW
mW
°C
°C
°C
Recommended Operating Conditions
Parameter
Cathode Voltage
Cathode Current
Symbol
V
KA
I
KA
Min.
V
REF
1.0
Typ.
-
-
Max.
36
100
Unit
V
mA
2
KA431/KA431A/KA431L
Electrical Characteristics
(T
A
= +25°C, unless otherwise specified)
Parameter
Reference Input
Voltage
Deviation of
Reference
Input Voltage
Over-
Temperature
Symbol
V
REF
ΔVREF/
ΔT
Conditions
V
KA
=V
REF
,
I
KA
=10mA
VKA=VREF,
IKA=10mA
TMIN≤TA≤TMAX
ΔVKA=10
V-VREF
IKA
=10mA
ΔVKA=36
V-10V
KA431
Min.
Typ.
KA431A
Max. Min. Typ. Max. Min.
KA431L
Typ.
Max.
Unit
V
2.450 2.500
2.550 2.470 2.495 2.520 2.482 2.495 2.508
-
4.5
17
-
4.5
17
-
4.5
17
mV
Ratio of Change
in Reference
ΔVREF/
Input Voltage
to the Change in
ΔVKA
Cathode
Voltage
Reference Input
Current
Deviation of
Reference
Input Current
Over Full
Temperature
Range
Minimum
Cathode Cur-
rent for
Regulation
Off - Stage
Cathode
Current
Dynamic
Impedance
IREF
-
-1.0
- 2.7
-
-1.0
- 2.7
-
-1.0
-2.7
mV/V
-
-0.5
-2.0
-
-0.5
-2.0
-
-0.5
-2.0
IKA=10mA,
R1=10kΩ,R2=∞
-
1.5
4
-
1.5
4
-
1.5
4
μA
IKA=10mA,
R1=10kΩ,R2=∞
ΔIREF/ΔT
TA =Full Range
-
0.4
1.2
-
0.4
1.2
-
0.4
1.2
μA
IKA(MIN)
VKA=VREF
-
0.45
1.0
-
0.45
1.0
-
0.45
1.0
mA
IKA(OFF)
VKA=36V,
VREF=0
VKA=VREF,
IKA=1 to 100mA
f
≥1.0kHz
-
0.05
1.0
-
0.05
1.0
-
0.05
1.0
μA
ZKA
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
Ω
• T
MIN
= -25°C, T
MAX
= +85°C
3
KA431/KA431A/KA431L
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)
4
KA431/KA431A/KA431L
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
5
PCB Design
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