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Электронный компонент: TL431xxx

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Programmable Output Voltage to 36V
Low Dynamic Output Impedance 0.2
Sink Current Capability of 0.1 mA to 100 mA
Equivalent Full-Range Temperature Coefficient of 50 ppm/
o
C
Temperature Compensated for Operation over Full Rated
Operating Temperature Range
Low Output Noise Voltage
Fast Turn on Response


DESCRIPTION
The
TL431 is a 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 0.2
. Active output circuitry provides a very sharp turn-on
characteristic, making these devices excellent replacement for zener diodes in many applications.
The
TL431 is characterized for operation from 0
o
C to +70
o
C.


SYMBOL FUNCTIONAL BLOCK DIAGRAM

SCHEMATIC DIAGRAM




















R e fe re n c e
(R )
C a th o d e
(K)
A n o d e (A )
2 .5 V
re f
+
-
R e fe re n c e
(R )
C a th o d e
(K )
A n o d e
(A )
Wing Shing Computer Components Co., (H.K.)Ltd.
Tel:(852)2341 9276 Fax:(852)2797 8153
Homepage:
http://www.wingshing.com
E-mail: wsccltd@hkstar.com
SOT
--
--
--
--
23
Adjustable Precision Shunt Regulator
Pin Configuration
4-1
TL431
TO-92
REF
ANODE
CATHODE
SOT-89
REF ANODE CATHODE
TL431CLP
TL431LT1
TL431CPK
1. REF
2. CATHODE
3. ANODE
C
A
R
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
Characteristic Symbol
Value
Unit
Cathode Voltage
V
KA
37
V
Cathode Current Range (Continuous)
I
K
-100 ~ +150
mA
Reference Input Current Range
I
REF
0.05 ~ +10
mA
Operating Temperature Range
T
a
0 ~ +70
o
C
Storage Temperature Range
T
stg
-65 ~ +150
o
C

RECOMMENDED OPERATING CONDITIONS
Characteristic Symbol Test
Condition Min
Typ
Max
Unit
Cathode Voltage
V
KA
V
REF
36 V
Cathode Current
I
K
1.0
100
mA


ELECTRICAL CHARACTERISTICS
(T
a
= 25
o
C, unless otherwise specified)
Characteristic Symbol
Test
Condition
Min
Typ
Max
Unit
Reference Input Voltage
V
REF
V
KA
=
V
REF
, I
K
= 10mA
2.44 2.495 2.55
V
Deviation of Reference
Input Voltage Over-
Temperature (Note 1)
V
REF(dev)
V
KA
=
V
REF
, I
K
= 10mA
T
min
Ta
T
max
4 17
mV
Ratio of Change in
Reference Input Voltage
to the Change in
V
V
R EF
K A
I
K
= 10mA
V
KA
= 10V-V
REF
-1.4
-2.7
mV/V
Cathode Voltage
K
KA
= 36V-10V
-1.0
-2.0
Reference Input Current
I
REF
I
K
= 10mA, R
1
= 10K
, R
2
=
2,0 4
A
Deviation of Reference
Input Current Over Full
Temperature Range
I
REF(dev)
I
K
= 10mA, R
1
= 10K
, R
2
=
Ta = Full Range
0.4 1.2
A
Minimum Cathode
Current for Regulation
I
K(min)
V
KA
=
V
REF
0.4
1.0
mA
Off-State Cathode
Current
I
K(off)
V
KA
=
36V,
V
REF
= 0
0.1
1.0
A
Dynamic Impedance
(Note2)
Z
KA
V
KA
=
V
REF
, I
K
= 10mA to
100mA
f
1.0KHz
0.2 0.5
WS
TL431
4-2

Note: 1. The deviation parameters V
REF(dev)
and I
REF(dev)
are defined as the differences between the maximum and minimum
values obtained over the rated temperature range.
V
REF(dev)
= V
REF
(max) - V
REF
(min)
The equivalent full-range temperature coefficient of the reference input voltage,
V
REF
is defined as:
V
REF
(
)
ppm
C
=
(
)
V
V
@
C
T a
R EF(dev)
R EF
10
6

where
Ta is the rated operating free-air temperature range of the device.

V
REF
can be positive or negative depending on whether minimum
V
REF
or maximum V
REF
respectively, occurs at the lower temperature.

2. The dynamic impedance is defined as:
Z
K A
=
V
I
K A
K
When the device is operated with two external resistors (see Figure 2), the total dynamic impedance of the circuit is
given by:
Z
'
=
V
I
=
Z
K A
(1+
R
R
1
2
)


TEST CIRCUITS

Fig.1. Test Circuit for V
KA
= V
REF
Fig.2. Test Circuit for V
KA



V
REF

Fig.3. Test Circuit for I
off
WS
TL431
4-3


PAD LAYOUT



















PAD LOCATION


Unit:
m
Pad No.
Pad Name
Description
X
Y
1 R Reference
235
400
2 K Cathode
-505
343.5
3 K Cathode
-497.5
-346
4 A
Anode
-177.5
-341.5


Physical Characteristics
Wafers 4
inch 460
40
m (thickness)
Size
1.35
0.99 mm
Scribe width
90
m
Wafer's Backside
Ti Ni Ag: Ti - 0.1
0.02
m
Ni - 0.5
0.1
m
Ag - 0.6
0.1
m
Passivation PSG
T L 4 3 1 PA D D I A G R A M
C h i p size : 1 3 4 5 x 9 9 0
Pa d size :
U n it : m
(0 ,0 )
2
3
4
1
WS
TL431
4-4