Advanced Power
Electronics Corp.
ADJUSTABLE PRECISION SHUNT
REGULATOR
Features
• Precision reference voltage
AP431A : 2.495V ± 0.5%
• Sink current capability: 200mA
• Minimum cathode current for regulation: 300μA
• Equivalent full-range temp coefficient: 30 ppm/
• Fast turn-on response
• Low dynamic output impedance: 0.2Ω
• Programmable output voltage to 36V
• Low output noise.
• Packages: TO-92,SOT-23, SOT-25 and SOP-8
o
SOT-89
• RoHS Compliant & Halogen Free Product
Ordering Information
A P 4 3 1 A X - X
Package Reference Voltage
T : TO-92
N/NR : SOT-23
Y : SOT-25
M : S
OP-8
G: SOT-89
Typical Application Circuit
V
IN
C
AP431A
Description
The AP431A are 3-terminal adjustable precision
shunt regulators with guaranteed temperature
stability over the applicable extended commercial
temperature range. The output voltage may be set at
any level greater than 2.495V(V
by selecting two external resistors that act as a
voltage divider network. These devices have a
typical output impedance of 0.2Ω. Active output
circuitry provides very sharp turn-on characteristics,
making these devices excellent improved
replacements for Zener diodes in many applications.
The precise (+/-) 1% Reference voltage tolerance of
the AP431A make it possible in many applications to
avoid the use of a variable resistor, consequently
saving cost and eliminating drift and reliability
problems associated with it.
Tolerance :
A : +/- 0.5%
B : +/- 1%
OUT
V
) up to 36V merely
REF
www.a-power.com.tw
++++
C
in
AP431A
AP431
V
OUT
= (1+R1/R2)V
Precision Regulator
R1
R2
REF
++++
C
out
1
20130401V6.2
Advanced Power
Electronics Corp.
Block Diagram
REF (R)
+
-
AP431A
Symbol
Cathode (C)
V
REF
Pin Configuration
Order Number
AP431AT
( TO-92 )
Rthja=160
Rthj
AP431AM
( SO
Rthja=
Rthjc=
o
C/W
l=60oC/W
-8 )
208oC/W
50oC/W
Pin Configuration ( Top View )
Cathode
Anode
Anode
NC
Anode (A)
1
2
3
4
3 Cathode
2 Anode
1 REF
8
7
6
5
REF
Anode
Anode
NC
Cathode (C)
Order Number
Rthja=
Rthjc=180
( SOT-23-5L
Rthja=500
Rthjc=180
AP431AN
( SOT-23
500oC/W
o
C/W
AP431AY
o
C/W
o
C/W
REF (R)
Anode (A)
Pin Configuration ( Top View )
Cathode
2
Anode
3
Cathode
)
1
REF
1
NC
2
NC
)
Cathode
3
Anode
5
REF
4
AP431AG
( SO
T-89 )
o
Rthja=250
Rthjc=110
C/W
o
C/W
AP431ANR
( SOT-23
Rthja=500
Rthjc=180
o
C/W
o
C/W
)
www.a-power.com.tw
Anode
Cathode
3
2
3
1
2
2
1
Anode
REF
REF
Cathode
AP431AY5
( SOT-23-5L
o
Rthja=500
Rthjc=180
C/W
o
C/W
)
Cathode
REF
Anode
1
2
3
5
NC
4
NC
2
Advanced Power
Electronics Corp.
AP431A
Absolute Maximum Ratings
Cathode Voltage ………………………………......….........................…...……………………………...……….36V
Continuous Cathode Current ………………………….…….............…................…………….... -10mA ~ 250mA
Reference Input Current Range ……………..………..............…….................................………….…....... 10mA
Operating Temperature Range ………….…………..…….…….....………………...........………......-40
Lead Temperature………………………….………….…….…………....…………………….........…............ 260
Storage Temperature ……………………………......…....….............………………..……...…....... -65
Power Dissipation (Notes 1. 2) TO-92 Package ….…………..………………………....………….....… 0.78W
SOT-23 Package .…...…………..…………….......…………………… 0.25W
SOT-25 Package……………………...…………….………….………..0.25W
o
Note 1: TJ, max =150
C
Note 2: Ratings apply to ambient temperature at 25
SOP-8 Package……………….………………………………………… 0.6W
SOP-89 Package............................................................................... 0.5W
o
C
Electrical Characteristics (Ta=25
o
C , unless otherwise specified.)
