TL1431 [TI]
PRECISION PROGRAMMABLE REFERENCE; 精密可编程参考
| 型号： | TL1431 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | PRECISION PROGRAMMABLE REFERENCE |
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
D PACKAGE
(TOP VIEW)
0.4% Initial Voltage Tolerance
0.2-Ω Typical Output Impedance
Fast Turnon . . . 500 ns
CATHODE
ANODE
ANODE
NC
REF
1
2
3
4
8
7
6
5
ANODE
ANODE
NC
Sink Current Capability . . . 1 mA to 100 mA
Low Reference Current (REF)
Adjustable Output Voltage . . . V
to 36 V
I(ref)
NC – No internal connection
ANODE terminals are connected internally.
description
The TL1431 is a precision programmable
reference with specified thermal stability over
LP PACKAGE
(TOP VIEW)
automotive,
temperature ranges. The output voltage can be
set to any value between V (approximately
commercial,
and
military
CATHODE
ANODE
REF
I(ref)
2.5 V) and 36 V with two external resistors (see
Figure 16). This device has a typical output
impedance of 0.2 Ω. Active output circuitry
provides a very sharp turnon characteristic,
making the device an excellent replacement for
zener diodes and other types of references in
applications such as onboard regulation,
adjustable power supplies, and switching power
supplies.
KTP PACKAGE
(TOP VIEW)
CATHODE
ANODE
REF
ANODE
The TL1431C is characterized for operation over
the commercial temperature range of 0°C to
70°C. The TL1431Q is characterized for
operation over the full automotive temperature
range of –40°C to 125°C. The TL1431M is
characterized for operation over the full military
temperature range of –55°C to 125°C.
TheANODEterminalisinelectricalcontactwiththe
mounting base.
FK PACKAGE
(TOP VIEW)
JG PACKAGE
(TOP VIEW)
CATHODE
NC
REF
NC
1
2
3
4
8
7
6
5
3
2
1
20 19
18
NC
ANODE
NC
NC
NC
NC
NC
NC
NC
4
5
6
7
8
NC
NC
17
16
15
14
NC
NC – No internal connection
ANODE
NC
9 10 11 12 13
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2000, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
AVAILABLE OPTIONS
PACKAGED DEVICES
CHIP
FORM
(Y)
PLASTIC
FLANGE
MOUNTED
(KTP)
SMALL
OUTLINE
(D)
CHIP
CARRIER
(FK)
CERAMIC
DIP
T
A
TO-226AA
(LP)
(JG)
0°C to 70°C
–40°C to 125°C
–55°C to 125°C
TL1431CD
TL1431QD
–
TL1431CKTPR
TL1431CLP
TL1431QLP
–
–
–
–
–
–
–
TL1431Y
TL1431MFK
TL1431MJG
TheDandLPpackagesareavailabletapedandreeled.TheKTPpackageisonlyavailabletapedandreeled.Addthesuffix R
to the device type (e.g., TL1431CDR). Chip forms are tested at 25°C.
logic symbol
REF
ANODE
CATHODE
functional block diagram
CATHODE
REF
+
–
V
ref
ANODE
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
†
equivalent schematic
1
CATHODE
800 Ω
800 Ω
8
20 pF
REF
150 Ω
10 kΩ
3.28 kΩ
4 kΩ
20 pF
7.2 kΩ
2.4 kΩ
1 kΩ
800 Ω
2,3,6,7
ANODE
†
All component values are nominal.
Pin numbers shown are for the D package.
3
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Cathode voltage,V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 V
KA
Continuous cathode current range, I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –100 mA to 150 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –50 µA to 10 mA
KA
Reference input current range, I
Package thermal impedance, θ (see Notes 2 and 3): D package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97°C/W
I(ref)
JA
KTP package . . . . . . . . . . . . . . . . . . . . . . . . . 28°C/W
LP package . . . . . . . . . . . . . . . . . . . . . . . . . . 156°C/W
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Storage temperature range, T
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
stg
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder“recommendedoperatingconditions”isnotimplied.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values are with respect to ANODE unless otherwise noted.
