APL1431
Adjustable Precision Shunt Regulator
Features
•Precise Reference Voltage to 2.500V
•Guaranteed 0.5% or 1% Reference Voltage Tolerance
•Sink Current Capability , 1mA to 100mA
•Quick Turn-on
•Adjustable Output Voltage , VO = VREF to 20V
•Low Operational Cathode Current , 250µA Typical
•0.1Ω Typical Output Impedance
•SOT-23 , SOT-89 and TO-92 Packages
Applications
•Linear Regulators
•Adjustable Power Supply
•Switching Power Supply
Symbol
REF
Anode Cathode
General Description
The APL1431 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 Vref (2.5 V) and 20 V with two external resistors (see Figure 2). When used
with an photocoupler, the APL1431 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 APL1431 excellent replacements for zener diodes in many applications, including on-board regulation and adjustable power supplies.
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ANODE |
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CATHODE |
REF |
SOT-23 (Top View)
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CATHODE ANODE REF
Functional Diagram
SOT-89 (Top View)
Cathode |
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REF |
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ANODE |
REF |
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CATHODE |
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Vref |
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TO-92 (Top View) |
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Anode |
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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. |
1 |
www.anpec.com.tw |
Rev. A.3 - May., 2003
APL1431
Ordering and Marking Information
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E le c . G rad e |
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A P L1431 |
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A : 0 .5 % R e fe ren ce V o lta ge T o le ran ce |
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B : 1 % R efe re nc e V oltag e T olera nc e |
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H an dling C o de |
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P ac ka ge C o de |
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A : S O T -23 |
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D : S O T -8 9 |
E : T O -9 2 |
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T em p . R a ng e |
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Y : C hip F orm |
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T em p . R a ng e |
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P ac ka ge C o de |
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C : 0 to 7 0 ° C |
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I : -4 0 to 85 ° C |
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E le c . G rad e |
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H an dling C o de |
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P B : P la stic B ag |
T B : T ap e & B o x |
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T R : T a p e & R e el |
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A P L |
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A P L1 43 1 A : |
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1 43 1 |
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A P L1 43 1 E : |
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1 43 1 |
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X X X X X - D a te C od e |
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X X X X X |
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A P L1 43 1 D : |
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A P L1 43 1 |
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X X X X X |
- D ate C o de |
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X X X X X |
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Absolute Maximum Ratings |
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Symbol |
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Parameter |
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Rating |
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Unit |
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VKA |
Cathode voltage |
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20 |
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V |
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IK |
Continuous cathode current range |
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120 |
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mA |
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IREF |
Reference current range |
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3 |
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mA |
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θJA |
Thermal Resistance from Junction to Ambient in Free Air |
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C/W |
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° |
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SOT-23 |
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416 |
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SOT-89 |
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250 |
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TO-92 |
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250 |
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TA |
Ambient temperature range |
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APL1431XXC |
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0 to 70 |
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C |
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° |
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APL1431XXI |
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-40 to 85 |
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Tj |
Junction temperature range |
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APL1431XXC |
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0 to 150 |
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C |
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° |
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APL1431XXI |
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-40 to 150 |
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TSTG |
Storage Temperature Range |
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-65 to 150 |
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C |
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° |
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TSOL |
Lead temperature range, Ts (Soldering, 10sec) |
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260 |
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C |
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° |
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Electrical Characteristics TA= 25°C ( unless otherwise noted) |
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Symbol |
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Parameter |
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Test Conditions |
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APL1431 |
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Unit |
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Min. |
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Typ. |
Max. |
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VREF |
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Reference voltage |
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VKA=VREF, |
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APL431A |
