AIC AIC431 Adjustable precision shunt regulator Datasheet

AIC431/TL431A/TL431
Adjustable Precision Shunt Regulators
n FEATURES
n DESCRIPTION
l
Unconditionally Stable.
l
Precision Reference Voltage.
AIC431
:2.495V ±0.5%
TL431A
:2.495V ±1.0%
TL431
:2.495V ±1.6%
l
Sink Current Capability: 200mA.
l
Minimum Cathode Current for Regulation: 250µA.
l
Equivalent Full-Range Temperature Coefficient:
50 ppm/°C.
l
Fast Turn-On Response.
l
Low Dynamic Output Impedance: 0.08Ω.
l
Adjustable Output Voltage.
l
Low Output Noise.
l
Space Saving SOT-89, SOT-23, TO-92 and SO8
packages.
n TYPICAL APPLICATION CIRCUIT
V IN
V OUT
+
R1
The AIC431/TL431A/TL431 are 3-terminal adjustable 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 0.08Ω. 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.
+
AIC431
R2
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
ORDER NUMBER
PACKAGING TYPE
S: SMALL OUTLINE
U: SOT-23
X: SOT-89
Z: TO-92
AIC431CS
TL431ACS
TL431CS
(SO-8)
AIC431CUN
TL431ACUN
TL431CUN
(SOT-23)
PIN CONFIGURATION
TOP VIEW
CATHOD
1
8 REF
ANODE
2
7 ANODE
ANODE
3
6 ANODE
NC
4
5 NC
3
FRONT VIEW
1: CATHODE
2: VREF
3: ANODE
1
AIC431CUS
TL431ACUS
TL431CUS
(SOT-23)
2
3
FRONT VIEW
1: VREF
2: CATHODE
3: ANODE
1
AIC431CX
TL431ACX
TL431CX
(SOT-89)
FRONT VIEW
1: VREF
2: ANODE
3: CATHODE
1
AIC431CZ
TL431ACZ
TL431CZ
(TO-92)
2
FRONT VIEW
1: VREF
2: ANODE
3: CATHODE
2
3
1
2
3
n ABSOLUTE MAXIMUM RATINGS
Cathode Voltage ........… … … … … ...............… … … … … ..… … … ...............................30V
Continuous Cathode Current ...................… … … … .… … ...................... -10mA ~ 250mA
Reference Input Current Range
.......… … … … ........… … ..........… … … … … … … …
10mA
Operating Temperature Range .......… … … … .........… … … .........… … … … … . -40°C ~ 85°C
Lead Temperature .......… … … … ..................… … … … … … ..… … … … … … … … … . 260°C
Storage Temperature .......… … … … ..................… … … … … ..… … … … … .. -65°C ~ 150°C
Power Dissipation (Notes 1, 2)
SOT-89 Package .........… … … … ...... 0.80W
TO-92 Package … .......… … … … ....... 0.78W
Note 1: TJ, max = 150°C.
Note 2: Ratings apply to ambient temperature at 25°C.
2
AIC431/TL431A/TL431
n TEST CIRCUITS
IN
IL
IN
VZ
IL
R1
IREF
VZ
AIC431
IREF
IZ
IZ
VREF
R2
VREF
AIC431
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=25°C, unless otherwise specified.)
PARAMETER
Reference Voltage
TEST CONDITIONS
VZ=VREF,
AIC431
IL =10mA (Fig. 1)
TL431A
SYMBOL
VREF
TL431
Deviation of Reference
Input Voltage Over
Temperature (Note 3)
VZ = VREF , IL =10mA,
Ratio of the Change in Reference Voltage to
the Change in Cathode voltage
IZ=10mA
∆VZ=10V-VREF
(Fig. 2)
∆VZ=30V-10V
Reference Input Current
R1 =10KΩ, R2=∞,
IL =10mA (Fig. 2)
Ta = 0°C~ +85°C (Fig. 1)
VDEV
∆VREF
∆VZ
IREF
MIN.
TYP.
MAX.