2. MaximumpowerdissipationisafunctionofT (max),θ ,andT .Themaximumallowablepowerdissipationatanyallowableambient
J
JA
A
temperature is P = (T (max) – T )/θ . Operating at the absolute maximum T of 150°C can impact reliability.
D
J
A
JA
J
3. The package thermal impedance is calculated in accordance with JESD 51.
POWER DISSIPATION RATING TABLE – FREE-AIR TEMPERATURE
DERATING
T
A
= 25°C
T
A
= 70°C
T
A
= 85°C
T = 125°C
A
PACKAGE
FACTOR ABOVE
= 25°C
POWER RATING
POWER RATING POWER RATING POWER RATING
T
A
FK
JG
1375 mW
1050 mW
11.0 mW/°C
8.4 mW/°C
880 mW
672 mW
715 mW
546 mW
275 mW
210 mW
recommended operating conditions
MIN
MAX
36
UNIT
V
V
Cathode voltage
Cathode current
V
KA
I(ref)
1
I
100
70
mA
KA
TL1431C
0
–40
–55
T
A
Operating free-air temperature
TL1431Q
TL1431M
125
125
°C
4
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
electrical characteristics at specified free-air temperature, I
= 10 mA (unless otherwise noted)
KA
TL1431C
TYP
TEST
CIRCUIT
†
PARAMETER
TEST CONDITIONS
UNIT
T
A
MIN
MAX
25°C
2490
2500
2510
Reference
input voltage
V
V
V
V
= V
= V
Figure 1
mV
Full
range
I(ref)
KA
I(ref)
I(ref)
2480
2520
Deviation of reference input
voltage over full temperature
Full
range
Figure 1
Figure 2
4
20
mV
I(dev)
KA
‡
range
Ratio of change in reference
input voltage to the change in
cathode voltage
VI(ref
Full
range
)
∆V
KA
= 3 V to 36 V
–1.1
1.5
–2 mV/V
2.5
VKA
25°C
Reference
input current
I
R1 = 10 kΩ,
R1 = 10 kΩ,
R2 = ∞
R2 = ∞
Figure 2
µA
Full
range
I(ref)
3
Deviation of reference input
current over full temperature
Full
range
I
Figure 2
Figure 1
0.2
1.2
µA
I(dev)
‡
range
Minimum cathode current for
regulation
V
KA
= V
to 36 V
I(ref)
25°C
25°C
0.45
0.18
1
0.5
2
mA
Off-state
cathode current
I
off
V
V
= 36 V,
V = 0
I(ref)
Figure 3
Figure 1
µA
Full
range
KA
= V
, f ≤ 1 kHz,
I(ref)
KA
§
|z
|
25°C
0.2
0.4
Ω
Output impedance
KA
I
= 1 mA to 100 mA
KA
†
‡
Full range is 0°C to 70°C for C-suffix devices.
The deviation parameters V and I are defined as the differences between the maximum and minimum values obtained over the rated
I(dev)
I(dev)
temperature range. The average full-range temperature coefficient of the reference input voltage
is defined as:
V
(
)
I ref
V
(
)
I dev
106
V
at 25
C
°
Max V
(
)
I ref
I(ref)
I(ref)
ppm
°C
V
TA
(
)
I ref
V
I(dev)
where:
∆T is the rated operating temperature range of the device.
A
Min V
∆T
A
is positive or negative depending on whether minimum V
or maximum V , respectively, occurs at the lower temperature.
