Fairchild Semiconductor KA431Z, KA431LZ, KA431LD, KA431D, KA431AZ Datasheet
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KA431/KA431A/KA431L
Programmable Shunt Regulator
www.fairchildsemi.com
Features
• Programmable Output Voltage to 36 Volts
• Low Dynamic Output Impedance 0.20 Typical
• Sink Curren t 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
1
1. Ref 2. Anode 3. Cathode
8-DIP 8-SOP
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
1
Internal Block Diagram
REFERENCE
REFERENCE (R)
©2002 Fairchild Semiconductor Corporation
CATHODE
2.5 Vref
ANODE
CATHODE (K)
ANODE(A)
Rev. 1.0.6
KA431/KA431A/KA431L
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter Symbol Value Unit
Cathode Voltage V
Cathode Current Range (Continuous) I
Reference Input Current Range I
KA
KA
REF
37 V
-100 ~ +150 mA
0.05 ~ +10 mA
Power Dissipation
D, Z Suffix Package
DIP Package
Junction Temperature T
Operating Temperature Range T
Storage Temperature Range T
P
D
J
OPR
STG
770
1000
mW
mW
150 °C
-25 ~ +85 °C
-65 ~ +150 °C
Recommended Operating Conditions
Parameter Symbol Min. Typ. Max. Unit
Cathode Voltage V
Cathode Current I
KA
KA
V
REF
1.0 - 100 mA
-36V
2
Electrical Characteristics
(TA = +25°C, unless otherwise specified)
KA431/KA431A/KA431L
Parameter Symbol Conditions
Reference Input
Voltage
Deviation of
Reference
Input Voltage
OverTemperature
Ratio of Change
in Reference
Input Voltage
to the Change i n
Cathode
Voltage
Reference Input
Current
Deviation of
Reference
Input Current
Over Full
Temperature
Range
Minimum
Cathode Current for
Regulation
Off - Stage
Cathode
Current
Dynamic
Impedance ZKA
V
REF
∆VREF/∆TVKA=VREF,
∆VREF/
∆VKA
IREF
∆IREF/∆T
IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 - 0.45 1.0 mA
IKA(OFF)
VKA=V
REF
I
=10mA
KA
IKA=10mA
TMIN≤TA≤TMAX
∆VKA=10
IKA
=10mA
IKA=10mA,
R1=10kΩ,R2=∞
IKA=10mA,
R1=10kΩ,R2=∞
TA =Full Range
VKA=36V,
VREF=0
VKA=VREF,
IKA=1 to 100mA
f ≥1.0kHz
V-VREF
∆VKA=36
V-10V
KA431 KA431A KA431L
Min. Typ. Max. Min. Typ. Max. Min. Typ. Max.
,
2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 V
-
4.5 17
- -1.0 - 2.7 - -1.0 - 2.7 - -1.0 -2.7
- -0.5 -2.0 - -0.5 -2.0 - -0.5 -2.0
-1.54 -1.54 -1.54
-
0.4 1.2
- 0.05 1.0 - 0.05 1.0 - 0.05 1.0
- 0.15 0.5 - 0.15 0.5 - 0.15 0.5 Ω
-
-
4.5 17
0.4 1.2
-
4.5 17 mV
-
0.4 1.2
Unit
mV/V
A
µ
A
µ
A
µ
•T
MIN
= -25°C, T
MAX
= +85°C
3
KA431/KA431A/KA431L
Test Circuits
Figure 1. Test Circuit for VKA=V
Figure 3. Test Circuit for l
KA(OFF)
REF
Figure 2. Test Circuit for V
KA
≥≥≥≥V
REF
4
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