Fairchild KA431SAMF, KA431SAMF2, KA431SLMF, KA431SLMF2, KA431SMF Schematic [ru]
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KA431S/KA431SA/KA431SL
Programmable Shunt Regulator
www.fairchildsemi.com
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
• Tem perature Compensated for Operation Over Full Rated
Operating Temperature Range
• Low Output Noise Voltage
• Fast Turn-on Response
Internal Block Diagram
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 V
(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
2
1
MF- 1.Cathode 2. Ref 3. Anode
MF2- 1. Ref 2. Cathode 3. Anode
REF
REFERENCE
REFERENCE (R)
©2005 Fairchild Semiconductor Corporation
2.5 Vref
+
-
ANODE
CATHODE (K)
ANODE(A)
CATHODE
Rev. 1.0.6
KA431S/KA431SA/KA431SL
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
Thermal Resistance Junction-Air (Note1,2)
MF Suffix Package
Power Dissipation (Note3,4)
MF Suffix Package
Junction Temperature T
Operating Temperature Range T
Storage Temperature Range T
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. T
JMAX
4. Power dissipation calculation: PD = (TJ - TA)/
= 150
°
C
, Ratings appl y to ambient te m perature at 25
R
θJA
REF
R
P
OPR
STG
°
C
KA
KA
θJA
D
J
37 V
-100 ~ +150 mA
-0.05 ~ +10 mA
350 °C/W
350 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
-36V
1.0 - 100 mA
2
Electrical Characteristics
(TA = +25°C, unless otherwise specified)
KA431S/KA431SA/KA431SL
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
=10mA
I
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
KA431S KA431SA KA431SL
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
µ
A
µ
A
µ
A
•T
MIN
= -25°C, T
MAX
= +85°C
3
KA431S/KA431SA/KA431SL
Test Circuits
KA431S
Figure 1. Test Circuit for VKA=V
KA431S
Figure 3. Test Circuit for l
KA(OFF)
REF
KA431S
Figure 2. Test Circuit for V
KA≥VREF
4
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