Panasonic AN1431T Surface-mount adjustable output shunt regulator Datasheet

AN1431T, AN1431M
Surface-mount Adjustable Output Shunt Regulator
■ Overview
AN1431T
Unit : mm
The AN1431T and AN1431M are high accuracy stabilized
power supplies in which the output voltage can be adjusted in
the range from approx. 2.5 to 36V by using the external resistor
under the operating temperature. Because of its fast rise characteristics, it can be replaced with Zener diode and has the wide
application range.
4.0±0.2
13.5±0.5
5.1±0.2
5.0±0.2
■ Features
• High precision reference voltage : 2.5V±2%
• High-temperature stability : 17ppm/˚C typ.
• Output voltage externally adjustable : 2.5 to 36V
• Fast rise
• Low input impedance : 0.2Ω (typ.)
• Low output noise voltage
+0.2
0.45 – 0.1
2.54
2.3±0.2
2 3 1
JEDEC : TO-92 (SSIP003-P-0000)
■ Pin Name
AN1431M
〈AN1431T〉
4.0±0.2
Pin name
Cathode
2
Reference pin
3
Anode
13.5±0.5
1
5.1±0.2
Pin No.
Unit : mm
5.0±0.2
〈AN1431M〉
Pin No.
Pin name
1
Reference pin
2
Anode
3
Cathode
+0.2
0.45 – 0.1
2.54
2.3±0.2
2 3 1
JEDEC : TO-92 (SSIP003-P-0000)
■ Block Diagram
Current
Source
Output Tr
1
3
IK
+
Error
Amp.
–
Voltage
Reference
3
2
2
1
V1
VKA = VREF (1 +
R2 = 2.5kΩ
R1
R2
Pin number in
Pin number in
is for the AN1431T.
is for the AN1431M.
) + IREF · R1
IREF
VKA
R1
R2
VREF
■ Absolute Maximum Ratings (Ta=25˚C)
Symbol
Rating
Supply voltage
Parameter
VCC
37
Unit
Supply current
ICC
mW
mA
V
Power dissipation
PD
–100 to+150
650 *
Reference input current
IREF
– 0.05 to+10
Operating ambient
temperature
Storage temperature
AN1431T
–20 to+85
Vopr
AN1431M
AN1431T
˚C
–25 to+80
–55 to+150
Tstg
AN1431M
mA
˚C
–55 to+125
* For the AN1431M, SM to the printed board (glass epoxy of 20 × 20 × 1.7mm with copper film of 1cm2)
■ Recommended Operating Range (Ta=25˚C)
Parameter
Symbol
Range
VKA
VREF (2.5 to 36V)
Operating supply voltage range
■ Electrical Characteristics (Ta=25˚C)
Parameter
Reference voltage
Reference voltage temperature deviation
Reference voltage fluctuation
Reference input current
Reference input current temperature deviation
Symbol
Condition
VREF
VREF (Jev) *1 *2
VKA=VREF, IK=10mA
VKA=VREF, IK=10mA,
Ta=0 to+70˚C
min
typ
2.45
2.50
max
2.55
Unit
V
3
17
mV
–1.2
–2.7
mV/V
∆VREF
IK=10mA, DVKA=10V to VREF
∆VKA
IK=10mA, DVKA=36 to 10V
–1
–2
mV/V
IREF
IK=10mA, R1=10kΩ, R2= ∞
IK=10mA, R1=10kΩ, R2= ∞,
Ta=0 to+70˚C
2
4
µA
0.4
1.2
µA
IREF (Jev) *
2
Minimum cathode current
Imin
VKA=VREF
0.4
1.0
mA
Off-state cathode current
IOFF
VKA=36V, VREF=0V
VKA=VREF, IK=1 to 100mA,
f<
= 1kHz
0.1
1.0
µA
0.2
0.5
Ω
Dynamic impedance
|ZKA| *3
*1
VREF
The temperature coefficient aVREF for the reference input
voltage is equivalently given by the following expression.
VREF (dev) = VREF (max) –VREF (min)
VREF (max)
|aVREF|=
VREF (dev)
*
VREF at Ta=25˚C
For example, assuming the following ;
VREF (max) =2500mV (Ta=30˚C),
VREF (min) =2497mV (Ta=0˚C),
(VREF (dev) =3mV),
VREF=2499mV (Ta=25˚C)
∆Ta=70˚C
VREF (min)
∆Ta
IREF
VREF (dev)
VREF* × 106 (ppm/˚C)
∆Ta
IREF (dev) = IREF (max) – IREF (min)
Then, the following expression is established.
IREF (max)
IREF (dev)
3mV
|aVREF| = 2499mV × 106=17.1 (ppm/˚C)
70˚C
*2 These values are design reference values, not
guaranteed ones.
*3
IREF (min)
The dynamic impedance is defined by the following
expression.
|ZKA| =
∆Ta
∆VKA
∆IK
The total dynamic impedance at ∆VREF, ∆VKA,
IREF, and IREF (dev) is as follows.
∆V
R1
|Z| = ∆I = |ZKA| 1 + R
2
■ Power Dissipation
PD – Ta
1000
Mounting onto Substrate :
20 × 20 × 1.7mm Glass Epoxy
Substrate, Copper Foil 1cm2
or More
Power Dissipation PD (mW)
900
800
700
600
500
400
300
200
100
0
0
20
40
60
80 100 120 140 160
Ambient Temperature Ta (˚C)
■ Application Circuits
1.Shunt Regulator
2.Constant Current Power
Supply
+V
VO
3.Constant Current Source
+V
+V
IO
R1
VREF
AN1431T/M
AN1431T/M
R2
AN1431T/M
RS
RS
VO = 1+
R1
V
R2 REF
IO =
4.Current Boost
VREF
RS
IO =
5.Adjustable Output Regulator Combined
with 3-pin Regulator
+V
VO
+V
VO
AN7805
R1
R1
VREF
AN1431T/M
CI
AN1431T/M
CO
VREF
R2
R2
VO = 1+
R1
V
R2 REF
VO = VREF 1+
R1
= VREF + 5V
V
R2 O (min)
■ Characteristics Curve
VREF – Ta
IREF – Ta
4
Reference Voltage VREF (mV)
VK=VREF
IK=10mA
2650
2600
2550
2500
2450
2400
2350
–50 –25
0
25
50
75
100 125
Ambient Temperature Ta (˚C)
Reference Input Current IREF (µA)
2700
IK=10mA
R1=10kΩ
R2= ∞
3
2
1
–40 –20
0
20
40
60
80
100
Ambient Temperature Ta (˚C)
VREF
RS
IO
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