I(ref)
I(ref)
V
(
)
I ref
VKA
IKA
§
The output impedance is defined as: zKA
V
I
| |
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: z′
,
R1
R2
which is approximately equal to zKA
1
.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
electrical characteristics at specified free-air temperature, I
= 10 mA (unless otherwise noted)
KA
TL1431Q
TL1431M
TYP
TEST
CIRCUIT
†
PARAMETER
TEST CONDITIONS
UNIT
T
A
MIN
TYP
MAX
MIN
MAX
25°C
2490
2500
2510
2475
2500
2540
Reference
input voltage
V
V
V
V
= V
Figure 1
mV
Full
range
I(ref)
KA
I(ref)
I(ref)
2470
2530
55
2460
2550
55*
Deviation of
Full
range
reference input
voltage over full
temperaturerange
= V
KA
Figure 1
17
17
mV
I(dev)
‡
Ratio of change in
reference input
voltage to the
change in cathode
voltage
VI(ref
Full
range
)
∆V
KA
= 3 V to 36 V
Figure 2
Figure 2
–1.1
1.5
–2
–1.1
1.5
–2 mV/V
VKA
25°C
2.5
4
2.5
Reference
input current
I
R1 = 10 kΩ, R2 = ∞
R1 = 10 kΩ, R2 = ∞
µA
Full
range
I(ref)
5
Deviation of
reference input
current over full
Full
range
I
Figure 2
Figure 1
0.5
2
0.5
3*
µA
I(dev)
‡
temperaturerange
Minimum
cathode current
for regulation
V
KA
= V
to 36 V
I(ref)
25°C
25°C
0.45
0.18
1
0.45
0.18
1
mA
0.5
2
0.5
2
Off-state
cathode current
I
V
V
= 36 V,
V
I(ref)
= 0
Figure 3
Figure 1
µA
Full
range
off
KA
= V
, f ≤ 1 kHz,
I(ref)
KA
§
|z
|
25°C
0.2
0.4
0.2
0.4
Ω
Output impedance
KA
I
= 1 mA to 100 mA
KA
*On products compliant to MIL-PRF-38535, this parameter is not production tested.
†
‡
Full range is –40°C to 125°C for Q-suffix devices, and –55°C to 125°C for M-suffix devices.
The deviation parameters V and I are defined as the differences between the maximum and minimum values obtained over the rated
I(dev)
I(dev)
temperature range. The average full-range temperature coefficient of the reference input voltage
is defined as:
V
(
)
I ref
V
(
)
I dev
106
V
at 25
C
°
Max V
(
)
I ref
I(ref)
I(ref)
ppm
°C
V
TA
(
)
I ref
V
I(dev)
where:
∆T is the rated operating temperature range of the device.
A
Min V
∆T
A
is positive or negative depending on whether minimum V
or maximum V , respectively, occurs at the lower temperature.
I(ref)
I(ref)
V
(
)
I ref
VKA
IKA
§
The output impedance is defined as: zKA
V
I
| |
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: z′
,
R1
R2
which is approximately equal to zKA
1
.
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
electrical characteristics at I
= 10 mA, T = 25°C
A
KA
TL1431Y
TYP
TEST
CIRCUIT
PARAMETER
TEST CONDITIONS
UNIT
MIN
MAX
V
Reference input voltage
V
= V
Figure 1
Figure 2
2490
2500
2510
mV
I(ref)
VI(ref
VKA
KA
I(ref)
Ratio of change in reference input voltage
to the change in cathode voltage
)
∆V
KA
= 3 V to 36 V
–1.1
–2 mV/V
I
I
I
Reference input current
R1 = 10 kΩ,
R2 = ∞
to 36 V
Figure 2
Figure 1
Figure 3
1.44
0.45
0.18
2.5
1
µA
mA
µA
I(ref)
min
Minimum cathode current for regulation
Off-state cathode current
V
KA
V
KA
V
KA
= V
KA
off
I(ref)
= 36 V,
= V
V
ref
= 0
0.5
, f ≤ 1 kHz,
I(ref)
= 1 mA to 100 mA
†
|z
|
Output impedance
Figure 1
0.2
0.4
Ω
KA
I
KA
V
I
†
| |
The output impedance is defined as: z′
VKA
When the device is operating with two external resistors (see Figure 2), the total dynamic impedance of the circuit is given by: zKA
,
IKA
R1
R2
which is approximately equal to zKA
1
.
