LX6431AIDM [MICROSEMI]
PRECISION PROGRAMMABLE REFERENCES; 精密可编程参考
| 型号： | LX6431AIDM |
| 厂家： | 
Microsemi |
| 描述： | PRECISION PROGRAMMABLE REFERENCES |
| 文件： | 总11页 (文件大小：156K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
T H E I N F I N I T E P O W E R O F I N N O V A T I O N
P R O D U C T I O N D A T A S H E E T
D E S C R I P T I O N
K E Y F E A T U R E S
■ Unconditionally Stable For All Cathode To
The LX6431 series precision adjustable
three terminal shunt voltage regulators are
pin-to-pin compatible with the industry
standard TL431, but with significant
improvements. The LX6431 design has
eliminated regions of instability common
to older generation shunt regulator
products like the TL431. Designs are
made simpler by eliminating the task of
insuring capacitive loads, and output
voltage and cathode currents don't
combine for unstable operation. The
capacitor value is chosen simply to give
the best load transient response without
the possibility of instability. A lower
reference input current allows the use of
higher value reference divider resistors,
reducing the current drain from batteries
in portable equipment as well as reducing
the voltage programming errors due to
the impedance of the divider network
(See Product Highlight figure below). In
addition, the LX6431B has an improved
initial accuracy of 0.4%, and the output
voltage is programmable by using two
external resistors from 2.5V to 36V.
These devices offer low output
impedance for improved load regulation.
The typical output impedance of these
devices is 100mΩ. The reduced
reference input bias current and minimum
operating currents make these devices
suitable for portable and micropower
applications.
Anode Capacitance Values
■ Reduced Reference Input Current Allowing
The Use Of Higher Value Divider Resistors
(0.5µA Max.)
■ Initial Voltage Reference Accuracy Of 0.4%
(LX6431B)
■ Sink Current Capability 0.6mA to 100mA
■ Typical Output Dynamic Impedance Less
Than 100mΩ
■ Adjustable Output Voltage From 2.5V to
36V
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
P R O D U C T H I G H L I G H T
O U TP U T VO LTA G E ERRO R D U E TO IREF
TYP IC A L PRO G RA M M A BLE VO LTA G E
R EFEREN C E CIRC U IT
20
18
16
14
12
10
8
V
VKA
IN
R1
R2
LX6431
6
4
2
GND
0
2.5
3.75
5
6.25
7.5
8.75
10
11.25
12.5
13.75
15
(VKA) Output Voltage - (V)
P A C K A G E O R D E R I N F O R M A T I O N
Plastic SOIC
8-pin
Plastic TO-92
Initial
T (°C)
DM
LP
A
Tolerance
3-pin
LX6431CLP
2%
1%
LX6431CDM
LX6431ACDM
LX6431BCDM
LX6431IDM
0 to 70
LX6431ACLP
LX6431BCLP
LX6431ILP
0.4%
2%
-40 to 85
1%
0.4%
LX6431AIDM
LX6431BIDM
LX6431AILP
LX6431BILP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX5212CDPT)
TO-92 (LP) package also available in ammo-pack.
L I N F I N I T Y M I C R O E L E C T R O N I C S I N C .
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
Copyright © 1999
Rev. 1.4 6/ 99
1
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
A B S O LU TE M A X I M U M R ATI N G S
(Note 1 )
PACKAG E P IN O UTS
Cathode to Anode Voltage (VKA) ................................................................... -0.3V to 37V
Reference Input Current (IREF) .................................................................... -50µA to 10µA
Continuous Cathode Current (IK) ......................................................... -100mA to 150mA
Operating Junction Temperature
Plastic (DM & LP Packages) ................................................................................. 150°C
Storage Temperature Range ...................................................................... -65°C to 150°C
Lead Temperature ..................................................................................................... 300°C
1
2
3
4
8
7
6
5
REF
CATHODE
N.C.
ANODE
ANODE
N.C.
ANODE
N.C.
DM PACKAGE
(Top View)
Note 1. Exceeding these ratings could cause damage to the device. All voltages are with respect
to Ground. Currents are positive into, negative out of the specified terminal. Pin
numbers refer to DIL packages only.
