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AIC431/TL431A/TL431
Adjustable Precision Shunt Regulators
n FEATURES
l l
n DESCRIPTION
The AIC431/TL431A/TL431 are 3-terminal a djustable precision shunt regulators with guaranteed temperature stability over the applicable extended commercial temperature range. The output voltage may be set at any level greater than 2.495V (V REF) up to 30V merely by selecting two external resistors that act as a voltage divider network. These devices have a typical output impedance of 0.08. Active output circuitry provides a very sharp turn-on characteristics, making these devices excellent improved replacements for zener diodes in many applications. The precise 0.5% reference voltage tolerance of the AIC431 makes it possible in many applications to avoid the use of a variable resistor, consequently saving cost and eliminating drift and reliability problems associated with it.
Unconditionally Stable. Precision Reference Voltage. AIC431 TL431A TL431 :2.495V 0.5% :2.495V 1.0% :2.495V 1.6%
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Sink Current Capability: 200mA. Minimum Cathode Current for Regulation: 250A. Equivalent Full-Range Temperature Coefficient: 50 ppm/C. Fast Turn-On Response. Low Dynamic Output Impedance: 0.08. Adjustable Output Voltage. Low Output Noise. Space Saving SOT-89, SOT-23, TO-92 and SO8 packages.
l l l l l
n TYPICAL APPLICATION CIRCUIT
VIN + AIC431
R2 R1
VOUT +
VOUT=(1+R1/R2)VREF
Precision Regulator
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC DS-431-06 May 31, 01 TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1
AIC431/TL431A/TL431
n ORDERING INFORMATION
AIC431 CX TL431A CX TL431 CX
PACKAGING TYPE S: SMALL OUTLINE U: SOT-23 X: SOT-89 Z: TO-92
ORDER NUMBER
AIC431CS TL431ACS TL431CS (SO-8)
PIN CONFIGURATION
TOP VIEW
CATHOD ANODE ANODE NC 1 2 3 4 8 REF 7 ANODE 6 ANODE 5 NC
AIC431CUN TL431ACUN TL431CUN (SOT-23)
FRONT VIEW 1: CATHODE 2: VREF 3: ANODE
3
1
2 3
AIC431CUS TL431ACUS TL431CUS (SOT-23)
FRONT VIEW 1: VREF 2: CATHODE 3: ANODE
1
2
AIC431CX TL431ACX TL431CX (SOT-89)
FRONT VIEW 1: VREF 2: ANODE 3: CATHODE
1
2
3
AIC431CZ TL431ACZ TL431CZ (TO-92)
FRONT VIEW 1: VREF 2: ANODE 3: CATHODE
1 2 3
n ABSOLUTE MAXIMUM RATINGS
Cathode Voltage ........... ... ... ... ... .................. ... ... ... ... ..... ... ... ...............................30V Continuous Cathode Current ...................... ... ... ... .... ... ...................... -10mA ~ 250mA Reference Input Current Range .......... ... ... ... ........... ... ............. ... ... ... ... ... ... ... 10mA
Operating Temperature Range .......... ... ... ... ............ ... ... ............ ... ... ... ... . -40C ~ 85C Lead Temperature .......... ... ... ... ..................... ... ... ... ... ... ..... ... ... ... ... ... ... ... ... . 260C Storage Temperature .......... ... ... ... ..................... ... ... ... ... ..... ... ... ... ... .. -65C ~ 150C Power Dissipation (Notes 1, 2) SOT-89 Package ............ ... ... ... ...... 0.80W
TO-92 Package ... .......... ... ... ... ....... 0.78W Note 1: TJ, max = 150C. Note 2: Ratings apply to ambient temperature at 25C.
2
AIC431/TL431A/TL431
n TEST CIRCUITS
IN
IN IL
R1
IL VZ AIC431 IZ
VZ IREF IZ VREF AIC431
R2
IREF
VREF
Note: V Z=V REF(1+R1/R2)+IREFxR1
Fig. 1 Test Circuit for VZ=VREF
Fig. 2 Test circuit for VZ>VREF
IN
VZ AIC431 IZ(OFF)
Fig. 3 Test circuit for off-state Current
n ELECTRICAL CHARACTERISTICS (Ta=25C, unless otherwise specified.)
