TL431ACS [AIC]
Adjustable Precision Shunt Regulators; 可调式精密并联稳压器
| 型号： | TL431ACS |
| 厂家： | 
ANALOG INTERGRATIONS CORPORATION |
| 描述： | Adjustable Precision Shunt Regulators |
| 文件： | 总11页 (文件大小：193K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AIC431/TL431A/TL431
Adjustable Precision Shunt Regulators
FEATURES
DESCRIPTION
n
n
The AIC431/TL431A/TL431 are 3-terminal ad-
justable precision shunt regulators with guar-
anteed temperature stability over the applica-
ble extended commercial temperature range.
The output voltage may be set at any level
greater than 2.495V (VREF) up to 30V merely
by selecting two external resistors that act as
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: 250mA.
a voltage divider network. These devices have
a typical output impedance of 0.08W. Active
output circuitry provides a very sharp turn-on
characteristics, making these devices excel-
lent improved replacements for zener diodes
in many applications.
l Equivalent Full-Range Temperature Coefficient:
50 ppm/°C.
l Fast Turn-On Response.
l Low Dynamic Output Impedance: 0.08W.
l Adjustable Output Voltage.
l Low Output Noise.
l Space Saving SOT-89, SOT-23, TO-92 and SO8
The precise ±0.5% reference voltage toler-
ance of the AIC431 makes it possible in
many applications to avoid the use of a vari-
able resistor, consequently saving cost and
eliminating drift and reliability problems asso-
ciated with it.
packages.
TYPICAL APPLICATION CIRCUIT
n
VIN
VOUT
+
+
R1
R2
AIC431
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
ORDERING INFORMATION
n
AIC431 CX
TL431A CX
TL431 CX
ORDER NUMBER
PIN CONFIGURATION
TOP VIEW
AIC431CS
TL431ACS
TL431CS
(SO-8)
1
REF
CATHOD
ANODE
ANODE
NC
8
7
6
5
PACKAGING TYPE
S: SMALL OUTLINE
U: SOT-23
ANODE
ANODE
NC
2
3
4
X: SOT-89
Z: TO-92
3
FRONT VIEW
1: CATHODE
2: VREF
AIC431CUN
TL431ACUN
TL431CUN
(SOT-23)
3: ANODE
1
2
3
FRONT VIEW
1: VREF
2: CATHODE
3: ANODE
AIC431CUS
TL431ACUS
TL431CUS
(SOT-23)
1
2
FRONT VIEW
1: VREF
2: ANODE
AIC431CX
TL431ACX
TL431CX
(SOT-89)
3: CATHODE
1
2
3
FRONT VIEW
1: VREF
2: ANODE
AIC431CZ
TL431ACZ
TL431CZ
(TO-92)
1
3: CATHODE
2
3
ABSOLUTE MAXIMUM RATINGS
n
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: T
= 150°C.
Note 2: Ratings apply to ambient temperature at 25°C.
J, max
2
AIC431/TL431A/TL431
TEST CIRCUITS
n
IN
IL
VZ
IN
IL
R1
AIC431
IREF
VZ
IREF
IZ
IZ
R2
VREF
VREF
AIC431
Note: VZ=VREF(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
ELECTRICAL CHARACTERISTICS (Ta=25°C, unless otherwise specified.)