1. CATHODE
2. ANODE
3. REF
TH ER M A L D ATA
DM PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
LP PACKAGE:
165°C/W
156°C/W
LP PACKAGE
(Top View)
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system.
All of the above assume no ambient airflow
B LO CK D I A G R A M
Cathode (K)
Ref (R)
VREF
Anode (A)
Copyright © 1999
Rev. 1.4 6/ 99
2
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
E L E C T R I C A L C H A R A C T E R I S T I C S (Note 2)
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX6431C/LX6431AC/LX6431BC with 0°C ≤ TA
70°C, LX6431I/LX6431AI/LX6431BI with -40°C ≤ TA ≤ 85°C.)
≤
LX6431
Min. Typ. Max.
Parameter
Symbol
Test Conditions
Units
Reference Input Voltage
LX6431
V
IK = 10mA, VKA = V , T = 25°C,
2440
2470
2490
2550
2520
2510
15
mV
mV
mV
mV
mV
mV
mV
mV
mV
REF
REF
A
LX6431A
LX6431B
LX6431
IK = 10mA, VKA = V , T = 25°C
REF A
IK = 10mA, VKA = V , T = 25°C
REF
A
Reference Drift
IK = 10mA, VKA = V , 0°C ≤ T ≤ 70°C
REF
A
IK = 10mA, VKA = V , -40°C ≤ T ≤ 85°C
25
REF
A
LX6431A
LX6431B
IK = 10mA, VKA = V , 0°C ≤ T ≤ 70°C
15
REF
A
IK = 10mA, VKA = V , -40°C ≤ T ≤ 85°C
25
REF
A
IK = 10mA, VKA = V , 0°C ≤ T ≤ 70°C
15
REF
A
IK = 10mA, VKA = V , -40°C ≤ T ≤ 85°C
20
REF
A
Voltage Ratio, Reference to Cathode
(Note 3)
IK = 10mA, VKA = 2.5V to 36V, T = 25°C
0.3
0.3
1
mV/V
mV/V
µA
A
IK = 10mA, VKA = 2.5V to 36V, T = Operating Range
1
A
Reference Input Current
IREF
IMIN
V
KA = V , T = 25°C
0.1 0.5
0.1 0.5
0.4 0.6
0.4 0.6
REF
A
V
KA = V , T = Operating Range
µA
REF
A
Minimum Operating Current
V
KA = VREF to 36V, T = 25°C
mA
mA
µA
A
V
KA = VREF to 36V, T = Operating Range
A
Off-State Cathode Current
Dynamic Impedance
IOFF
ZKA
V
KA = 36V, VREF = 0V, T = 25°C
0.3
1
A
V
KA = V , IK = 0.6mA to 100mA, f ≤ 1kHz, T = 25°C
30 100
mΩ
REF
A
Note 2. These parameters are guaranteed by design.
∆VREF
Note 3.
Ratio of change in reference input voltage
to the change in cathode voltage.
∆VKA
Copyright © 1999
Rev. 1.4 6/ 99
3
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
G RAP H / CURVE INDEX
FIG URE INDEX
Characteristic Curves
Application Information
FIGURE #
FIGURE #
1. REFERENCE VOLTAGE vs. FREE-AIR TEMPERATURE
2. REFERENCE CURRENT vs. FREE-AIR TEMPERATURE
3. CATHODE CURRENT vs. CATHODE VOLTAGE
7. COMPARISON OF REFERENCE RESISTOR VALUES BETWEEN AN
LX6431B AND A TL1431. Resistors used with the LX6431B are 5
times higher in value.
8. COMPARISON OF REFERENCE RESISTOR VALUES BETWEEN AN
LX6431B AND A TL1431. When used as 0.5%, 5V shunt
regulators.
