APL431L
Low Voltage Adjustable Precision Shunt Regulator
Features
•Precise Reference Voltage to 1.24V
•Guaranteed 0.5% or 1% Reference Voltage Tolerance
•Sink Current Capability, 80uA to 100mA
•Quick Turn-on
•Adjustable Output Voltage, VO = VREF to 20V
•Low Operational Cathode Current, 80µA Typical
•0.1Ω Typical Output Impedance
•SOT-23-3, SOT-23-5, TO-92 and SOT-89 Packages
Applications
•Linear Regulators
•Adjustable Power Supply
•Switching Power Supply
Symbol
REF
Anode Cathode
General Description
The APL431L is a 3-terminal low voltage adjustable precision reference with specified thermal stability over applicable commercial temperature ranges. Out-
put voltage may be set to any value between Vref (1. 24 V) and 20 V with two external resistors (see Fig-
ure 2). When used with an photocoupler, the APL431L is an ideal voltage reference in isolated feedback circuits for 3V 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 APL431L 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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NC |
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NC |
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REF |
CATHODE |
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REF ANODE CATHODE |
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SOT-23-3 (Top View) |
SOT-23-5 (Top View) |
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3 |
CATHODE |
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2 |
ANODE |
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REF |
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REF |
ANODE CATHODE |
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TO-92 (Top View) |
SOT-89 (Top View) |
Functional Diagram
Cathode
REF |
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Vref |
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Anode |
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. B.7 - May., 2003
APL431L
Ordering and Marking Information
APL431L |
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Elec. Grade |
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A : 0.5% R eference Voltage Tolerance |
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B : 1% R eference Voltage Tolerance |
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H andling C ode |
Package C ode |
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Tem p. Range |
A : S O T-23-3 |
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B : S OT -23-5 |
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D : SO T-89 |
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E : TO -92 |
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Package C ode |
Y :C hip Form |
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Tem p. Range |
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Elec. Grade |
C : 0 to 70 ° C |
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I : -40 to 85 ° C |
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H andling C ode |
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P B : Plastic Bag |
TB : Tape & B ox |
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TR : Tape & Reel |
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AP L |
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431L |
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AP L431L A/B : |
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AP L431L E : |
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431L |
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XX XX X - Date Code |
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XX XX X |
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AP L431L D : |
AP L431L |
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XX XX X |
- D ate Code |
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XX XX X |
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Absolute Maximum Ratings
Symbol |
Parameter |
Rating |
Unit |
VKA |
Cathode voltage |
20 |
V |
IK |
Continuous cathode current range |
100 |
mA |
IREF |
Reference current range |
3 |
mA |
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-23-3 |
416 |
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SOT-23-5 |
357 |
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SOT-89 |
250 |
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TO-92 |
250 |
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T J |
Operating Junction Temperature Range |
-40 to 150 |
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C |
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TSTG |
Storage Temperature Range |
-65 to 150 |
C |
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TSOL |
Lead temperature range, Ts (Soldering, 10sec) |
260 |
C |
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° |
Copyright ANPEC Electronics Corp. |
2 |
www.anpec.com.tw |
Rev. B.7 - May., 2003 |
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APL431L
Electrical Characteristics TA= 25°C ( unless otherwise noted)
Symbol |
Parameter |
Test Conditions |
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APL431L |
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Unit |
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Min. |
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Typ. |
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Max. |
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VKA=VREF, IK=10mA |
APL431LA |
1.234 |
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1.240 |
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1.246 |
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VREF |
Reference voltage |
TA =25°C, (Fig. 1) |
APL431LB |
1.228 |
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1.240 |
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1.252 |
V |
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TA =full range(see |
APL431LA |
1.222 |
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1.240 |
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1.258 |
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Note1), (Fig.1) |
APL431LB |
1.215 |
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1.240 |
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1.265 |
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VDEF |
VDEF Temp Deviation |
TA =full range (see Note1) |
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5 |
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15 |
mV |
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VKA=VREF, IK=10mA (Fig. 1) |
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∆VREF / ∆VKA |
Ratio of Change in VREF |
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to Change in Cathods |
IK=10mA, VKA=16V to VREF (Fig. 2) |
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-0.2 |
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-1.0 |
mV/V |
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Votage |
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IREF |
Reference Input Current |
IK=10mA,R1 =10kΩ,R2 =∞ (Fig. 2) |
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0.15 |
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0.5 |
µA |
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TK=full range (see Note 1), |
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IREF(DEV) |
IREF Temp Deviation |
R1=10kΩ, R2=∞, IK=10mA, |
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0.05 |
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0.3 |
µA |
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(Fig. 2) |
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IK(off) |
off-state cathode current |
VREF=0V, (Fig. 3) |
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VK=6V |
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0.01 |
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0.1 |
µA |
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VK=16V |
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0.01 |
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0.5 |
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ZKA |
Dynamic Output |
VKA=VREF , IK=1mA to 100mA, |
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0.1 |
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0.4 |
Ω |
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Impedance |
f ≤1kHz (Fig. 1) |
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IK(MIN) |
Minimum Operating |
VKA=VREF (Fig. 1) |
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80 |
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100 |
µA |
Current |
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Notes : 1.Full temperature range is 0°C to 70°C for APL431LXXC,and -40°C to 85°C for APL431LXXl.
Copyright ANPEC Electronics Corp. |
3 |
www.anpec.com.tw |
Rev. B.7 - May., 2003 |
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APL431L
Test figures
VIN |
Vo |
IK
VREF
Figure 1. Test Circuit for VKA=VREF , VO=VKA=VREF
VIN |
Vo |
IK
R1 IREF
R2 VREF
Figure 2. Test Circuit for VKA>VREF,
VO= VKA= VREF× (1+R1/R2) + IREF × R1
VIN |
Vo |
IK(off)
Figure 3. Test Circuit for IK(off)
Copyright ANPEC Electronics Corp. |
4 |
www.anpec.com.tw |
Rev. B.7 - May., 2003 |
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APL431L
Application Schematic
Precision Voltage Reference
RB |
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VIN |
Vo |
R1 |
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VREF |
0.1 F |
R2 |
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Precision High-Current Series Regulator
VIN |
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Vo |
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RB |
R1 |
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VREF
0.1 F
R2
Notes for Application Circuits:
1)To improve the stability of output voltage, a 0.1 F capacitor between cathode and anode of APL431L is strongly recommended.
2)Set VOUT according to the following equation: VOUT = VREF(1+R1/R2)+lREF R1
3)Choose the value for RB as follows:
A)The maximum limit for RB should be such that the cathode current(lK) is greater than the minimum operating current (80 A) at VIN(MIN).
B)The minimum limit for RB should be such that the cathode current (lK) does not exceed 100mA under all load conditions, and the instantaneous turn-on value for lk does not exceed 150mA. Both of the following conditions must. be met:
RB,Min≥ |
VIN(MAX) |
(to limit instantaneous turn-on lK) |
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150mA |
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VIN(MAX)-VOUT |
(to limit lK |
under normal operating conditions) |
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RB,Min≥lOUT(MIN)+100mA |
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Copyright ANPEC Electronics Corp. |
5 |
www.anpec.com.tw |
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Rev. B.7 - May., 2003 |
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