PARAMETER MEASUREMENT INFORMATION
V
(
)
I dev
106
V
at 25
C
°
Max V
I(ref)
(
)
I ref
ppm
V
°C
TA
(
)
I ref
V
I(dev)
where:
∆T is the rated operating temperature range of the device.
A
Min V
I(ref)
∆T
A
V
KA
Input
V
KA
Input
I
I
KA
KA
R1
I
I(ref)
V
V
I(ref)
R2
I(ref)
R1
R2
V
V
1
I
R1
KA
I(ref)
I(ref)
ref
Figure 1. Test Circuit for V
= V
Figure 2. Test Circuit for V
> V
(KA)
ref
(KA)
7
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
PARAMETER MEASUREMENT INFORMATION
Input
V
KA
I
off
Figure 3. Test Circuit for I
off
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
Reference voltage vs Free-air temperature
4
5
Reference current vs Free-air temperature
Cathode current vs Cathode voltage
6, 7
8
Off-state cathode current vs Free-air temperature
Ratio of delta reference voltage to delta cathode voltage vs Free-air temperature
Equivalent input-noise voltage vs Frequency
Equivalent input-noise voltage over a 10-second period
Small-signal voltage amplification vs Frequency
Reference impedance vs Frequency
9
10
11
12
13
14
15
Pulse response
Stability boundary conditions
8
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
†
TYPICAL CHARACTERISTICS
REFERENCE VOLTAGE
vs
REFERENCE CURRENT
vs
FREE-AIR TEMPERATURE
FREE-AIR TEMPERATURE
2.52
2.51
2.5
2.5
2
I = 10 mA
KA
R1 = 10 kΩ
R2 = ∞
V
= V
= 10 mA
I(ref)
KA
I
KA
1.5
1
2.49
2.48
0.5
0
– 50 – 25
0
25
50
75
100
125
– 50 – 25
0
25
50
75
100
125
T
A
– Free-Air Temperature – °C
T
A
– Free-Air Temperature – °C
Figure 4
Figure 5
CATHODE CURRENT
vs
CATHODE VOLTAGE
CATHODE CURRENT
vs
CATHODE VOLTAGE
800
600
400
200
150
V
T
= V
I(ref)
V
T
= V
I(ref)
KA
A
KA
A
= 25°C
= 25°C
100
50
0
– 50
– 100
– 150
0
– 200
–2
–1
0
1
2
3
4
– 3
– 2
V
– 1
0
1
2
3
V
KA
– Cathode Voltage – V
– Cathode Voltage – V
KA
Figure 6
Figure 7
†
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices.
9
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
†
TYPICAL CHARACTERISTICS
RATIO OF DELTA REFERENCE VOLTAGE TO
DELTA CATHODE VOLTAGE
vs
OFF-STATE CATHODE CURRENT
vs
FREE-AIR TEMPERATURE
0.4
FREE-AIR TEMPERATURE
–0.85
V
KA
= 3 V to 36 V
V
V
= 36 V
KA
= 0
I(ref)
0.35
0.3
–0.95
–1.05
0.25
0.2
–1.15
–1.25
–1.35
–1.45
0.15
0.1
0.05
0
– 25
0
25
50
75
100
125
–50
–50 – 25
0
25
50
75
100
125
T
A
– Free-Air Temperature – °C
T
A
– Free-Air Temperature – °C
Figure 8
Figure 9
EQUIVALENT INPUT-NOISE VOLTAGE
vs
FREQUENCY
260
240
220
200
I
T
= 10 mA
= 25°C
O
A
180
160
140
120
100
10
100
1 k
10 k
100 k
f – Frequency – Hz
Figure 10
†
Data at high and low temperatures are applicable only within the recommended operating free-air temperature ranges of the various devices.