PARAMETER TEST CONDITIONS SYMBOL MIN. TYP. MAX. UNIT
V
= VREF,
Reference voltage
Deviation of Reference input voltage
over temperature (Note 3)
KA
= 10mA (Fig.1)
I
KA
VKA = V
, IKA = 10mA,
REF
Ta = Full range (Fig.1)
Ratio of the change in Reference
voltage to the change in Cathode
= 10mA (Fig.2)
I
KA
voltage
Reference input current
Deviation of Reference input current
over temperature
Minimum Cathode current for
regulation
R1 = 10KΩ,R2 = ∞ I
(Fig.2)
R1 = 10KΩ,R2 = ∞ IKA = 10mA
Ta = Full range (Fig.2)
= V
V
KA
REF
Off-state current VKA = 36V, V
V
= V
KA
Dynamic output impedance (Note 4)
Frequency
REF
(Fig.1) I
REF
≤ 1KHz (Fig.1)
-B 2.470 2.495 2.520
-A
VKA = 10V
~V
REF
VKA= 36V ~10V ∆V
= 10mA
KA
= 0V (Fig.3) I
V
REF
2.482 2.507
8.0 20 mV
V
REF
∆V
REF
KA
I
REF
αI
REF
KA(MIN)
KA(OFF)
Z
KA
-1.4 -2.0 mV/V
-1 -2 mV/V
1.4 3.5 µA
0.4 1.2 µA
0.19 0.5 mA
0.1 1.0 µA
0.2 0.5 Ω
o
C ~ 85oC
o
o
C ~ 150oC
V
C
www.a-power.com.tw
V
V
MAX
MIN
V
DEV
= V
MAX
- V
MIN
T
I
TEMPERATURE
T
2
3
Advanced Power
Electronics Corp.
AP431A
Note 3. Deviation of reference input voltage, V
, is defined as the maximum variation of the reference over
DEV
the full temperature range.
The average temperature coefficient of the reference input voltage αV
V
DEV
(
V
REF
REF
=α
C)(25V
°
TT
−
6
10)
⋅
……………………..……………….. (
12
is defined as:
REF
ppm
°
Where:
T2 – T1 = full temperature change.
αV
Note 4. The dynamic output impedance, R
can be positive or negative depending on whether the slope is positive or negative.
REF
, is defined as:
Z
V
∆
KA
Z
=
KA
I
∆
KA
When the device is programmed with two external resistors R1 and R2 (see Figure 2.), the dynamic output
impedance of the overall circuit, is defined as:
KA
= ≈
∆
KA
i
v
∆
'
Z
R1
(1Z
)
+
R2
Test Circuits
)
C
Input
REF
V
Fig1. Test Circuit for VKA= V
IN
V
KA
I
KA
R1
I
REF
REF
V
REF
(1+R1/R2)+I
REF
R2
Note:VKA=V
Fig2. Test circuit for VKA＞
I
KA
V
REF×
KA
R1
V
REF
Fig3. Test Circuit for off-state Current
IN
V
KA
I
Z(OFF)
www.a-power.com.tw
4
ge (V)
Advanced Power
Electronics Corp.
Typical Performance Characteristics
Cathode current Vs Cathode Voltage
100
VKA=Vref
o
C
Ta=25
0
Cathode current(mA)
600
400
200
Cathode current(uA)
AP431A
Cathode current (uA) Vs Cathode Voltage
VKA=Vref
o
C
Ta=25
0
-100
-1.5
-0.5
Cathode Voltage(v)
0.5
1.5 2.5
Reference Voltage Vs Free-Air Temperature
2500
2495
2490
2485
Reference Voltage(mV)
2480
-40 80-30 -20 -10 0 10 20 30 40 50 60 70
Free-Air Tempeture (oC)
Change in Reference Voltage vs Cathode Voltage
0
-2
IKA=10mA
-4
-6
Ta=25
o
C
-200
-0.5 0 0.5
-1
1
Cathode Voltage(v)
1.5 2 2.5
Reference input current Vs free Temperature
2
R1=10K
1.8
1.6
1.4
1.2
Reference input current (uA)
=10mA
I
KA
1
-50 -25 0 25 50 75 100 125
Free-Air Temperature(oC)
-8
-10
-12
Change in Reference Voltage (mv)
0 5 10 15 20 25 30
www.a-power.com.tw
Cathode Volta
5
A
Advanced Power
Electronics Corp.