4. OFF-STATE CATHODE CURRENT vs. FREE-AIR TEMPERATURE
5. RATIO OF DELTA REFERENCE VOLTAGE TO DELTA CATHODE
VOLTAGE vs. FREE-AIR TEMPERATURE
6. EQUIVALENT INPUT NOISE VOLTAGE vs. FREQUENCY
Parameter Measurement Information
FIGURE #
9. TEST CIRCUIT FOR VKA = V
REF
10. TEST CIRCUIT FOR VKA > V
REF
11. TEST CIRCUIT FOR IOFF
Typical Characteristics
FIGURE #
12. EQUIVALENT INPUT NOISE VOLTAGE OVER A 10-SECOND PERIOD
13. SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY
14. REFERENCE IMPEDANCE vs. FREQUENCY
15. PULSE RESPONSE
16. DIFFERENTIAL VOLTAGE AMPLIFICATION vs. FREQUENCY
Copyright © 1999
Rev. 1.4 6/ 99
4
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
C H A R A C T E R I S T I C C U R V E S
FIGURE 1. — REFERENCE VOLTAGE
FIGURE 2. — REFERENCE CURRENT
vs. FREE-AIR TEMPERATURE
vs. FREE-AIR TEMPERATURE
2.52
2.51
2.50
2.49
2.48
0.15
IK = 10mA
VREF = VKA
IK = 10mA
R1 = 10k
W
0.14
0.13
0.12
0.11
0.1
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
(TA) Ambient Temperature - (°C)
(TA) Ambient Temperature - (°C)
FIGURE 3. — CATHODE CURRENT vs. CATHODE VOLTAGE
FIGURE 4. — OFF-STATE CATHODE CURRENT
vs. FREE-AIR TEMPERATURE
800
0.8
VKA = VREF
VKA = 36V
0.7
T = 25°C
A
V
REF = 0
600
400
200
0
0.6
0.5
0.4
0.3
0.2
0.1
0
-200
-2
-1
0
1
2
3
4
-50
-25
0
25
50
75
100
125
(V ) Cathode Voltage - (V)
(TA) Ambient Temperature - (°C)
KA
Copyright © 1999
Rev. 1.4 6/ 99
5
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
C H A R A C T E R I S T I C C U R V E S
FIGURE 5. — RATIO OF DELTA REFERENCE VOLTAGE TO DELTA
FIGURE 6. — EQUIVALENT INPUT NOISE VOLTAGE
CATHODE VOLTAGE vs. FREE-AIR TEMPERATURE
vs. FREQUENCY
0
260
VKA = 3V to 36V
-0.1
IO = 10mA
240
T = 25°C
A
220
200
180
160
140
120
100
-0.2
-0.3
-0.4
-0.5
-0.6
-50
-25
0
25
50
75
100
125
10
100
1k
10k
100k
(TA) Ambient Temperature - (°C)
(f) Frequency - (Hz)
Copyright © 1999
Rev. 1.4 6/ 99
6
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
A P P L I C A T I O N I N F O R M A T I O N
Application Hints
VKA
5V, 0.5%
The reference input current of the LX6431 series voltage refer-
ences is much lower than other similar precision parts. This helps
to design programmable voltage references that can use much
higher value programming resistors while maintaining the same
accuracy as the other precision parts. Figure 7 below shows a 5V,
1% shunt regulator using the LX6431B and a shunt regulator using
the TL1431 (Also available from Linfinity). Figure 8 shows 0.5%
shunt regulators. Noteworthy are the values of the reference
resistors used in the two circuits. With the LX6431B it is possible
to use 25k resistors for setting the output voltage with 1%
precision as opposed to 5k programming resistors when the same
precision needs to be achieved with a TL1431.
V
IN
1k
0.1%
R1
R2
LX6431B
1k
0.1%
GND
a)
VKA
5V, 0.5%
V
IN
VKA
5V, 1%
V
240
0.1%
IN
R1
R2
25k
R1
TL1431
0.1%
240
0.1%
LX6431B
25k
R2
0.1%
GND
b)
GND
a)
FIGURE 8 — Comparison of reference resistor values between an
LX6431B and a TL1431, when used as 0.5%, 5V shunt regulators.
VKA
5V, 1%
V
IN
5k
R1
The output voltage of the reference can be programmed by using
the formula below:
0.1%
TL1431
R1
V
2.5
1 +
KA
5k
R2
R2
0.1%
If more accuracy is required then the effects of the input bias
current (IREF) must be taken into account. The formula below
accounts for the error this current produces.
