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PDF AS431 Data sheet ( Hoja de datos )
| Número de pieza | AS431 | |
| Descripción | ADJUSTABLE PRECISION SHUNT REGULATORS | |
| Fabricantes | BCD | |
| Logotipo |  |
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Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
General Description
Features
AS431
The AS431 is a three-terminal adjustable shunt regula-
tor with guaranteed thermal stability over a full opera-
tion range. It features sharp turn-on characteristics, low
temperature coefficient and low output impedance,
which make it ideal substitute for Zener diode in appli-
cations such as switching power supply, charger and
other adjustable regulators.
The output voltage of AS431 can be set to any value
between VREF (2.5V) and the corresponding maximum
cathode voltage (36V).
The AS431 precision reference is offered in two volt-
age tolerance: 0.5% and 1.0%.
This IC is available in 4 packages: TO-92 (bulk or
ammo packing), SOT-23, SOT-23-5 and SOT-89.
g Programmable Precise Output Voltage from 2.5V
to 36V
g High Stability under Capacitive Load
g Low Temperature Deviation: 4.5mV Typical
g Low Equivalent Full-range Temperature Coeffi-
cient with 20PPM/oC Typical
g Sink Current Capacity from 1mA to 100mA
g Low Output Noise
g Wide Operating Range of -40 to 125oC
Applications
g Charger
g Voltage Adapter
g Switching Power Supply
g Graphic Card
g Precision Voltage Reference
SOT-89
TO-92(Bulk Packing)
TO-92(Ammo Packing)
Mar. 2009 Rev. 2. 0
SOT-23
SOT-23-5
Figure 1. Package Types of AS431
BCD Semiconductor Manufacturing Limited
1
1 page  
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
AS431
Electrical Characteristics
Operating Conditions: TA=25oC, unless otherwise specified.
Parameter
Reference Voltage
0.5%
1.0%
Test
Circuit
4
Deviation of Reference Voltage
Over Full Temperature Range
4
Ratio of Change in Reference
Voltage to the Change in
Cathode Voltage
Reference Current
Deviation of Reference Current
Over Full Temperature Range
Minimum Cathode Current for
Regulation
5
5
5
4
Symbol
Conditions
Min Typ Max Unit
VREF
'VREF
'VREF
'VKA
IREF
'IREF
IKA
(Min)
VKA=VREF, IKA=10mA
VKA=VREF
IKA= 10mA
0 to 70oC
-40 to 85oC
-40 to 125oC
IKA=10mA
'VKA=
10V to VREF
'VKA=
36V to 10V
IKA=10mA,R1=10K:, R2=f
2.487
2.475
2.500
2.500
4.5
4.5
4.5
-1.0
-0.5
0.7
2.512
2.525
8
10
16
-2.7
-2.0
4
IKA=10mA, R1=10K:
R2=f TA=-40 to 125oC
0.4 1.2
VKA=VREF
0.4 1.0
V
mV
mV/V
PA
PA
mA
Off-state Cathode Current
6
IKA
(Off)
VKA=36V, VREF=0
0.05 1.0 PA
Dynamic Impedance
Thermal Resistance
4
ZKA
VKA=VREF, IKA=1 to 100mA,
f d 1.0KHz
SOT-23
SOT-23-5
TJC
TO-92
SOT-89
0.15 0.5
135.9
135.9
81.9
84.9
:
oC/W
Mar. 2009 Rev. 2. 0
BCD Semiconductor Manufacturing Limited
5
5 Page 
Data Sheet
ADJUSTABLE PRECISION SHUNT REGULATORS
Typical Application
AS431
R3
VIN
R1
VREF
R2
VOUT
VOUT=(1+R1/R2)*VREF
AS431
Figure 17. Shunt Regulator
VIN
R1
R2
VREF
R3
R4
AS431
VOUT
VOUT=(1+R2/R3)*VREF
Figure 18. High Current Shunt Regulator
VIN
R1
R2
IOUT
IOUT=VREF/R2 + IKA
Mar. 2009 Rev. 2. 0
AS431
Figure 19. Current Source or Current Limit
BCD Semiconductor Manufacturing Limited
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet AS431.PDF ] | |
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