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KA431SMF Schematic ( PDF Datasheet ) - Fairchild

Teilenummer KA431SMF
Beschreibung Programmable Shunt Regulator
Hersteller Fairchild
Logo Fairchild Logo 




Gesamt 10 Seiten
KA431SMF Datasheet, Funktion
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
www.DataSheet4U.co5m0ppm/°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
12
MF- 1.Cathode 2. Ref 3. Anode
MF2- 1. Ref 2. Cathode 3. Anode
Internal Block Diagram
REFERENCE
+
-
2.5 Vref
REFERENCE (R)
ANODE
CATHODE (K)
ANODE(A)
CATHODE
©2005 Fairchild Semiconductor Corporation
Rev. 1.0.6






KA431SMF Datasheet, Funktion
KA431S/KA431SA/KA431SL
Typical Performance Characteristics (Continued)
www.DataSheet4U.com
140
120
100
80
60
40
20
0
100p
A
stable
A VKA = Vref
B VKA = 5.0 V @ IK = 10mA
TA = 25oC
stable
B
1n
10n 100n
1!
CL, LOAD CAPACITANCE
10!
Figure 10. Stability Boundary Conditions
5
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
5
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
Anode-Ref. Voltage(V)
Figure 11. Anode-Reference Diode Curve
6

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