PARAMETER TEST CONDITIONS VZ=VREF, Reference Voltage IL =10mA (Fig. 1) AIC431 TL431A TL431 Deviation of Reference Input Voltage Over Temperature (Note 3) Ratio of the Change in Reference Voltage to the Change in Cathode voltage Reference Input Current VZ = VREF , IL =10mA, Ta = 0C~ +85C (Fig. 1) IZ=10mA (Fig. 2) VZ=10V-VREF VZ=30V-10V VDEV 9.0 20 mV VREF
SYMBOL
MIN. 2.482 2.470 2.455
TYP. 2.495 2.495 2.495
MAX. 2.508 2.520 2.535
UNIT
V
VREF VZ IREF
-0.5 -0.35 0.8
-2.0 -1.5 3.5
mV/V mV/V A
R1 =10K, R2=, IL =10mA (Fig. 2)
3
AIC431/TL431A/TL431
Deviation of Reference Input Current over Temperature R1 =10K, R2=, IL =10mA Ta =-20C ~ +85C (Fig. 2)
IREF
0.3
1.2
A
4
AIC431/TL431A/TL431
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER Minimum Cathode current for Regulation Off-State Current Dynamic Output Impedance (Note 4) TEST CONDITIONS VZ=VREF (Fig. 1) VZ=20V, VREF =0V (Fig. 3) VZ=VREF Frequency= 0Hz (Fig. 1)
SYMBOL
MIN.
TYP. 0.25 0.1 0.08
MAX. 0.5 1.0 0.3
UNIT mA A
IZ(MIN) IZ(OFF) RZ
VMAX
VDEV = VMAX-VMIN VMIN
Where: T2-T1=full temperature change. VREF can be positive or negative depending on whether the slope is positive or negative. Example: VDEV= 9.0mV, VREF= 2495mV, T2-T1= 70C, slope is negative.
VREF =
T1 TEMPERATURE T2
9.0mV 106 2495mV
70C
= -50ppm/ C
Note 3. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input voltage over the full temperature range. The average temperature coefficient of the reference input voltage, VREF is d efined as: VMAX - VMIN 6 6 VDEV 10 10 ppm VREF(at 25C) VREF(at 25C) VREF = = C T2 - T1 T2 - T1
Note 4. The dynamic output impedance, Rz, is defined as: RZ =
VZ IZ
When the device is programmed with two external resistors, R1 and R2, (see Fig. 2), the dynamic output impedance of the overall circuit, is defined as:
rz =
Vz R1 Rz 1+ R2 Iz
[]
n TYPICAL
1000 800 600 400 200 0 -200 -400
PERFORMANCE CHARACTERISTICS
Reference Voltage vs Temperature
2.58 2.56
Cathode Current vs Cathode Voltage VZ =V REF TA =25 C
VZ =VREF IZ =10mA VREF =2.535V
Reference Voltage (V)
IZ(MIN)
Cathode Current (A)
2.54 2.52 2.50 2.48 2.46 2.44 2.42
VREF =2.495V
VREF=2.455V
-20 0 20 40 60 80 100 120
-600 -1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
2.40 -40
Cathode Voltage (V)
Temperature (C )
5
AIC431/TL431A/TL431
n TYPICAL
1.20
PERFORMANCE CHARACTERISTICS (Continued)
0.28
Reference Input Current vs Temperature Reference Input Current (A) Dynamic Impedance ()
1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80 0.75 0.70 -40
Dynamic Impedance vs Temperature
R1=10K R2= IZ =10mA
0.24
V Z=VREF IZ =1mA to100mA F <1KHz
0.20 0.16
0.12
0.08
0.04
0.00 -40 -20 0 20 40 60 80 100 120
-20
0
20
40
60
80
100
120
Temperature ( C)
Temperature ( C)
Change in Reference Voltage vs Cathode Voltage Change in Reference Voltage (mV)
0 2.5
Off-State Cathode Current vs Temperature Off-State Cathode Current (A)
-1
2.0
IZ =10mA TA =25C
