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PDF TL431 Data sheet ( Hoja de datos )

Número de pieza TL431
Descripción PROGRAMMABLE PRECISION REFERENCES
Fabricantes Motorola Semiconductors 
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1. Precision Shunt Regulator - TI






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Order this document by TL431/D
Programmable
Precision References
The TL431, A, B integrated circuits are three–terminal programmable
shunt regulator diodes. These monolithic IC voltage references operate as a
low temperature coefficient zener which is programmable from Vref to 36 V
with two external resistors. These devices exhibit a wide operating current
range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 . The
characteristics of these references make them excellent replacements for
zener diodes in many applications such as digital voltmeters, power
supplies, and op amp circuitry. The 2.5 V reference makes it convenient to
obtain a stable reference from 5.0 V logic supplies, and since the TL431, A,
B operates as a shunt regulator, it can be used as either a positive or
negative voltage reference.
Programmable Output Voltage to 36 V
Voltage Reference Tolerance: ±0.4%, Typ @ 25°C (TL431B)
Low Dynamic Output Impedance, 0.22 Typical
Sink Current Capability of 1.0 mA to 100 mA
Equivalent Full–Range Temperature Coefficient of 50 ppm/°C Typical
Temperature Compensated for Operation over Full Rated Operating
Temperature Range
Low Output Noise Voltage
TL431, A, B
Series
PROGRAMMABLE
PRECISION REFERENCES
SEMICONDUCTOR
TECHNICAL DATA
LP SUFFIX
PLASTIC PACKAGE
CASE 29
(TO–92)
123
Pin 1. Reference
2. Anode
3. Cathode
8
1
8
1
P SUFFIX
PLASTIC PACKAGE
CASE 626
DM SUFFIX
PLASTIC PACKAGE
CASE 846A
(Micro–8)
ORDERING INFORMATION
Device
Operating
Temperature Range
TL431CLP, ACLP, BCLP
TL431CP, ACP, BCP
TL431CDM, ACDM, BCDM
TA = 0° to +70°C
TL431CD, ACD, BCD
TL431ILP, AILP, BILP
TL431IP, AIP, BIP
TL431IDM, AIDM, BIDM
TA = –40° to +85°C
TL431ID, AID, BID
MOTOROLA ANALOG IC DEVICE DATA
Package
TO–92
Plastic
Micro–8
SOP–8
TO–92
Plastic
Micro–8
SOP–8
Cathode 1
N/C 2
N/C 3
N/C 4
8 Reference
7 N/C
6 Anode
5 N/C
(Top View)
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SOP–8)
8
1
Cathode 1
Anode
2
3
N/C 4
8 Reference
7
Anode
6
5 N/C
(Top View)
SOP–8 is an internally modified SO–8 package. Pins 2,
3, 6 and 7 are electrically common to the die attach flag.
This internal lead frame modification decreases power
dissipation capability when appropriately mounted on a
printed circuit board. SOP–8 conforms to all external
dimensions of the standard SO–8 package.
© Motorola, Inc. 1998
Rev 6
1

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TL431 pdf
Figure 1. Test Circuit for VKA = Vref
Input IK VKA
Vref
TL431, A, B Series
Figure 2. Test Circuit for VKA > Vref
Figure 3. Test Circuit for Ioff
Input
R1 Iref
R2
Vref
VKA
IK
ǒ Ǔ+ ) )VKA
Vref 1
R1
R2
Iref S R1
Input
Ioff VKA
Figure 4. Cathode Current versus
Cathode Voltage
150
VKA = Vref
TA = 25°C
100 Input
VKA
IK
50
0
–50
–100
–2.0
–1.0 0 1.0
VKA, CATHODE VOLTAGE (V)
2.0
3.0
Figure 5. Cathode Current versus
Cathode Voltage
800
VKA = Vref
TA = 25°C
600 Input
IKVKA
IMin
400
200
0
–20–01.0
0 1.0 2.0
VKA, CATHODE VOLTAGE (V)
3.0
Figure 6. Reference Input Voltage versus
2600
2580 Input
2560 Vref
Ambient Temperature
VKA
IKVKA = Vref
IK = 10 mA
Vref Max = 2550 mV
2540
2520
2500 Vref Typ = 2495 mV
2480
2460
2440 Vref Min = 2440 mV
2420
2400
–55 –25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
Figure 7. Reference Input Current versus
Ambient Temperature
3.0
2.5
2.0
1.5
IK = 10 mA
1.0 Input
VKA
10k Iref IK
0.5
0–55 –25 0 25 50 75 100 125
TA, AMBIENT TEMPERATURE (°C)
MOTOROLA ANALOG IC DEVICE DATA
5