Typical Performance Characteristics(Continued)
SMALL-SIGNAL VOLTAGE AMPLIFICATION vs. FREQUENCY
60
IKA=10mA
T
=25oC
50
A
15KΩ
AP431A
I
KA
232Ω
Output
40
30
20
10
-Small Signal Voltage Amplification (dB)
V
A
0
1K
10K
100K 1M 10M
f-Frequency-Hz
REFERENCE IMPEDANCE vs. FREQUENCY
100
IKA=10mA
=25oC
T
A
10
9µF
-
+
8.25KΩ
TEST CIRCUIT FOR VOLTAGE AMPLIFICATION
+
-
GND
1KΩ
50Ω
-
I
Output
KA
1
∣—Reference Impedance —Ω
∣ZK
0.1
1K 10K 100K 1M 10M
www.a-power.com.tw
f-Frequency-Hz
+
GND
TEST CIRCUIT FOR REFERENCE IMPEDANCE
6
A
A
Advanced Power
Electronics Corp.
AP431A
PULSE RESPONSE
6
TA=25oC
5
4
3
Input
Output
2
Input and Output Voltage-V
1
0
-101234567
t-Time-µ S
†
TA=25oC
Stable
100
90
80
70
STABILITY B OUNDARY CONDITIONS
VKA=V
ref
B VKA=5V
=10V
C V
KA
=15V
D V
KA
B
220Ω
Pulse
Generator
f=100kHz
TEST CIRCUIT FOR PULSE RESPONSE
50Ω
150Ω
I
KA
+
V
C
L
BATT
-
Output
GND
60
50
40
-Cathode Current-mA
30
KA
I
20
10
0
0.001 0.01 0.1 1 10
Stable
-Load Capacitance-µF
C
L
C
D
The areas under the curves represent conditions that may cause the
device to oscillate. For curves B, C, and D, R2 and V+ were adjusted
to establish the initial V
were then adjusted to determine the ranges of stability.
C
L
and IKA conditions with CL=0.V
KA
www.a-power.com.tw
BATT
and
TEST CIRCUIT FOR CURVE A
I
KA
R1=10KΩ
C
L
R2
TEST CIRCUIT FOR CURVE B, C, AND D
150Ω
+
V
BATT
-
7
Advanced Power
Electronics Corp.
Application Examples
V
IN
(1+R1B/R2B)
REF
V
(1+R1A/R2A)
REF
R1B
R2B
High Limit
＜
IN
R1A
R2A
LED on when Low Limit＜V
Low Limit
High Limit
≈
V
≈
V
IN
OFF
Delay =
R
ON
RC x ln(
AP431A
I
OUT
R
CL
V
IN
+
V
IN
V
)
-V
IN
REF
I
OUT
= V
REF
/ R
CL
Fig.4 Voltage Monitor
V
IN
I
OUT
= V
REF
/ R
I
OUT
R
S
Fig.7 Constant-Current Sink
S
V
Fig.5 Delay Timer
V
IN
R1
R2
V
OUT
= (1 + R1/R2) x V
Fig.8 Higher-Current Shunt Regulator
IN
R1A R1B
REF
+
Fig.6 Current Limiter or Current Source
V
V
OUT
IN
PUSE
R1
R2
IMIT
(1 + R1/R2) x V
L
REF
V
OUT
Fig.9 Crow Bar
Output ON when
Low Limint < V
IN
< High Limit
www.a-power.com.tw
BE
R2A R2B
Low Limit V
High Limit V
REF
(1 + R1B/R2B) +V
REF
(1 + R1A/R2A)
BE
V
Fig.10 Over-Voltage / Under-Voltage Protection Circuit
8
Advanced Power
A
A
A
A
A
S
Electronics Corp. AP431A
MARKING INFORMATION
SO-8
Part Number
Package Code
431AM
YWWSSS
SOT-23-5L
R6&XX
Date Code (YWWSSS)
Y：Last Digit Of The Year
WW：Week
SSS：Sequence
Part Number :
P431AY : R6
P431AY5 : R65
ID Code : Internal
SOT-23
SOT-89
R6&XX
431
YWW
Part Number :
P431AN : R6
P431ANR : R6R
ID Code : Internal
Part Number
Date Code (YWWS)
Y:Year
WW：Week
：
9
Advanced Power
Y
Electronics Corp. AP431A
MARKING INFORMATION
TO-92
Part Number
431A
WWS
Date Code (YWWS)
Y:Year
WW：Week
：
10
Loading...