ANPEC APL431 Service Manual
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APL431
Adjustable Precision Shunt Regulator
Features General Description
••
•
Precise Reference Voltage to 2.500V
••
••
•
Guaranteed 0.5%, 1% or 2% Reference
••
Voltage Tolerance
••
•
Sink Current Capability, 1mA to 100mA
••
••
•
Quick Turn-on
••
••
•
Adjustable Output Voltage, VO = V
••
••
• Low Operational Cathode Current, 250µA
••
to 20V
ref
Typical
••
• 0.1Ω Typical Output Impedance
••
••
• SOT-23, SOT-23-5, SOT-89, SO-8, TO-92
••
and TO-92S Packages
Applications
••
• Linear Regulators
••
••
• Adjustable Power Supply
••
The APL431 is a 3-terminal adjustable voltage reference with specified thermal stability over applicable
commercial temperature ranges. Output voltage may
be set to any value between V
(2.5 V) and 20 V with
ref
two external resistors (see Figure 2). When used
with an photocoupler, the APL431 is an ideal voltage
reference in isolated feedback circuits for 2.5V to 12V
switching-mode power supplies. This device has a
typical output impedance of 0.1Ω. Active output circuitry provides a very sharp turn-on characteristic,
making the APL431 excellent replacements for zener diodes in many applications, including on-board
regulation and adjustable power supplies.
ANODE
3
12
REF
CATHODE
SOT-23 (Top View)
NC NC
45
123
REF ANODE
CATHODE
SOT-23-5 (Top View)
••
• Switching Power Supply
••
123
CATHODE
ANODE
ANODE
Symbol
REF
CathodeAnode
Functional Diagram
Cathode
REF
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise
customers to obtain the latest version of relevant information to verify before placing orders.
Copyright ANPEC Electronics Corp.
Rev. C.1 - Jun., 2003
+
_
ref
V
Anode
REF ANODE CATHODE
SOT-89 (Top View)
CATHODE
3
ANODE
2
1
REF
TO-92 (Top View)
1
8
REF
2
7
ANODE
3
6
ANODE
4
NC
NC
5
SO-8 (Top View)
CATHODE
3
ANODE
2
1
REF
TO-92S (Top View)
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APL431
Ordering and Marking Information
APL431
APL431 A/B :
APL431 D/K :
431
APL431
XXXXX
XXXXX
Lead Free Code
Handling Code
Temp. Range
Package Code
Elec. Grade
- Date Co de
Elec. Grade
A : 0.5% Reference Voltage Tolerance
B : 1 % R efe ren ce V oltage To leranc e
C : 2 % R eferen ce V oltage To leranc e
Package C ode
A : S O T-23 B : S O T-2 3-5 D : S O T -89
E : T O -92 I : TO-92S K : SO -8
Y : C hip F orm
Temp. Range
C : 0 to 70 C I : -40 to 85 C
Handling Code
PB : P lastic Bag T B : Ta pe & B o x
TR : Ta pe & Reel
Lead Free Code
L : Lead Free Device
Blank : Orginal Device
AP L4 3 1 E /I :
°
APL
431
XXXXX
°
XXXXX - Date Code
Absolute Maximum Ratings
Symbol Parameter Rating Unit
V
KA
I
K
I
REF
θ
JA
T
A
T
j
T
STG
T
SOL
Cathode voltage
Continuous cathode current range
Reference current range
Thermal Resistance from Junction to Ambient in Free Air
SOT-23
SOT-23-5
SOT-89
TO-92
SO-8
Ambient temperature range APL431XXC
APL431XXI
Junction temperature range APL431XXC
APL431XXI
Storage Temperature Range
Lead temperature range, Ts (Soldering, 10sec)
Original Device
Lead Free Device
20 V
100 mA
3mA
416
357
250
250
210
0 to 70
-40 to 85
0 to 150
-40 to 150
-65 to 150
260
300
°C/W
°C
°C
°C
°C
Copyright ANPEC Electronics Corp.
Rev. C.1 - Jun., 2003
www.anpec.com.tw2
APL431
Electrical Characteristics (Cont.) T
Symbol Parameter Test Conditions
APL431A 2.487 2.500 2.513
,
APL431B 2.475 2.500 2.525V
1
APL431C
=10mA
1
1
REF
REF
*1
= 0V
REF
+ 50mV
*2
REF
/ T
V
∆
REF
/ ∆V
V
∆
REF
I
REF
/T
I
∆
REF
I
K(min)
I
K(off)
Reference voltage
Reference voltage
drift over temp. range
Voltage ratio (open
KA
loop gain)
Reference current
Reference current
drift
Min. cathode current VKA=V
Off-state cathode
current
|ZKA| Dynamic impedance
I
K
Cathode current VKA=V
V
KA=VREF
I
=10mA*
K
V
KA=VREF,IK
T
=0 to 70°C*
A
TA =-40 to 85°C*
IK=10mA, VKA=V
=10mA, VKA=V
I
K
I
=10mA,
K
=10kΩ, R2=open
R
1
=10mA, R1=10kΩ,
I
K
=open, TA= -40 to 85°C
R
2
REF
V
= 20V, V
KA
V
KA=VREF
IK=1mA to 100mA, f ≤1kHz
REF
= 25°C ( unless otherwise noted)
A
APL431
Min. Typ. Max.
2.450 2.500 2.550
to 10V
to 20V
*2
*2
*2
-1.5 -3
-1.2 -2.5
1.0 3
*2
0.3 1
0.25 0.5 mA
*3
*1
0.1 1
0.1 0.4
Unit
V
20
mV
30
mV/V
µ
µ
µ
Ω
100 mA
A
A
A
Notes : *1 : use Figure 1
*2 : use Figure 2
*3 : use Figure 3
Copyright ANPEC Electronics Corp.
Rev. C.1 - Jun., 2003
www.anpec.com.tw3
APL431
Test figures
IN
V
REF
V
Figure 1. Test Circuit for VKA=V
V
IN
R1
R2
I
REF
REF
V
Figure 2. Test Circuit for VKA>V
VO= VKA= V
× (1+R1/R2) + I
REF
K
I
, VO=VKA=V
REF
I
K
,
REF
REF
V
o
× R
V
IN
I
K(off)
REF
V
o
1
Figure 3. Test Circuit for I
K(off)
V
o
Application schematic
5-Volt Precision Regulator
V
IN
b
R
∗ R
should provide cathode current large than
b
1mA to maintain APL431 work properly.
Copyright ANPEC Electronics Corp.
Rev. C.1 - Jun., 2003
27.5k
0.1%
27.5k
0.1%
o
V
Ω
Ω
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APL431
Typical Characteristics
Reference Input Current vs. Temperature
2
1.5
1
0.5
Reference Input Current (µA)
0
-40-200 20406080100
Temperature (°C)
Cathode Current vs. Cathode Voltage
800
600
400
200
0
Cathode Current (mA)
-200
-1 0 1 2 3
Cathode Voltage (V)
Cathode Current vs. Cathode Voltage
800
600
400
200
Cathode Current (µA)
0
-200
-1 0 1 2 3
IK-MIN
Cathode Voltage (V)
Reference Voltage vs. Temperature
2.52
2.515
2.51
2.505
2.5
2.495
2.49
2.485
2.48
Reference Voltage (V)
2.475
2.47
-40
-20
20 40 60 80 100
0
Temperature (°C)
Copyright ANPEC Electronics Corp.
Rev. C.1 - Jun., 2003
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