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TL431 arduino
TL431, A, B Series
APPLICATIONS INFORMATION
The TL431 is a programmable precision reference which
is used in a variety of ways. It serves as a reference voltage
in circuits where a non–standard reference voltage is
needed. Other uses include feedback control for driving an
optocoupler in power supplies, voltage monitor, constant
current source, constant current sink and series pass
regulator. In each of these applications, it is critical to
maintain stability of the device at various operating currents
and load capacitances. In some cases the circuit designer
can estimate the stabilization capacitance from the stability
boundary conditions curve provided in Figure 15. However,
these typical curves only provide stability information at
specific cathode voltages and at a specific load condition.
Additional information is needed to determine the
capacitance needed to optimize phase margin or allow for
process variation.
A simplified model of the TL431 is shown in Figure 31.
When tested for stability boundaries, the load resistance is
W150 . The model reference input consists of an input
transistor and a dc emitter resistance connected to the
device anode. A dependent current source, Gm, develops a
current whose amplidute is determined by the difference
between the 1.78 V internal reference voltage source and the
input transistor emitter voltage. A portion of Gm flows through
compensation capacitance, CP2. The voltage across CP2
drives the output dependent current source, Go, which is
connected across the device cathode and anode.
Model component values are:
Vref = 1.78 V
Gm = 0.3 + 2.7 exp (–IC/26 mA)
where IC is the device cathode current and Gm is in mhos
Go = 1.25 (Vcp2) µmhos.
Resistor and capacitor typical values are shown on the
model. Process tolerances are ± 20% for resistors, ±10% for
capacitors, and ±40% for transconductances.
An examination of the device model reveals the location of
circuit poles and zeroes:
+ + +p pP1
1
2 RGM CP1
1
2 * 1.0 M * 20 pF
7.96 kHz
+ + +p pP2
1
2 RP2CP2
1
2 * 10 M * 0.265 pF
60 kHz
+ + +p pZ1
1
2 RZ1CP1
1
2 * 15.9 k * 20 pF
500 kHz
In addition, there is an external circuit pole defined by the
load:
+PL
2p
1
RLCL
Also, the transfer dc voltage gain of the TL431 is:
+G GMRGMGoRL
Example 1:
+ + +WIC 10 mA, RL 230 , CL 0. Define the transfer gain.
The DC gain is:
+ +G GMRGMGoRL
+ +m(2.138)(1.0 M)(1.25 )(230) 615 56 dB
+ ) + +Loop gain
G
8.25
8.25 k
k
15
k
218
47 dB
The resulting transfer function Bode plot is shown in
Figure 32. The asymptotic plot may be expressed as the
following equation:
)1 jf
ǒ Ǔ500 kHz
+Av 615
ǒ ) Ǔǒ ) Ǔ1 jf 1 jf
8.0 kHz 60 kHz
The Bode plot shows a unity gain crossover frequency of
approximately 600 kHz. The phase margin, calculated from
the equation, would be 55.9 degrees. This model matches
the Open–Loop Bode Plot of Figure 12. The total loop would
have a unity gain frequency of about 300 kHz with a phase
margin of about 44 degrees.
MOTOROLA ANALOG IC DEVICE DATA
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