www.fairchildsemi.com
KA431S/KA431SA/KA431SL
Programmable Shunt Regulator
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 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.
SOT-23F
3
1 2
MF- 1.Cathode 2. Ref 3. Anode
MF2- 1. Ref 2. Cathode 3. Anode
Internal Block Diagram
REFERENCE |
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CATHODE |
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2.5 Vref |
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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 |
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Cathode Voltage |
VKA |
37 |
V |
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Cathode Current Range (Continuous) |
IKA |
-100 ~ +150 |
mA |
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Reference Input Current Range |
IREF |
-0.05 ~ +10 |
mA |
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Thermal Resistance Junction-Air (Note1,2) |
Rθ JA |
350 |
° C/W |
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MF Suffix Package |
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Power Dissipation (Note3,4) |
PD |
350 |
mW |
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MF Suffix Package |
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Junction Temperature |
TJ |
150 |
° C |
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Operating Temperature Range |
TOPR |
-25 ~ +85 |
° C |
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Storage Temperature Range |
TSTG |
-65 ~ +150 |
° C |
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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)/Rθ JA
Recommended Operating Conditions
Parameter |
Symbol |
Min. |
Typ. |
Max. |
Unit |
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Cathode Voltage |
VKA |
VREF |
- |
36 |
V |
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Cathode Current |
IKA |
1.0 |
- |
100 |
mA |
2
KA431S/KA431SA/KA431SL
Electrical Characteristics
(TA = +25° C, unless otherwise specified)
Parameter |
Symbol |
Conditions |
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KA431S |
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KA431SA |
KA431SL |
Unit |
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Min. |
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Typ. |
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Max. |
Min. |
Typ. |
Max. |
Min. |
Typ. |
Max. |
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Reference Input |
VREF |
VKA=VREF, |
2.450 |
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2.500 |
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2.550 |
2.470 |
2.495 |
2.520 |
2.482 |
2.495 |
2.508 |
V |
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Voltage |
IKA=10mA |
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Deviation of |
∆ VREF/ |
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Reference |
VKA=VREF, |
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Input Voltage |
∆ T |
IKA=10mA |
- |
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4.5 |
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17 |
- |
4.5 |
17 |
- |
4.5 |
17 |
mV |
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Over- |
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TMIN≤ TA≤ TMAX |
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Temperature |
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Ratio of Change |
∆ VREF/ |
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∆ VKA=10 |
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in Reference |
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-1.0 |
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-2.7 |
- |
-1.0 |
-2.7 |
- |
-1.0 |
-2.7 |
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∆ VKA |
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V-VREF |
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Input Voltage |
IKA |
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mV/V |
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to the Change in |
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=10mA |
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∆ VKA=36 |
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Cathode |
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-0.5 |
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-2.0 |
- |
-0.5 |
-2.0 |
- |
-0.5 |
-2.0 |
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V-10V |
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Voltage |
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Reference Input |
IREF |
IKA=10mA, |
- |
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1.5 |
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4 |
- |
1.5 |
4 |
- |
1.5 |
4 |
A |
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Current |
R1=10kΩ |
,R2=∞ |
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Deviation of |
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Reference |
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IKA=10mA, |
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Input Current |
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∆ IREF/∆ T |
R1=10kΩ |
,R2=∞ |
- |
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- |
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- |
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A |
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Over Full |
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0.4 |
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1.2 |
0.4 |
1.2 |
0.4 |
1.2 |
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TA =Full Range |
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Temperature |
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Range |
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Minimum |
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Cathode Cur- |
IKA(MIN) |
VKA=VREF |
- |
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0.45 |
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1.0 |
- |
0.45 |
1.0 |
- |
0.45 |
1.0 |
mA |
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rent for |
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Regulation |
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Off - Stage |
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VKA=36V, |
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A |
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Cathode |
IKA(OFF) |
- |
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0.05 |
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1.0 |
- |
0.05 |
1.0 |
- |
0.05 |
1.0 |
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VREF=0 |
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Current |
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Dynamic |
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VKA=VREF, |
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Ω |
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Impedance |
ZKA |
IKA=1 to 100mA |
- |
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0.15 |
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0.5 |
- |
0.15 |
0.5 |
- |
0.15 |
0.5 |
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f ≥ 1.0kHz |
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• TMIN = -25° C, TMAX = +85° C
3
KA431S/KA431SA/KA431SL
Test Circuits
KA431S
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KA431S |
Figure 1. Test Circuit for VKA=VREF |
Figure 2. Test Circuit for VKA≥ VREF |
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KA431S
Figure 3. Test Circuit for lKA(OFF)
4