n
SYMBOL
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
VZ=VREF
,
AIC431
2.482
2.495
2.508
IL =10mA (Fig. 1)
TL431A
TL431
2.470
2.455
2.495
2.495
2.520
2.535
Reference Voltage
VREF
V
Deviation of Reference
Input Voltage Over
Temperature (Note 3)
VZ = VREF , IL =10mA,
VDEV
9.0
20
mV
Ta = 0°C~ +85°C (Fig. 1)
Ratio of the Change in Refer-
ence Voltage to
the Change in Cathode volt-
age
IZ=10mA
(Fig. 2)
DVZ=10V-VREF
DVZ=30V-10V
-0.5
-0.35
0.8
-2.0
-1.5
3.5
mV/V
mV/V
mA
DVREF
DVZ
Reference Input Current
R1 =10KW, R2=¥ ,
IL =10mA (Fig. 2)
IREF
3
AIC431/TL431A/TL431
Deviation of Reference Input
Current over Temperature
R1 =10KW, R2=¥ ,
IL =10mA
a IREF
0.3
1.2
mA
Ta =-20°C ~ +85°C (Fig. 2)
4
AIC431/TL431A/TL431
ELECTRICAL CHARACTERISTICS (Continued)
n
SYMBOL
PARAMETER
TEST CONDITIONS
VZ=VREF (Fig. 1)
MIN.
TYP.
MAX.
UNIT
Minimum Cathode current for
Regulation
IZ(MIN)
0.25
0.5
mA
Off-State Current
VZ=20V, VREF =0V (Fig. 3)
IZ(OFF)
RZ
0.1
1.0
0.3
mA
Dynamic Output Impedance
VZ=VREF
0.08
W
(Note 4)
Frequency= 0Hz (Fig. 1)
Where:
T2- T1=full temperature change.
VMAX
a VREF 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.
VDEV = VMAX-VMIN
VMIN
9.0mV
6
é
ê
ë
ù
ú
û
10
2495mV
aVREF =
= - 50ppm/°C
70°C
T1
T2
TEMPERATURE
Note 4. The dynamic output impedance, R , is de-
fined as:
Note 3. Deviation of reference input voltage, VDEV, is de-
fined as the maximum variation of the reference input
voltage over the full temperature range.
z
DVZ
RZ =
DIZ
The average temperature coefficient of the reference in-
put voltage, a VREF is defined as:
When the device is programmed with two external re-
sistors, R1 and R2, (see Fig. 2), the dynamic output
impedance of the overall circuit, is defined as:
é
ù
é
ù
VMAX- VMIN
VREF(at 25°C)
T2 - T1
VDEV
VREF(at25°C)
T2 - T1
6
6
±
10
±
10
ú
ê
ú
ê
DVz
DIz
R1
R2
ppm
ë
û
ë
û
rz =
@ Rz
1+
DVREF
=
=
°C
TYPICAL PERFORMANCE CHARACTERISTICS
n
Cathode Current vs Cathode Voltage
Reference Voltage vs Temperature
1000
800
600
400
200
0
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
2.40
VZ =VREF
VZ =VREF
IZ =10mA
°
TA =25 C
IZ(MIN)
VREF=2.535V
VREF=2.495V
-200
-400
-600
VREF=2.455V
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
-40
-20
0
20
40
60
80
100
120
Cathode Voltage (V)
°
Temperature ( C)
5
AIC431/TL431A/TL431
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
n
Dynamic Impedance vs Temperature
Reference Input Current vs Temperature
0.28
0.24
0.20
0.16
0.12
0.08
0.04
0.00
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
W
R1=10K
VZ=VREF
R2=¥
IZ=10mA
IZ=1mA to100mA
F <1KHz
-40
-20
0
20
40
60
80
100
120
-40
-20
0
20
40
60
80
100
120
°
Temperature ( C)
°
Temperature ( C)
Off-State Cathode Current vs Temperature
Change in Reference Voltage vs Cathode Voltage
0
-1
-2
-3
-4
-5
