Datasheet KA431Z, KA431LZ, KA431LD, KA431D, KA431AZ Datasheet (Fairchild Semiconductor)

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

Typical Performance Characteristic s

KA431/KA431A/KA431L

Figure 4.

Figure 6.

Cathode Curren t v s. Cathode Voltage

Change In Reference Input Voltage vs.

Cathode Voltage

Figure 5.

Cathode Current vs. Cathode Vo ltage

Figure7. Dynamic Impedance Fr equency

Figure 8. Small Signal Voltage Amplification vs. Frequency

Figure 9.

Pulse Response

5

KA431/KA431A/KA431L

Typical Performance Characte ristic s

140

A VKA = Vref

120

B V

= 5.0 V @ IK = 10

KA

C VKA = 10 V @ IK = 10

100

D VKA = 15 V @ IK = 10
TA = 25oC

80

60

40

, CATHODE CURRENT(mA)

K

I

20

0
100p 1n 10n 100n 1µ 10µ

CL, LOAD CAPACITANCE

Figure 10. Stability Boundary Conditions

A

B

mA
mA
mA

C

D

(Continued)

6

Typical Application

KA431/KA431A/KA431L

R

1



V

1

------ -+

=

O



Figure 11. Shunt Regulator

V

ref

R

2

Figure 12. Output Control for

Figure 14. Current Limit or Current Source

VOV

=

minal Fixed RegulatorThree- Ter-

R

1



1

------ -+

ref



R

2



V

1

=

O



Figure 13. High Current Shunt Regulator

Figure 15. Constant-Current Sink

R

1

------ -+

V

ref

R

2

7

KA431/KA431A/KA431L

Mechanical Dimensions

Package

+0.25

4.58

–0.15

Dimensions in millimeters

TO-92

±0.20

4.58

0.46

±0.10

1.27TYP

[1.27

±0.20

3.86MAX

±0.10

1.02

+0.10

–0.05

0.38

±0.40

14.47

1.27TYP

]

3.60

±0.20

[1.27

±0.20

]

0.38

+0.10
–0.05

(0.25)

(R2.29)

8

KA431/KA431A/KA431L

Mechanical Dimensions

Package

6.40

±0.20

±0.008

0.252

#1

#4 #5

#8

(Continued)

MAX

9.60

0.378

8-DIP

±0.008

±0.20

9.20

0.362

Dimensions in millimeters

0.79

0.031

()

±0.10

0.46

2.54

±0.004

0.018

0.100

±0.10

±0.004

1.524

0.060

0~15°

7.62

0.300

0.25

0.010

5.08

0.200

3.40

0.134

+0.10
–0.05

+0.004
–0.002

MAX

±0.20

±0.008

0.33

0.013

MIN

3.30

0.130

±0.30
±0.012

9

KA431/KA431A/KA431L

Mechanical Dimensions

Package

#1

#4

(Continued)

8-SOP

1.55

0.061

#8

5.13

#5

±0.20

±0.008

MAX

0.202

Dimensions in millimeters

0.1~0.25

MIN

0.004~0.001

0.56

0.022

()

±0.008

±0.20

4.92

0.194

±0.10

±0.004

0.006

-0.002

0.50

0.020

+

0.004

±0.20

±0.008

0.15

-0.05

+

0.10

6.00

0.236

3.95

0.156

5.72

0.225

±0.30

±0.012

±0.20

±0.008

0.071

0~8°

1.80
MAX

MAX0.10

MAX0.004

1.27

0.050

0.41

0.016

10

Ordering Information

Product Number Output Voltage Tolerance Package Operating Temperature

KA431LZ
KA431LD 8-SOP
KA431AZ

KA431AD 8-SOP

KA431
KA431Z TO-92
KA431D 8-SOP

0.5%

1%

2%

TO-92

TO-92

-25 ~ +85°C

8-DIP

KA431/KA431A/KA431L

11

KA431/KA431A/KA431L

DISCLAIMER

FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURT HER NOTICE TO ANY
PRODUCTS HEREI N TO IMPROVE RELIABILITY, FUNCTIO N OR DESIGN. FAIRCH IL D 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 IT S PATENT RIGHTS, NOR THE RIGHTS OF OTHE RS.

LIFE SUPPORT POL I CY

FAIRCHILD’S PR ODUCTS ARE NOT AUTH ORIZED FOR USE AS C RITICAL COMPONENT S IN LIFE SUPPORT DE VICES
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

2. A critical component in any component of a life support
device or sy stem whose fai lure to perform can be
reasonably expec ted to cause the failur e of the life support
device or system, or to affect its safety or effec t iv ene ss .

instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.

www.fairchildsemi.com

8/20/02 0.0m 001

 2002 Fairchild Semiconductor Corporation

Stock#DSxxxxxxxx