10
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
TYPICAL CHARACTERISTICS
EQUIVALENT INPUT-NOISE VOLTAGE
OVER A 10-SECOND PERIOD
6
5
4
3
2
1
0
– 1
– 2
– 3
– 4
– 5
– 6
f = 0.1 to 10 Hz
I
T
= 10 mA
= 25°C
KA
A
0
2
4
6
8
10
t – Time – s
19.1 V
1 kΩ
910 Ω
2000 µF
V
CC
V
CC
500 µF
TL1431
(DUT)
TLE2027
= 10 V/mV
820 Ω
1 µF
A
V
+
–
TLE2027
+
16 Ω
16 Ω
1 µF
–
16 Ω
2.2 µF
160 kΩ
33 kΩ
1 MΩ
CRO
A
V
= 2 V/V
0.1 µF
33 kΩ
V
EE
V
EE
TEST CIRCUIT FOR 0.1-Hz TO 10-Hz EQUIVALENT INPUT-NOISE VOLTAGE
Figure 11
11
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
TYPICAL CHARACTERISTICS
SMALL-SIGNAL VOLTAGE AMPLIFICATION
vs
FREQUENCY
60
I
T
= 10 mA
= 25°C
KA
A
Output
I
(K)
50
40
30
15 kΩ
230 Ω
9 µF
+
8.25 kΩ
–
20
GND
10
0
TEST CIRCUIT FOR VOLTAGE AMPLIFICATION
1 k
10 k
100 k
1 M
10 M
f – Frequency – Hz
Figure 12
REFERENCE IMPEDANCE
vs
FREQUENCY
100
I
T
= 1 mA to 100 mA
= 25°C
KA
A
1 kΩ
Output
I
(K)
10
50 Ω
–
+
1
GND
TEST CIRCUIT FOR REFERENCE IMPEDANCE
0.1
1 k
10 k
100 k
1 M
10 M
f – Frequency – Hz
Figure 13
12
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
TYPICAL CHARACTERISTICS
PULSE RESPONSE
6
5
4
3
2
1
0
T
A
= 25°C
V
220 Ω
I
Input
Output
Pulse
Generator
f = 100 kHz
50 Ω
Output
GND
TEST CIRCUIT FOR PULSE RESPONSE
0
1
2
3
4
5
6
7
t – Time – µs
Figure 14
150 Ω
†
STABILITY BOUNDARY CONDITIONS
I
KA
V
100
90
I
A-V
B-V
C-V
D-V
= V
I(ref)
+
–
KA
KA
KA
KA
I
T
= 10 mA
= 25°C
KA
A
= 5 V
C
L
V
BATT
= 10 V
= 15 V
80
70
Stable
60
50
B
Stable
C
TEST CIRCUIT FOR CURVE A
40
A
I
R1 =
10 kΩ
KA
30
20
10
0
150 Ω
D
C
L
V
I
+
–
V
BATT
0.001
0.01
0.1
1
10
R2
C
– Load Capacitance – µF
L
†
The areas under the curves represent conditions that may cause the
device to oscillate. For curves B, C, and D, R2 and V+ are adjusted to
establishtheinitialV andI conditionswithC =0. V
are then adjusted to determine the ranges of stability.