-6
2.5
2.0
1.5
1.0
0.5
0.0
IZ =10mA
VREF=0V
VZ=30V
TA =25°C
0
5
10
15
20
25
30
35
40
-40
-20
0
20
40
60
80
100
120
°
Temperature ( C)
Cathode Voltage (V)
Small Signal Voltage Amplification vs Frequency
IZ =10mA
80
70
60
50
40
30
20
10
0
Output
°
TA=25 C
R1
10K
R
m
47 F
250
Av
+
CIN
AIC431
VIN
V1
-10
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Test Circuit For Frequency Response
6
AIC431/TL431A/TL431
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
n
Pulse Response
RB
Input
220
OUTPUT
AIC431
Pulse
Generator
f=100kHz
RA
50
Output
Test Circuit For Pulse Respnose
Stability Boundary Conditions
100
80
60
40
20
0
VZ
VZ=VREF
Stable
R
150
AIC431
CL
VIN
Stable
1E-4
1E-3
0.01
0.1
1
10
m
Load Capacitance ( F)
The areas between the curves represent condition that
may cause the device oscillate
Test Circuit for Stability Boundary Conditions
Dynamic impedance vs. Frequency
10
Iz=10mA
°
TA=25 C
R1
Output
50
1
AIC431
+
R2
50
AC
3V
+
0.1
GND
1K
10K
100K
1M
Frequency(Hz)
7
AIC431/TL431A/TL431
n
SYMBOL
BLOCK DIAGRAM
n
n
CATHODE (C)
REF (R)
+
REF (R)
-
AIC431
2.495V
ANODE (A)
ANODE (A)
APPLICATION EXAMPLES
V
IN
V
IN
R1B
R
R1A
AIC431
AIC431
R2A
AIC431
+
R2B
ON
C
OFF
LED on when Low Limit<VIN< High Limit
V
IN
Low Limit @ VREF (1+R1B/R2B)
Delay=R x C x
ln (
)
V
IN- VREF
High Limit @ VREF (1+R1A/R2A)
Fig. 4 Voltage Monitor
Fig. 5Delay Timer
VIN
IOUT
I
OUT
R
CL
V
IN
AIC431
R S
AIC431
IOUT=VREF/ RCL
Fig. 6 Current Limiter or Current Source
IOUT=VREF /RS
Fig. 7 Constant-Current Sink
8
AIC431/TL431A/TL431
APPLICATION EXAMPLES (Continued)
n
VOUT
FUSE
V
VIN
V
OUT
IN
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
V
IN
R1B
R1A
AIC431
Output ON when
Low Limit <V < High Limit
IN
+
AIC431
V
BE
R2A
R2B
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
PHYSICAL DIMENSIONS
n
l 8 LEAD PLASTIC SO (unit: mm)
D
SYMBOL
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
A
A1
B
H
E
C
D
E
e
e
1.27(TYP)
A
H
L
5.80
0.40
6.20
1.27
C
B
L
l SOT-23 (unit: mm)
C
SYMBOL
MIN
MAX
1.30
0.10
0.90
0.50
0.25
3.10
1.80
D
A
A1
A2
b
1.00
—
L
0.70
0.35
0.10
2.70
1.40
E
H
C
q
1
e
D
E
A
e
1.90 (TYP)
A2
H
2.60
0.37
1°
3.00
—
A1
L
b
θ1
9°
l SOT-23 MARKING
Part No.
Marking
AC1N
AC2N
AC3N
Part No.
AIC431CUS
TL431CUS
Marking
AIC431CUN
TL431CUN
TL431ACUN
AC1S
AC2S
AC3S
TL431ACUS
10
AIC431/TL431A/TL431
PHYSICAL DIMENSIONS (Continued)
n
l SOT-89 (unit: mm)
A
D
SYMBOL
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
D1
A
B
C
C
D
D1
E
H
E
L
e
1.50 (TYP.)
3.00 (TYP.)
B
e
e1
H
L
e1
3.94
0.89
4.25
1.20
l SOT-89 MARKING
Part No.
Marking
AC01B
AC02B
AC03B
AIC431CX
TL431CX
TL431ACX
l TO-92 (unit: mm)
SYMBOL
MIN
4.32
MAX
5.33
E
L
A
A
C
D
E
C
0.38 (TYP.)
e1
4.40
3.17
5.20
4.20
D
e1
L
1.27 (TYP.)
12.7
-
11
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