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Datasheet: AV431LT1 (Avic Technology)

Adjustable Reference Source

 

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Avic Technology
@vic
AV431
LT1
Copyright Avic Electronics Corp.
1
Website:
http://www.avictek.com
Adjustable Reference Source

FEATURES
The output voltage can be adjusted to 36V
Low dynamic output impedance ,its typical value is 0.2
Trapping current capability is 1 to 100mA
The typical value of the equivalent temperature factor in the
whole temperature scope is 50 ppm/
The effective temperature compensation in the working
range of full temperature
Low output noise voltage
Fast on -state response
0.5% and 1% precision



ABSOLUTE MAXIMUM RATINGS Operating
temperature range applies unless otherwise specified
Parameter
SYMBOL
VALUE
UNITS
Cathode Voltage
V
KA
37
V
Cathode Current Range (Continuous)
I
KA
-100-+150
mA
Reference lnput Current Range
Iref
0.05-+10
mA
Power Dissipation
P
D
770
mW
Operating temperature
Topr
0-70
Storage temperature Range
Tstg
-65-+150
ELECTRICAL CHARACTERISTICSTamb=25 unless otherwise specified
Parameter
Symbol
Test conditions
MIN
TYP
MAX
UNIT
Reference lnput Voltage
V
ref
V
KA
=V
REF
, I
KA
=10mA
2.440
2.495
2.550
V
Deviation of reference input Voltage
Over temperature (note)
V
ref
/T
V
KA
=V
REF
, I
KA
=10mA
Tmin Ta Tmax
4.5
17
mV
V
KA
=10V
V
REF
-1.0
-2.7
m
V/V
Ratio Of Change in Reference lnput
Voltage to the change in Cathode
Voltage
V
ref
/V
KA
I
KA
=10m
A
V
KA
=36V
10V
-0.5
-2.0
Reference lnput Current
l
ref
I
KA
= 10mA,R
1
=10K
R
2
=
1.5 4
A
Deviation Of Reference lnput Current
Over Full Temperature Range
l
ref
/T
l
KA
=10mA, R
1
=10K
R
2
=
T
A
=full Temperature
0.4
1.2
A
Minimum cathode current for
Regulation
I
KA
(min) V
KA
=V
REF
0.45
1.0
mA
Off-state cathode Current
I
KA
(OFF) V
KA
=36V ,V
REF
=0
0.05
1.0
A
Dynamic impedance
Z
KA
V
KA
=V
REF
,l
KA
=1 to 100mA
f 1.0KHz
0.15
0.5
Note:T
MIN
=0 ,T
MAX
=+70
@vic
AV431
LT1
Copyright Avic Electronics Corp.
2
Website:
http://www.avictek.com

TYPICAL APPLICATIONS















Vr
ef

R
EF
ERENCE I
N
P
U
T
VOLTAGE
(
m
V)
C TEMPERATURE (C)
2600
2580
2560
2540
2520
2500
2480
2460
2440
2400
2420
-50
-25
0
25
50
75
100 125
Vref = 2550mV
Figure 1.Reference Input Voltage vs. Temperature
Vref = 2495mV
Vref = 2440mV
V
KA
= Vref
I
K
= 10mA
Ire
fR
E
FE
R
E
N
C
E
IN
PU
T
CURRENT
(

A)
Figure 2.Reference Input Current vs. Temperature
C TEMPERATURE (C)
3.0
2.5
2.0
1.5
1.0
0.5
0
-75 -50
-25
0
25
50
70
100 125
R1 = 10k
R2 =
K = 10mA
I
K

C
ATHODE CURRENT
(
A)
d
(
Vr
ef
)
/
d
(
Vk
a)
(
m
V/V)
CATHODE CURRENT
(
m
A)
I
o
f
f

OF
F
-
S
T
ATE CATHODE
CURRENT

(
nA
)
V
KA
-CATHODE VOLTAGE (V)
C TEMPERATURE (C)
CATHODE VOLTAGE (V)
C TEMPERATURE (C)
Figure 6.Ratio of Delta Reference Voltage to
Delta Cathode Voltage over Temperature
Figure 5.Cathode Current vs. Cathode Voltage
Figure 4.Off-State Cathode Current vs. Temperature
Figure 3.Cathode Current vs. Cathode Voltage
150
125
100
75
50
25
0
-25
-50
-75
-100
-2
-1
0
1
2
3
90
80
70
60
50
40
30
20
10
0
-75
-50
-25
0
25
50
75
100 125
0
800
V
KA
= Vref
Tamb = 25C
V
KA
= 36V
Vref = 0V
600
400
200
0
-200
-1
0
1
2
3
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
-0.8
-0.9
-1
-75 -50
-25
0
25
50
75 100 125
V
KA
= Vref
Tamb =
V
KA
= 3V TO 36V
@vic
AV431
LT1
Copyright Avic Electronics Corp.
3
Website:
http://www.avictek.com













t TIME S
Figure 7. Pulse Response
PULSE
GENERATOR
F=100KHz
Figure 9.Small-Signal Voltage Amplification vs. Frequency
FREQUENCY IN Hz
Figure 8.Reference Impedance vs. Frequency
f FREQUENCY Hz
I
N
P
U
T AND OUTP
U
T VOLTAGE -
V
7
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
220
GND
OUTPUT
50
Test Circuit
100
10
1
0.1
1K
10K
100K
1M
10M
I
K
=10mA
Tamb=25C
Test Circuit for Reference Impedance
Av
VOLTAGE AMP
L
I
F
I
C
ATI
ON
d
B
|Z
KA
|
REF
E
RENCE I
M
P
E
DANCE
OUTPUT
GND
50
1K
10M
1M
100K
10K
1K
70
60
50
40
30
20
10
0
I
K
=10mA
Tamb=25C
OUTPUT
GND
15K
230
8.25K
9F
I
K
I
K
Test Circuit for Voltage Amplification
@vic
AV431
LT1
Copyright Avic Electronics Corp.
4
Website:
http://www.avictek.com

TYPICAL APPLICATIONS







Figure 10.Shunt Regulator
Figure 11.Series Pass Regulator
Figure 12.Single-Supply Comparator with
Temperature-Compensated Threshold
Figure 13.Constant Current Source
Figure 14.High Current Shunt
Figure 15.Constant Current Sink
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