APL431
Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
•
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, V
O
= V
REF
to 20V
Low Operational Cathode Current, 250µA
Typical
0.1Ω Typical Output Impedance
SOT-23-3, SOT-23-5, SOT-89, SOP-8, and TO-92
Packages
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APL431 is a 3-terminal adjustable voltage reference
with specified thermal stability over applicable commer-
cial temperature ranges. Output voltage may be set to any
value between V
REF
(2.5 V) and 20 V with two external
resistors (See Figure 2). When used with an photocoupler,
the APL431 is an ideal voltage reference in isolated feed-
back 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.
Pin Configuration
Applications
NC
NC
•
•
•
Linear Regulators
3
ANODE
5
2
4
2
3
Adjustable Power Supply
Switching Power Supply
1
1
REF CATHODE
REF ANODE CATHODE
Symbol
REF
Anode
Cathode
SOT-23-3 (Top View)
SOT-23-5 (Top View)
CATHODE
ANODE
1
2
3
1
2
3
4
8
7
6
5
REF
ANODE
ANODE
NC
ANODE
NC
Functional Diagram
Cathode
REF
ANODE CATHODE
SOT-89 (Top View)
SOP-8 (Top View)
REF
+
_
3 CATHODE
2 ANODE
Vref
1 REF
Anode
TO-92 (Top View)
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.7 - Mar., 2009
1
www.anpec.com.tw
APL431
Ordering and Marking Information
APL431
Assembly Material
Handling Code
Temperature Range
Package Code
Elec. Grade
Elec. Grade
A : 0.5% Reference Voltage Tolerance
B : 1% Reference Voltage Tolerance
C : 2% Reference Voltage Tolerance
Package Code
A : SOT-23-3
B : SOT-23-5
D : SOT-89
E : TO-92
K : SOP-8
Y : Chip Form
Operating Ambient Temperature Range
C : 0 to 70
o
C I : -40 to 85
o
C
Handling Code
TB : Tape & Box TR : Tape & Reel
PB : Plastic & Box
Assembly Material
G : Halogen and Lead Free Device
APL431 A/B :
APL431 D :
APL431 E :
431
APL431
XXXXX
APL
431
XXXXX
APL431
XXXXX
XXXXX - Date Code
XXXXX - Date Code
APL431 K :
XXXXX - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Absolute Maximum Ratings
Symbol
V
KA
I
K
I
REF
T
A
Junction Temperature Range
T
J
T
STG
T
SOL
Storage Temperature Range
Cathode Voltage
Continuous Cathode Current Range
Reference Current Range
Ambient Temperature Range
(Note 1)
Rating
21
100
3
APL431XXC
APL431XXI
APL431XXC
APL431XXI
0 to 70
-40 to 85
0 to 150
-40 to 150
-65 to 150
260
Unit
V
mA
mA
°C
°C
°C
°C
Parameter
Maximum Lead Soldering Temperature, 10 Seconds
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Copyright
©
ANPEC Electronics Corp.
Rev. C.7 - Mar., 2009
2
www.anpec.com.tw
APL431
Thermal Characteristics
Symbol
Parameter
Thermal Resistance from Junction to Ambient in Free Air
θ
JA
(Note 2)
Typical Value
SOT-23
SOT-23-5
SOT-89
TO-92
SOP-8
416
357
250
250
210
Unit
°C/W
Note 2:
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air.
Electrical Characteristics
Symbol
Parameter
T
A
= 25°C ( unless otherwise noted)
Test Conditions
Min.
APL431A
2.487
2.475
2.450
-
-
-
-
-
-
-
-
-
APL431
Typ.
2.500
2.500
2.500
-
-1.5
-1.2
1.0
0.3
0.25
0.1
0.1
-
Max.