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2.487 |
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2.500 |
2.513 |
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V |
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IK=10mA*1 |
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APL431B |
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2.475 |
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2.500 |
2.525 |
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Reference voltage |
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VKA=VREF, IK=10mA |
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∆VREF/T |
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TA= 0 to 70°C*1 |
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20 |
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mV |
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drift over temp. range |
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TA= -40 to 85°C*1 |
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30 |
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∆VREF / ∆VKA |
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Voltage ratio (open |
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IK=10mA, VKA=VREF to 10V*2 |
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-1.5 |
-3 |
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mV/V |
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loop gain) |
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*2 |
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-1.2 |
-2.5 |
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IK=10mA, VKA=VREF to 20V |
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Copyright ANPEC Electronics Corp. |
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2 |
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www.anpec.com.tw |
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Rev. A.3 - May., 2003 |
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APL1431
Electrical Characteristics Cont. TA= 25°C ( unless otherwise noted)
Symbol |
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Test Conditions |
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APL1431 |
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Unit |
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Min. |
Typ. |
Max. |
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IREF |
Reference current |
IK=10mA, |
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1.0 |
3 |
µA |
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R1=10kΩ, R2=open |
*2 |
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∆IREF/T |
Reference current |
IK=10mA, R1=10kΩ, |
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0.3 |
1 |
µA |
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drift |
R2=open, TA= -40 to 85°C |
*2 |
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IK(min) |
Min. cathode current |
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*1 |
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0.25 |
0.5 |
mA |
VKA=VREF |
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IK(off) |
Off-state cathode |
VKA= 20V, VREF= 0V*3 |
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0.1 |
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µA |
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current |
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|ZKA| |
Dynamic impedance |
VKA=VREF |
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0.1 |
0.4 |
Ω |
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IK=1mA to 100mA, f ≤1kHz*1 |
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I |
Cathode current |
V |
=V + 50mV*2 |
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100 |
mA |
K |
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KA |
REF |
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Notes : *1 : use Figure 1 *2 : use Figure 2 *3 : use Figure 3
Test figures
VIN |
Vo |
VIN |
Vo |
IK |
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IK(off) |
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VREF |
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Figure 1. Test Circuit for VKA=VREF , |
VO=VKA=VREF |
Figure 3. Test Circuit for IK(off) |
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VIN |
Vo |
IK
R1 IREF
R2 VREF
Figure 2. Test Circuit for VKA>VREF,
VO= VKA= VREF× (1+R1/R2) + IREF × R1
Application schematic
5-Volt Precision Regulator
VIN |
Vo |
Rb |
27.5kΩ |
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0.1% |
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27.5kΩ |
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0.1% |
Rb should provide cathode current large than 1mA to maintain APL431 work properly.
Copyright ANPEC Electronics Corp. |
3 |
www.anpec.com.tw |
Rev. A.3 - May., 2003 |
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APL1431
Typical Characteristics
Reference Current vs.Temperature
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125 |
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- A |
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Current |
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Reference |
75 |
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50-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
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Temperature - °C |
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Cathode Current vs. Cathode Voltage
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100 |
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Current -mA |
50 |
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0 |
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Cathode |
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-50 |
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-100 |
0 |
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2 |
3 |
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-1 |
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Cathode Voltage -V |
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Cathode Current vs. Cathode Voltage
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800 |
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600 |
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- A |
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Current |
400 |
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IK-MIN |
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Cathode |
200 |
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0 |
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-200 |
0 |
1 |
2 |
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-1 |
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Cathode Voltage (V) |
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Reference Voltage vs. Temperature
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2.52 |
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2.515 |
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2.51 |
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-V |
2.505 |
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Voltage |
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2.5 |
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2.495 |
|
|
|
|
|
|
|
|
Reference |
|
|
|
|
|
|
|
|
2.49 |
|
|
|
|
|
|
|
|
2.485 |
|
|
|
|
|
|
|
|
|
2.48 |
|
|
|
|
|
|
|
|
2.475 |
|
|
|
|
|
|
|
|
2.47 |
|
|
|
|
|
|
|
|
-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
|
|
|
|
Temperature ( °C) |
|
|
Copyright ANPEC Electronics Corp. |
4 |
www.anpec.com.tw |
Rev. A.3 - May., 2003 |
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|