FAIRCHILD KA431SMF

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KA431S/KA431SA/KA431SL
Programmable Shunt Regulator
Features
Description
•
•
•
•
The KA431S/KA431SA/KA431SL 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.
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
SOT-23F
3
1
2
MF- 1.Cathode 2. Ref 3. Anode
MF2- 1. Ref 2. Cathode 3. Anode
Internal Block Diagram
CATHODE
+
REFERENCE
2.5 Vref
ANODE
CATHODE (K)
REFERENCE (R)
ANODE(A)
Rev. 1.0.6
©2005 Fairchild Semiconductor Corporation
KA431S/KA431SA/KA431SL
Absolute Maximum Ratings
(Operating temperature range applies unless otherwise specified.)
Parameter
Symbol
Value
Unit
Cathode Voltage
VKA
37
V
Cathode Current Range (Continuous)
IKA
-100 ~ +150
mA
Reference Input Current Range
IREF
-0.05 ~ +10
mA
Thermal Resistance Junction-Air (Note1,2)
MF Suffix Package
RθJA
350
°C/W
PD
350
mW
Power Dissipation (Note3,4)
MF Suffix Package
TJ
150
°C
Operating Temperature Range
TOPR
-25 ~ +85
°C
Storage Temperature Range
TSTG
-65 ~ +150
°C
Junction Temperature
Note :
1. Thermal resistance test board
Size: 76.2mm * 114.3mm * 1.6mm (1S0P)
JEDEC Standard: JESD51-3, JESD51-7
2. Assume no ambient airflow.
3. TJMAX = 150°C, Ratings apply to ambient temperature at 25°C
4. Power dissipation calculation: PD = (TJ - TA)/RθJA
Recommended Operating Conditions
Parameter
2
Symbol
Min.
Typ.
Max.
Unit
Cathode Voltage
VKA
VREF
-
36
V
Cathode Current
IKA
1.0
-
100
mA
KA431S/KA431SA/KA431SL
Electrical Characteristics
(TA = +25°C, unless otherwise specified)
Parameter
Symbol
Reference Input
Voltage
VREF
Deviation of
Reference
Input Voltage
OverTemperature
Ratio of Change
in Reference
Input Voltage
∆VREF/
∆T
∆VREF/
∆VKA
to the Change in
Cathode
Voltage
Conditions
VKA=VREF,
IKA=10mA
VKA=VREF,
IKA=10mA
TMIN≤TA≤TMAX
IKA
=10mA
∆VKA=10
V-VREF
Min.
KA431S
KA431SA
Typ.
Max. Min. Typ. Max. Min.
2.450 2.500
-
-
KA431SL
Typ.
Max.
2.550 2.470 2.495 2.520 2.482 2.495 2.508
4.5
17
-1.0
-2.7
-
-
4.5
17
-1.0
-2.7
-
-
4.5
17
-1.0
-2.7
Unit
V
mV
mV/V
∆VKA=36
V-10V
-
-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
Deviation of
Reference
Input Current
Over Full
Temperature
Range
IKA=10mA,
R1=10kΩ,R2=∞
∆IREF/∆T
TA =Full Range
-
0.4
1.2
0.4
1.2
0.4
1.2
µA
Minimum
Cathode Current 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
µA
VKA=VREF,
IKA=1 to 100mA
f ≥1.0kHz
-
0.15
0.5
-
0.15
0.5
-
0.15
0.5
Ω
Reference Input
Current
Dynamic
Impedance
IREF
ZKA
-
-
• TMIN = -25°C, TMAX = +85°C
3
KA431S/KA431SA/KA431SL
Test Circuits
KA431S
KA431S
Figure 1. Test Circuit for VKA=VREF
KA431S
Figure 3. Test Circuit for lKA(OFF)
4
Figure 2. Test Circuit for VKA≥VREF
KA431S/KA431SA/KA431SL
Typical Performance Characteristics
800
150
VKA = VREF
o
VKA = VREF
TA = 25 C
o
TA = 25 C
600
IKA, CATHODE CURRENT (uA)
IK, Cathode Current (mA)
100
50
0
IKA(MIN)
400
200
0
-50
-200
-100
-2
-1
0
1
2
-1
3
0
1
2
3
VKA, CATHODE VOLTAGE (V)
VKA, Cathode Voltage (V)
Figure 4. Cathode Current vs. Cathode Voltage
Figure 5. Cathode Current vs. Cathode Voltage
3.5
0.100
Iref, Reference Input Current (uA)
Ioff, Off-State Cathode Current (uA)
3.0
0.075
0.050
0.025
0.000
-50
-25
0
25
50
75
100
2.5
2.0
1.5
1.0
0.5
0.0
-50
125
-25
0
o
25
50
75
100
125
o
TA, Ambient Temperature ( C)
TA, Ambient Temperature ( C)
Figure 6. OFF-State Cathode Current vs.
Ambient Temperature
Figure7. Reference Input Current vs.
Ambient Temperature
6
60
o
TA = 25 C
IKA = 10mA
50
o
TA=25 C
5
INPUT
4
Voltage Swing (V)
Open Loop Voltage Gain (dB)
40
30
20
3
OUTPUT
2
10
1
0
0
-10
1k
10k
100k
1M
10M
Frequency (Hz)
Figure 8. Small Signal Voltage Amplification vs. Frequency
0
4
8
12
16
20
Time (us)
Figure 9. Pulse Response
5
KA431S/KA431SA/KA431SL
Typical Performance Characteristics (Continued)
5
140
A VKA = Vref
B VKA = 5.0 V @ IK = 10mA
120
4
o
A
100
Current(mA)
IK, CATHODE CURRENT(mA)
TA = 25 C
80
stable
stable
60
3
2
40
1
20
B
0
100p
1n
10n
1!
100n
10!
CL, LOAD CAPACITANCE
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Anode-Ref. Voltage(V)
Figure 10. Stability Boundary Conditions
5
Current(mA)
4
3
2
1
0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
Ref.-Cathode Voltage(V)
Figure 12. Reference-Cathode Diode Curve
6
Figure 11. Anode-Reference Diode Curve
KA431S/KA431SA/KA431SL
Typical Application
R1
V O = V ref  1 + -------
R2
R1
V O =  1 + ------- V ref

R 2
KA431S
R1
V O =  1 + ------- V ref

R 2
KA431S
KA431S
Figure 13. Shunt Regulator
-
Figure 14. Output Control for
Figure 15. High Current Shunt Regulator
Three-Termianl Fixed Regulator
KA431S
Figure 16. Current Limit or Current Source
KA431S
Figure 17. Constant-Current Sink
7
KA431S/KA431SA/KA431SL
Mechanical Dimensions
Package
Dimensions in millimeters
SOT-23F
8
KA431S/KA431SA/KA431SL
Marking
43A
43B
2% tolerance
1% tolerance
43C
MF-
43D
43E
43F
43A
43B
2% tolerance
1% tolerance
MF2-
0.5% tolerance
43C
0.5% tolerance
9
KA431S/KA431SA/KA431SL
Ordering Information
Product Number
Output Voltage Tolerance
Package
KA431SLMF
0.5%
SOT-23F
KA431SAMF
1%
SOT-23F
KA431SMF
2%
SOT-23F
KA431SLMF2
0.5%
SOT-23F
KA431SAMF2
1%
SOT-23F
KA431SMF2
2%
SOT-23F
Operating Temperature
-25 ~ +85°C
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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 2005 Fairchild Semiconductor Corporation