UNIT
2.482
2.495
2.508
2.470
2.495
2.520
2.455
2.495
2.535
9.0
20
mV
-0.5
-2.0
mV/V
-0.35
-1.5
mV/V
0.8
3.5
µA
V
3
AIC431/TL431A/TL431
Deviation of Reference Input
Current over Temperature
R1 =10KΩ, R2=∞,
IL =10mA
Ta =-20°C ~ +85°C (Fig. 2)
αIREF
0.3
1.2
µA
4
AIC431/TL431A/TL431
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Minimum Cathode current for
Regulation
VZ=VREF (Fig. 1)
IZ(MIN)
0.25
0.5
mA
Off-State Current
VZ=20V, VREF =0V (Fig. 3)
IZ(OFF)
0.1
1.0
µA
Dynamic Output Impedance
(Note 4)
VZ=VREF
Frequency= 0Hz (Fig. 1)
RZ
0.08
0.3
Ω
Where:
T2−T1=full temperature change.
αVREF can be positive or negative depending on
whether the slope is positive or negative.
Example: VDEV= 9.0mV, VREF= 2495mV,
T2−T1= 70°C, slope is negative.
VMAX
VDEV = V MAX-V MIN
VMIN
αVREF
T1
 9.0mV  106
 2495mV 
=
= −50ppm/ °C
70°C
T2
TEMPERATURE
Note 3. Deviation of reference input voltage, VDEV, is defined as the maximum variation of the reference input
voltage over the full temperature range.
Note 4. The dynamic output impedance, Rz, is defined as:
The average temperature coefficient of the reference input voltage, αVREF is d efined as:
 VMAX - VMIN  6

 6
VDEV
±
±
10
10
ppm
VREF(at 25°C) 
VREF(at 25°C) 
∆VREF
= 
= 
°C
T2 − T1
T2 − T1
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:
n TYPICAL
RZ =
rz =
Cathode Current vs Cathode Voltage
Reference Voltage vs Temperature
2.58
VZ =V REF
TA =25° C
VZ =VREF
2.56
IZ(MIN)
Reference Voltage (V)
Cathode Current (µA)
[ ]
∆Vz
R1
≅ Rz 1+
R2
∆Iz
PERFORMANCE CHARACTERISTICS
1000
800
∆VZ
∆IZ
600
400
200
0
-200
IZ =10mA
2.54
VREF =2.535V
2.52
2.50
VREF =2.495V
2.48
2.46
2.44
VREF=2.455V
-400
2.42
-600
-1.0
-0.5
0.0
0.5
1.0
1.5
Cathode Voltage (V)
2.0
2.5
3.0
2.40
-40
-20
0
20
40
60
80
100
120
Temperature (°C )
5
AIC431/TL431A/TL431
n TYPICAL
PERFORMANCE CHARACTERISTICS (Continued)
Reference Input Current vs Temperature
0.28
Dynamic Impedance vs Temperature
R1=10KΩ
R2=∞
IZ =10mA
1.15
1.10
Dynamic Impedance (Ω)
Reference Input Current (µA)
1.20
1.05
1.00
0.95
0.90
0.85
0.80
0.24
V Z=VREF
IZ =1mA to100mA
0.20
F <1KHz
0.16
0.12
0.08
0.04
0.75
0.70
-40
0.00
-40
-20
0
20
40
60
80
100
-20
0
20
60
80
100
120
Temperature (° C)
Temperature (° C)
Off-State Cathode Current vs Temperature
Change in Reference Voltage vs Cathode Voltage
0
2.5
Off-State Cathode Current (µA)
Change in Reference Voltage (mV)
40
120
-1
IZ =10mA
-2
TA =25°C
-3
-4
-5
-6
0
5
10
15
20
25
30
35
40
2.0
VREF=0V
VZ =30V
1.5
1.0
0.5
0.0
-40
-20
0
20
40
60
80
100
120