andC
L
KA KA BATT
L
TEST CIRCUIT FOR CURVES B, C, AND D
Figure 15
13
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
APPLICATION INFORMATION
Table of Application Circuits
APPLICATION
FIGURE
16
Shunt regulator
Single-supply comparator with temperature-compensated threshold
Precision high-current series regulator
Output control of a three-terminal fixed regulator
Higher-current shunt regulator
Crowbar
17
18
19
20
21
Precision 5-V, 1.5-A, 0.5% regulator
5-V precision regulator
22
23
PWM converter with 0.5% reference
Voltage monitor
24
25
Delay timer
26
Precision current limiter
27
Precision constant-current sink
28
R
V
(BATT)
V
V
O
(BATT)
R1
0.1%
V
O
V
TL1431
I(ref)
V
V
≈ 2 V
≈ V
on
off
(BATT)
R2
0.1%
Input
TL1431
V
IT
= 2.5 V
R1
R2
V
1
V
O
I(ref)
GND
NOTE A: R should provide cathode current ≥1 mA to the TL1431 at
minimum V
.
(BATT)
Figure 17. Single-Supply Comparator
Figure 16. Shunt Regulator
With Temperature-Compensated Threshold
14
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TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
APPLICATION INFORMATION
V
(BATT)
IN
V
(BATT)
OUT
V
O
µA7805
R
2N2222
30 Ω
Common
R1
R2
2N2222
TL1431
0.01 µF
4.7 kΩ
TL1431
V
O
R1
0.1%
R2
0.1%
R1
R2
R1
R2
V
1
V
V
1
V
I(ref)
+ 5 V
O
I(ref)
Min V = V
I(ref)
NOTE A: R should provide cathode current ≥1 mA to the TL1431 at
minimum V
(BATT).
Figure 19. Output Control of a
Figure 18. Precision High-Current Series Regulator
Three-Terminal Fixed Regulator
V
V
O
(BATT)
R
V
O
V
(BATT)
R1
TL1431
R1
R2
C
R2
TL1431
R1
R2
V
1
V
trip
I(ref)
NOTE A: Refer to the stability boundary conditions in Figure 15 to
determine allowable values for C.
R1
R2
V
1
V
O
I(ref)
Figure 20. Higher-Current Shunt Regulator
Figure 21. Crowbar
15
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
APPLICATION INFORMATION
V
(BATT)
V
O
= 5 V
R
b
In
Out
V
O
= 5 V, 1.5 A, 0.5%
27.4 kΩ
0.1%
V
(BATT)
LM317
8.2 kΩ
TL1431
243 Ω
Adjust
0.1%
TL1431
27.4 kΩ
0.1%
243 Ω
0.1%
NOTE A: R should provide cathode current ≥1 mA to the TL1431.
b
Figure 23. 5-V Precision Regulator
Figure 22. Precision 5-V, 1.5-A, 0.5% Regulator
12 V
6.8 kΩ
V
CC
10 kΩ
5 V +0.5%
–
10 kΩ
0.1%
TL1431
+
X
Not
TL598
Used
10 kΩ
0.1%
Feedback
Figure 24. PWM Converter With 0.5% Reference
16
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TL1431
PRECISION PROGRAMMABLE REFERENCE
SLVS062F – DECEMBER 1991 – REVISED JANUARY 2000
APPLICATION INFORMATION
R3
V
(BATT)
680 Ω
2 kΩ
R1B
R4
12 V
R1A
R
TL1431
TL1431
TL1431
R2A
R2B
On
C
Off
R1B
V
Low Limit
High Limit
1
1
I(ref)
R2B
LED on When
Low Limit < V < High Limit
(BATT)
R1A
R2A
V
I(ref)
12 V
Delay
R
C
I
NOTE A: Select R3 and R4 to provide the desired LED intensity and
I
(
)
12 V
V
I(ref)
cathode current ≥1 mA to the TL1431.
Figure 25. Voltage Monitor
Figure 26. Delay Timer
R
0.1%
CL
I
O
V
(BATT)
V
(BATT)
I
O
R1
TL1431
TL1431
V
R
0.1%
S
I(ref)
I
I
O
KA
R
CL
V
(BATT)
R1
I
V
O
I(ref)
I
I
KA
h
O
R
FE
S
Figure 28. Precision Constant-Current Sink
Figure 27. Precision Current Limiter
17
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