VREF=0V
1.5
-2
VZ =30V
-3
1.0
-4
-5
0.5
-6 0 5 10 15 20 25 30 35 40
0.0 -40
-20
0
20
40
60
80
100
120
Cathode Voltage (V)
Temperature ( C)
Small Signal Voltage Amplification vs Frequency Small Signal Voltage Amplification
80 70 60 50 40 30 20 10 0
-10 10
IZ =10mA TA=25 C
47F R1 10K R 250 AIC431
Output
Av
+ V IN CIN
V1
100
1k
10k
100k
1M
10M
Frequency (Hz)
Test Circuit For Frequency Response
6
AIC431/TL431A/TL431
n TYPICAL
PERFORMANCE CHARACTERISTICS (Continued)
Pulse Response Input
Pulse Generator f=100kHz
RB 220 OUTPUT
Output
RA 50
AIC431
Test Circuit For Pulse Respnose
Stability Boundary Conditions
100
Cathode Current (mA)
VZ
80
V Z=VREF
60
Stable
CL AIC431
R 150
40
Stable
20
VIN
Load Capacitance (F) The areas between the curves represent condition that may cause the device oscillate Dynamic impedance vs. Frequency
10
0 1E-4
1E-3
0.01
0.1
1
10
Test Circuit for Stability Boundary Conditions
Dynamic Impedance ()
Iz=10mA TA=25 C
R1 Output 50
1
AIC431 + AC R2 50 + 3V
0.1
GND
1K 10K 100K 1M
Frequency (Hz)
7
AIC431/TL431A/TL431
n SYMBOL
CATHODE (C)
n
BLOCK DIAGRAM
REF (R) + CATHODE (C) ANODE (A)
REF (R) AIC431
2.495V
-
ANODE (A)
n APPLICATION EXAMPLES
VIN R1B R1A
VIN R
AIC431 R2A R2B AIC431
+ ON OFF C
AIC431
LED on when Low Limitln ( V VV -
IN IN
)
REF
Fig. 5 Delay Timer
VIN
IOUT
R CL VIN
IOUT
AIC431
AIC431
RS
IOUT =VREF/ RCL Fig. 6 Current Limiter or Current Source
IOUT =VREF /RS Fig. 7 Constant-Current Sink
8
AIC431/TL431A/TL431
n APPLICATION EXAMPLES (Continued)
VIN R1 VOUT
VIN
FUSE R1
VOUT
AIC431 R2
AIC431 R2
VOUT (1+R1/R2) x VREF Fig 8. Higher-Current Shunt Regulator
VIN R1A R1B AIC431 Output ON when Low Limit VLIMIT (1+R1/R2) x VREF Fig 9. Crow Bar
+ AIC431 R2A R2B VBE
Low Limit VREF ( 1+ R1B/ R2B )+ VBE High Limit VREF ( 1+ R1A/ R2A ) Fig 10. Over-Voltage/Under-Voltage Protection Circuit
9
AIC431/TL431A/TL431
n PHYSICAL DIMENSIONS
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL A A1
H E
MIN 1.35 0.10 0.33 0.19 4.80 3.80
MAX 1.75 0.25 0.51 0.25 5.00 4.00 1.27(TYP) 6.20 1.27
B C D E e
e A C A1
H L
L
5.80 0.40
B
l
SOT-23 (unit: mm)
D C L E H 1
SYMBOL A A1 A2 b C D E
MIN 1.00 -- 0.70 0.35 0.10 2.70 1.40
MAX 1.30 0.10 0.90 0.50 0.25 3.10 1.80
e
A2
A A1 b
e H L
c1
1.90 (TYP) 2.60 0.37 1 3.00 -- 9
l
SOT-23 MARKING
Part No. AIC431CUN TL431CUN TL431ACUN Marking AC1N AC2N AC3N Part No. AIC431CUS TL431CUS TL431ACUS Marking AC1S AC2S AC3S
10
AIC431/TL431A/TL431
n PHYSICAL DIMENSIONS (Continued)
l SOT-89 (unit: mm)
D D1 C A
SYMBOL A B C D
MIN 1.40 0.36 0.35 4.40 1.62 2.29
MAX 1.60 0.48 0.44 4.60 1.83 2.60 1.50 (TYP.) 3.00 (TYP.)
H E
D1 E e
L e e1 B
e1 H L 3.94 0.89
4.25 1.20
l
SOT-89 MARKING
Part No. AIC431CX TL431CX TL431ACX Marking AC01B AC02B AC03B
l
TO-92 (unit: mm)
L C E
SYMBOL A C
MIN 4.32
MAX 5.33 0.38 (TYP.)
A
e1 D
D E e1 L
4.40 3.17 1.27 (TYP.) 12.7
5.20 4.20
-
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