Temperature (° C)
Cathode Voltage (V)
Small Signal Voltage Amplification
Small Signal Voltage Amplification vs Frequency
80
70
IZ =10mA
60
TA=25° C
Output
50
47µF
40
R1
10K
250
Av
30
+
CIN
V IN
20
R
AIC431
V1
10
0
-1010
100
1k
10k
100k
1M
10M
Frequency (Hz)
Test Circuit For Frequency Response
6
AIC431/TL431A/TL431
n TYPICAL
PERFORMANCE CHARACTERISTICS (Continued)
Pulse Response
RB
Input
220
Pulse
Generator
f=100kHz
OUTPUT
RA
50
Output
AIC431
Test Circuit For Pulse Respnose
Stability Boundary Conditions
100
Cathode Current (mA)
VZ
80
V Z=VREF
Stable
R
60
150
AIC431
CL
40
VIN
Stable
20
0
1E-4
1E-3
0.01
0.1
1
10
Load Capacitance (µF)
The areas between the curves represent condition that
may cause the device oscillate
Test Circuit for Stability Boundary Conditions
Dynamic impedance vs. Frequency
Dynamic Impedance (Ω)
10
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
n SYMBOL
BLOCK DIAGRAM
CATHODE (C)
REF (R)
REF (R)
CATHODE (C)
+
-
AIC431
2.495V
ANODE (A)
ANODE (A)
n APPLICATION EXAMPLES
VIN
VIN
R1B
R
R1A
AIC431
R2A
R2B
AIC431
+
AIC431
ON
C
OFF
LED on when Low Limit<VIN< High Limit
Low Limit ≅ VREF (1+R1B/R2B)
Delay=R x C x
ln ( V V− V
IN
IN
High Limit ≅ VREF (1+R1A/R2A)
Fig. 4 Voltage Monitor
)
REF
Fig. 5 Delay Timer
VIN
R CL
IOUT
IOUT
VIN
AIC431
RS
AIC431
IOUT =VREF/ RCL
IOUT =VREF /RS
Fig. 6 Current Limiter or Current Source
Fig. 7 Constant-Current Sink
8
AIC431/TL431A/TL431
n APPLICATION EXAMPLES (Continued)
VOUT
VIN
VIN
FUSE
VOUT
R1
R1
AIC431
AIC431
R2
R2
VOUT ≅ (1+R1/R2) x VREF
VLIMIT ≅ (1+R1/R2) x VREF
Fig 8. Higher-Current Shunt Regulator
Fig 9.
Crow Bar
VIN
R1A
R1B
AIC431
Output ON when
Low Limit <VIN < High Limit
+
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
MIN
MAX
A
1.35
1.75
A1
0.10
0.25
B
0.33
0.51
C
0.19
0.25
D
4.80
5.00
E
3.80
4.00
H
E
e
e
A
H
5.80
6.20
L
0.40
1.27
SYMBOL
MIN
MAX
A
1.00
1.30
A1
—
0.10
A2
0.70
0.90
b
0.35
0.50
C
0.10
0.25
D
2.70
3.10
E
1.40
1.80
A1
C
B
l
L
SOT-23 (unit: mm)
C
D
L
E
H
θ1
e
e
A
A2
A1
b
l
1.27(TYP)
1.90 (TYP)
H
2.60
3.00
L
0.37
—
θ1
1°
9°
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
A
SYMBOL
MIN
MAX
C
A
1.40
1.60
B
0.36
0.48
C
0.35
0.44
D
4.40
4.60
D1
1.62
1.83
E
2.29
2.60
D1
H
E
L
B
e
e1
l
1.50 (TYP.)
e1
3.00 (TYP.)
H
3.94
4.25
L
0.89
1.20
SYMBOL
MIN
MAX
A
4.32
5.33
SOT-89 MARKING
Part No.
AIC431CX
TL431CX
TL431ACX
l
e
Marking
AC01B
AC02B
AC03B
TO-92 (unit: mm)
A
E
L
C
C
e1
D
0.38 (TYP.)
D
4.40
5.20
E
3.17
4.20
e1
L
1.27 (TYP.)
12.7
-
11
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