ETC WSL431-XPN2

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, 150µA
Typical
0.1Ω Typical Output Impedance
SOT-89 , TO-92 and SOT-23 Packages
This device has a typical output impedance of
o.1Ω. 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
General Description
CATHODE
SOT-89 (Top View)
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.
TO-92
SOT-23 (Top View)
Winson reserves the right to make changes to improve reliability or manufacturability.
©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
Elec. Grade
Package Code
A: TO-92
C: SOT-23
N: SOT-89
Package Code
Symbol
REF
ANODE
CATHODE
Functional Diagram
Winson reserves the right to make changes to improve reliability or manufacturability.
©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)
Electrical Characteristics
Symbol
Rating
26
150
3
0 to 85
0 to 125
-65 to 150
260
TA = 25˚C (unless otherwise noted)
Parameter
Test Conditions
Vref
VKA=Vref, IK=10mA.
∆Vref/T
Iref
Reference Voltage Drift over
Temp. range
Voltage Ration
(open loop gain)
Reference Current
∆Iref/T
Reference Current Drift
IK(min)
IK(off)
Min. Cathode Current
Off-state Cathode Current
Dynamic Impedance
zKA
Notes:
WSL431B
WSL431C
WSL431D
TA=0 to 85°C*1 , I k =10mA.
2.4925
2.480
2.455
IK=10 mA, VKA=Vref to 20V*2
-4
IK=10mA,
R1=10KΩ, R2=open*2
IK=10 mA,
R1=10KΩ, R2=open, TA=0 to
85°C*2
VKA=Vref*1
VKA=20V, Vref=0V*3
VKA=Vref, IK=1 mA to 100mA,
f=1k Hz*1
-0.4
: use Figure 1
*2: use Figure 2
*3: use Figure 3
*1
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. C)
Unit
WSL431
Min.
∆Vref/∆VKA
Unit
V
mA
mA
˚C
˚C
˚C
˚C
Typ.
Max.
2.505 2.5175
2.505 2.530
2.505 2.555
4
20
- 1.6
mV
0.4
3.5
mV/
V
µA
0.4
1.2
µA
0.15
0.1
-0.1
0.4
1
mA
µA
Ω
WSL431
Test figures
Figure 1. Test Circuit for VKA=VREF
VO=VKA =VREF
Figure 2. Test Circuit for VKA<VREF,
VO=VKA=VREF×(1+R1/R2)+IREF×R1
Figure 3. Test Circuit for Ik(off)
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. C)
WSL431
TYPICAL CHARACTERISTICS
Vref. vs Free-Air Temperature
Iref vs Free-Air Temperature
0.6
2.525
2.52
0.5
2.515
0.4
2.518 V
2.499 V
2.480 V
2.5
2.495
Iref. (uA)
Vref. (V)
2.51
2.505
0.3
0.2
2.49
2.485
0.1
2.48
2.475
0
20
30
40
50
60
70
80
90
20
100 110 120
30
40
50
60
70
80
C
Ik(off) vs Free-Air Temperature
110
120
Ratio of Delta Vref to Delta Vk vs Temperature
1.4
0
10
1.2
20
30
40
50
60
70
-0.5
dVref/dVk (mv/v)
1
0.8
0.6
0.4
0.2
-1
-1.5
-2
-2.5
-3
0
0
20
40
60
80
100
120
140
-3.5
o
o
C
C
Cathode Current vs Cathode Voltage
800
700
IKA - uA
Ik(off) - (uA)
100
C
o
-0.2
90
o
600
VKA=Vref
500
TA=25°C
400
Imin
300
200
100
0
-100
-200
-1
-0.5
0
0.5
1
1.5
2
2.5
3
VKA - V
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. C)
80
90
100
110
120
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.
©Winson, Jan. 2000 (Rev. C)
WSL431
Figure 7.
Figure 8.
Figure 9.
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. C)