ACE ACE432N Precision adjustable shunt voltage reference Datasheet

ACE432N
Precision adjustable shunt voltage reference
Description
The ACE432N is low-voltage three-terminal adjustable voltage references, with specified thermal
stability over applicable industrial and commercial temperature ranges. Output voltage can be set to any
value between VREF (1.24V) and 20V with two external resistors. These devices have a typical output
impedance of 0.25Ω. Active output circuitry provides a very sharp turn-on characteristic, making the
ACE432N excellent replacements for low-voltage Zener diodes in many applications, including onboard
regulation and adjustable power supplies.
Features




Low-Voltage Operation --- Down to 1.24V
Adjustable Output Voltage, Vo=Vref to 20V
Low Operational Cathode Current --- 80uA (Typ)
0.25Ω Typical Output Impedance
Application







Battery Power Equipment
Linear Regulators
Switch Power Supply
Cellular Phone
Digital Cameras
Computer Disk Drivers
Instrumentation
Absolute Maximum Ratings
Parameter
Symbol
Max
Unit
Cathode Voltage
VZ
20
V
Continuous Cathode Current
IZ
100
mA
Reference Current
Thermal resistance junction to ambient
SOT-23-5L
SOT-23-3
Operating junction temperature
IREF
3
mA
Storage temperature range
TSTG
θJA
TJ
O
206
C/W
206
-40 to 150 OC
-65 to 150
O
C
The IC has a protection circuit against static electricity. Do not apply high static electricity or high voltage that exceeds the
performance of the protection circuit to the IC.
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ACE432N
Precision adjustable shunt voltage reference
Packaging Type
SOT-23-5L
5
SOT-23-3
4
1
2
3
3
SOT-23-5L SOT-23-3 Description
1
3
2
Cathode
5
3
Anode
4
1
Ref
1.2
2
NC
Ordering information
ACE432N X XX + H
Halogen - free
Pb - free
BN : SOT-23-5L
BM : SOT-23-3
Reference Voltage accuracy :
A : 0.5%
B : 1%
Typical Application Circuit
VIN
R
VOUT
R1
VREF
R2
GND
1
2
3
GND
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ACE432N
Precision adjustable shunt voltage reference
Block Diagram
Electrical Characteristics
Parameter
Reference
Voltage
Symbol
Test Conditions
TA=25℃
0.5%
VREF
1.0%
VZ=VREF,
IZ=10mA
TA=-40℃~80℃
TA=25℃
TA=-40℃~80℃
Min.
Typ.
Max.
Unit
1.234 1.24 1.246
1.222
1.258
V
1.228 1.24 1.252
1.215
1.265
VREF Temp Deviation
VDEV
VZ=VREF, IZ=10mA
TA=-40℃~80℃
10
25
mV
Ratio of change in VREF to
change in cathode
voltage
ΔVREF/ΔVZ
IZ=10mA
ΔVZ=16V to VREF
-1.0
-2.7
mV/V
Reference Input current
IREF
0.15
0.5
μA
IREF Temp Deviation
IREF(DEV)
0.1
0.4
μA
Off-state cathode current
IZ(OFF)
0.5
1.0
μA
0.25
0.4
Ω
30
80
μA
Dynamic output
impedance
Minimum Operation
Current
RZ
IZ(MIN)
IZ =10mA,
R1=10KΩ, R2=∞
IZ=10mA, TA=-40℃~80℃
R1=10KΩ, R2=∞
VZ=6V
VREF=0
VZ=12V
IZ=1mA~100mA
VZ=VREF, f≦1KHz
VZ=VREF
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ACE432N
Precision adjustable shunt voltage reference
Application Circuit
Figure 1. Test Circuit for VKA=VREF
Figure 2. Test Circuit for VKA>VREF,
VO=VKA=VREF
VO=VKA=VREF*1(1+R1/R2)+IREF*R1
Figure 3. Test Circuit for IK(OFF)
Figure 4. Test Circuit for VKA>VREF,
VO=VKA=VREF*1(1+R1/R2)+IREF*R1
ACE432N
Figure 5. Flyback with isolation using ACE432N as voltage reference and error amplifier
* To improve the stability of output voltage, Figure 4, a 0.1uF capacitor is recommended between cathode to anode.
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ACE432N
Precision adjustable shunt voltage reference
Performance characteristics
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ACE432N
Precision adjustable shunt voltage reference
Performance Characteristics
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ACE432N
Precision adjustable shunt voltage reference
Performance Characteristics
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ACE432N
Precision adjustable shunt voltage reference
Performance Characteristics
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ACE432N
Precision adjustable shunt voltage reference
Packing Information
SOT-23-5L
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ACE432N
Precision adjustable shunt voltage reference
Packing Information
SOT-23-3
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ACE432N
Precision adjustable shunt voltage reference
Notes
ACE does not assume any responsibility for use as critical components in life support devices or systems
without the express written approval of the president and general counsel of ACE Electronics Co., LTD.
As sued herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and shoes failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be reasonably expected to result in
a significant injury to the user.
2. A critical component is any component of a life support device or system whose failure to perform can
be reasonably expected to cause the failure of the life support device or system, or to affect its safety
or effectiveness.
ACE Technology Co., LTD.
http://www.ace-ele.com/
VER 1.4
11
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