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WSL431
Adjustable Precision Shunt Regulator
Features
* * * * * * * * Precise Reference Voltage to 2.505V Guaranteed 0.5%, 1% and 2% Reference Voltage Tolerance Sink Current Capability, 1mA to 100mA Quick Turn-on Adjustable Output Voltage, Vo = Vref to 20V Low Operational Cathode Current, 150A Typical 0.1 Typical Output Impedance SOT-89 , TO-92 and SOT-23 Packages This device has a typical output impedance of o.1. Active output circuitry provides a very sharp turn-on characteristic, making the WSL431 excellent replacements for zener diodes in many applications, including on-board Regulation and adjustable power supplies.
Applications
* Linear Regulators * Adjustable Power Supply * Switching Power Supply
REF ANODE CATHODE
General Description
The WSL431 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 (2.505V) and 20V with two external resistors (see Figure 2). When used with a photocoupler, the WSL431 is an ideal voltage reference in isolated feedback circuits for 2.505V to 12V switching-mode power supplies.
SOT-89 (Top View)
TO-92
SOT-23 (Top View)
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)
WSL431
Ordering Information
WSL431-XP Elec. Grad
2: 0.5% Reference Voltage Tolerance 3: 1% Reference Voltage Tolerance 4: 2% Reference Voltage Tolerance Package Code A: TO-92 C: SOT-23 N: SOT-89
Elec. Grade
Package Code
Symbol
REF ANODE CATHODE
Functional Diagram
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)
WSL431
Absolute Maximum Ratings Symbol VKA IK Iref TA TJ TSTG TSO Parameter Cathode voltage Continuous cathode current range Reference current range Ambient temperature range Junction temperature range Storage Temperature Range Lead temperature range, Ts (Soldering, 10sec) Rating 26 150 3 0 to 85 0 to 125 -65 to 150 260 Unit V mA mA C C C C
Electrical Characteristics
Symbol Parameter VKA=Vref, IK=10mA.
TA = 25C (unless otherwise noted)
Test Conditions
Min.
WSL431
Typ. Max.
Unit
Vref Vref/T Vref/VKA Iref Iref/T IK(min) IK(off)
Reference Voltage Drift over Temp. range Voltage Ration (open loop gain) Reference Current Reference Current Drift
WSL431B WSL431C WSL431D TA=0 to 85C*1 , I k =10mA. IK=10 mA, VKA=Vref to 20V*2 IK=10mA, R1=10K, R2=open*2 IK=10 mA, R1=10K, R2=open, TA=0 to 85C*2 VKA=Vref*1 VKA=20V, Vref=0V*3 VKA=Vref, IK=1 mA to 100mA, f=1k Hz*1
2.4925 2.480 2.455
2.505 2.5175 2.505 2.530 2.505 2.555 4 20 - 1.6 0.4 0.4 3.5 1.2
mV mV/ V A A
-4
zKA
Notes:
*1:
Min. Cathode Current Off-state Cathode Current Dynamic Impedance
-0.4
0.15 0.1 -0.1
0.4 1
mA A
use Figure 1 *2: use Figure 2 *3: use Figure 3
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)
WSL431
Test figures
Figure 1. Test Circuit for VKA=VREF VO=VKA =VREF
Figure 2. Test Circuit for VKAFigure 3. Test Circuit for Ik(off)
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)
WSL431
TYPICAL CHARACTERISTICS
Vref. vs Free-Air Temperature
2.525 2.52 2.515 2.51
0.6 0.5 0.4
2.518 V 2.499 V 2.480 V
Iref vs Free-Air Tem perature
Vref. (V)
2.505 2.5 2.495 2.49 2.485 2.48 2.475
Iref. (uA)
0.3 0.2 0.1 0
20
30
40
50
60
70
o
80
90
100 110 120
20
30
40
50
60
70
o
80
90
100
110
120
C
C
Ik(off) vs Free-Air Temperature
1.4 1.2 1 0.8 0.6 0.4 0.2 0 -0.2 0 20 40 60
o
Ratio of Delta Vref to Delta Vk vs Temperature 0
10 20 30 40 50 60 70 80 90 100 110 120
-0.5
dVref/dVk (mv/v)
80 C 100 120 140
Ik(off) - (uA)
-1 -1.5 -2 -2.5 -3 -3.5
o
Cathode Current vs Cathode Voltage
800 700 600 500
IKA - uA
C
VKA=Vref TA=25C
400 300 200 100 0 -100 -200 -1 -0.5 0 0.5 1
VKA - V
Imin
1.5
2
2.5
3
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)
WSL431
Application schematic
5-Volt Precision Regulator
*Rb should provide cathode current large than 0.4mA to maintain WSL431work properly. Figure 4.
Figure 5.
Figure 6.
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)
WSL431
Figure 7.
Figure 8.
Figure 9.
Winson reserves the right to make changes to improve reliability or manufacturability. (c)Winson, Jan. 2000 (Rev. C)

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