2.513
2.525
2.550
20
30
-3
-2.5
3
1
0.5
1
0.4
100
µA
µA
mA
µA
Ω
mA
mV
V
Unit
V
REF
Reference Voltage
V
KA
=V
REF
, I
K
=10mA
(Note 3)
V
KA
=V
REF
,I
K
=10mA
T
A
=0 to 70°C
(Note 3)
T
A
=-40 to 85°C
(Note 3)
APL431B
APL431C
∆V
REF
/ T
∆V
REF
/
∆V
KA
I
REF
∆I
REF
/T
I
K(min)
I
K(off)
|Z
KA
|
I
K
Reference Voltage Drift
Over Temperature Range
Voltage Ratio
(Open Loop Gain)
Reference Current
Reference Current Drift
Min. Cathode Current
Off-state Cathode Current
Dynamic Impedance
Cathode Current
I
K
=10mA, V
KA
=V
REF
to 10V
(Note 4)
I
K
=10mA, V
KA
=V
REF
to 20V
(Note 4)
I
K
=10mA, R
1
=10kΩ, R
2
=open
(Note 4)
I
K
=10mA, R
1
=10kΩ, R
2
=open,
T
A
= -40 to 85°C
(Note 4)
V
KA
=V
REF (Note 3)
V
KA
= 20V, V
REF
= 0V
(Note 5)
V
KA
=V
REF
I
K
=1mA to 100mA, f
≤1kHz
(Note 3)
mV/V
Note 3 : use Figure 1
Note 4 : use Figure 2
Note 5 : use Figure 3
Test Figures
V
IN
I
K
V
O
V
IN
I
K
R1
I
REF
V
O
V
IN
I
K(off)
V
O
V
REF
R2
V
REF
Figure 1. Test Circuit for
V
KA
=V
REF
, V
O
=V
KA
=V
REF
Figure 2. Test Circuit for
V
KA
>V
REF
, V
O
= V
KA
= V
REF
×
(1+R
1
/R
2
) + I
REF
×
R
1
Figure 3. Test Circuit for I
K(off)
Copyright
©
ANPEC Electronics Corp.
Rev. C.7 - Mar., 2009
3
www.anpec.com.tw
APL431
Typical Application Circuits
R
B
V
IN
R
1
V
o
V
IN
R
B
C
1
V
O
R
1
V
REF
R
2
V
REF
R
2
Precision Voltage Reference
Precision High-Current Series Regulator
Notes for Typical Application Circuits:
1) For the series regulator applications, add a compensation capacitor C1 between CATHODE and REF is
strongly recommended to improve the stability of output voltage .
2) Set V
O
according to the following equation: V
O
= V
REF
(1+R1/R2)+l
REF
xR1
3) Choose the value for R
B
as below:
A) The maximum limit for R
B
should be such that the cathode current (l
K
) is greater than the minimum
operating current (0.5mA) at V
IN(MIN)
.
B) The minimum limit for R
B
should be such that the cathode current (l
K
) does not exceed 100mA under all
load conditions, and the instantaneous turn-on value for l
K
does not exceed 120mA.
Copyright
©
ANPEC Electronics Corp.
Rev. C.7 - Mar., 2009
4
www.anpec.com.tw
APL431
Typical Operating Characteristics
Reference Input Current vs. Ambient
Temperature
1.5
R
1
=10kΩ
R
2
=
∞
I
K
=10mA
Cathode Current vs. Cathode Voltage
800
V
KA
=V
REF
T
A
=25
o
C
Reference Input Current (µA)
600
1.25
Cathode Current (µA)
400
I
K-MIN
200
1
0.75
0
0.5
-50
-25
0
25
50
75
100
125
-200
-1
0
1
2
3
Ambient Temperature (°C)
Cathode Voltage (V)
Cathode Current vs. Cathode Voltage
100
V
KA
=V
REF
T
A
=25
o
C
Reference Voltage vs. Ambient Temperature
2.52
2.515
2.51
Reference Voltage (V)
V
KA
=V
REF
I
K
=100mA
Cathode Current (mA)
50
2.505
2.5
2.495
2.49
2.485
2.48
2.475
0
-50
-100
2.47
-50
-1
0
1
2
3
-25
0
25
50
75
100
125
Cathode Voltage (V)
Ambient Temperature (°C)
Copyright
©
ANPEC Electronics Corp.
Rev. C.7 - Mar., 2009
5
www.anpec.com.tw
京公网安备 11010802033920号
EEWORLD