GND
b)
R1
V
= 2.5
1 +
+ I
R1
FIGURE 7 — Comparison of reference resistor values between an
LX6431B and an TL1431, resistors used with the
LX6431B are 5 times higher in value.
KA
REF
R2
Smaller values of programming resistors tend to minimize bias
current errors. In this respect the low input current characteristics
of the LX6431B helps to reduce the power dissipation on the
programming resistors by a factor of five compared to other
references like the TL1431 and TL431.
The LX6431 series of voltage references have an enhanced
circuit design that can tolerate any value of cathode to anode
capacitance.
Copyright © 1999
Rev. 1.4 6/ 99
7
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
P A R A M E T E R M E A S U R E M E N T I N F O R M A T I O N
VKA
Input
VKA
Input
IK
IK
R
1
IREF
R
VREF
2
VREF
FIGURE 10 — TEST CIRCUIT FOR VKA > V
FIGURE 9 — TEST CIRCUIT FOR VKA = V
REF
REF
VKA
Input
IOFF
FIGURE 11 — TEST CIRCUIT FOR IOFF
Copyright © 1999
Rev. 1.4 6/ 99
8
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
T Y P I C A L C H A R A C T E R I S T I C S
6
f = 0.1 to 10Hz
IK = 10mA
5
4
T = 25°C
A
3
2
1
0
-1
-2
-3
-4
-5
-6
0
2
4
6
8
10
(t) Time - (s)
FIGURE 12. — EQUIVALENT INPUT NOISE VOLTAGE OVER A 10-SECOND PERIOD
19.1V
1k
VCC
910
500µF
2000µF
VCC
1µF
LX6431
(DUT)
TLE2027
AV = 10V/ mV
820
16
TLE2027
2.2µF
16k
16k
1µF
33k
33k
CRO
1M
AV = 2V/ V
0.1µF
VEE
VEE
Test Circuit for 0.1Hz to 10Hz Equivalent Input Noise Voltage
Copyright © 1999
Rev. 1.4 6/ 99
9
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
T Y P I C A L C H A R A C T E R I S T I C S
FIGURE 13. — SMALL-SIGNAL VOLTAGE AMPLIFICATION
vs. FREQUENCY
70
Output
IK = 10mA
T = 25°C
60
50
40
30
20
10
0
A
IK
230
15k
9µF
8.25k
GND
Test Circuit for Voltage Amplification
-10
10k
1M
10M
1k
100k
(f) Frequency - (Hz)
FIGURE 14. — REFERENCE IMPEDANCE vs. FREQUENCY
100
Output
IK = 1mA to 100mA
1k
T = 25°C
A
IK
10
50
1
GND
Test Circuit for Reference Impedance
0.1
1k
100k
1M
10M
10k
(f) Frequency - (Hz)
Copyright © 1999
Rev. 1.4 6/ 99
10
P RODUCT DATABOOK 1 9 9 6 / 1 9 9 7
LX6431/ LX6431A/ LX6431B
P
RECISION
P
ROGRAMMABLE
R
EFERENCES
P R O D U C T I O N D A T A S H E E T
T Y P I C A L C H A R A C T E R I S T I C S
FIGURE 15. — PULSE RESPONSE
6
5
Output
220
4
3
Pulse
Generator
f = 100kHz
50
2
1
0
3
2
GND
1
0
Test Circuit for Pulse Response
0
1
2
3
4
5
6
(t) Time - (µs)
FIGURE 16. — DIFFERENTIAL VOLTAGE AMPLIFICATION
vs. FREQUENCY
50
180
90
Phase Shift
GM/ 20
30
+35V
R3
1K
C2
To Network
10
0
0
Analyzer as DUT
Input Port with
10X Probe
To Network
Analyzer as
DUT Output Port
10µF
R1
100K
C1
-10
-90
-180
R2
R4
10µF
100K
2
-30
-50
DUT is bias at 30mA and 5V
Test Setup for Measuring AVD vs. Frequency
1k
10k
100k
1M
Frequency - (Hz)
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document
may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of
all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
Copyright © 1999
Rev. 1.4 6/ 99
11
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