ETC WSL432

WSL432
Adjustable Precision Shunt Regulator
Features
•
•
•
•
•
•
•
•
Precise Reference Voltage to 1.240V
Guaranteed 1% and 1.5% Reference Voltage
Tolerance
Sink Current Capability, 0.1mA to 20mA
Quick Turn-on
Adjustable Output Voltage, Vo = Vref to 6V
Low Operational Cathode Current, 42µA
Typical
0.1Ω Typical Output Impedance
TO-92 and SOT-23 Package
This device has a typical output impedance of
0.1Ω. Active output circuitry provides a very
sharp turn-on characteristic, making the
WSL432 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
General Description
The WSL432 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 (1.24V) and 6V with two external resistors
(see Figure 2).
When used with a photo-coupler, the WSL432 is
TO-92
an ideal voltage reference in isolated feedback
circuits for 1.24V to 6V switching-mode power
supplies.
SOT-23 (Top View)
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. A)
WSL432
Ordering Information
Elect. Grade
WSL432-XP□ □
3: 1% Reference Voltage Tolerance
Elect. Grade
5: 1.5% Reference Voltage Tolerance
Package Code
Package Code
A: TO-92
C: SOT-23
Symbol
REF
ANODE
CATHODE
Functional Diagram
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. A)
WSL432
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
Vref
VKA=Vref, IK=10mA.
∆Vref/T
Iref
Reference Voltage Drift over
Temp. range
Voltage Ration
(open loop gain)
Reference Current
Iref(dev)
Iref deviation
∆Iref/T
Reference Current Drift
IK(min)
IK(off)
Min. Cathode Current
Off-state Cathode Current
Dynamic Impedance
zKA
Notes:
Test Conditions
WSL432
Unit
Min.
Typ.
Max.
1.228
1.222
1.24
1.24
4
1.252
1.258
20
V
V
mV
IK=10 mA, VKA=Vref to 6V*2
0.8
2.7
IK=10mA,
R1=10KΩ, R2=open*2
IK=10mA,
R1=10KΩ, R2=open*2
IK=10 mA,
R1=10KΩ, R2=open, TA=0 to
85°C*2
VKA=Vref*1
VKA=6V, Vref=0V*3
VKA=Vref, IK=0.1 mA to
20mA, f=1k Hz*1
0.15
0.5
mV/
V
µA
0.1
0.4
uA
0.4
1.2
µA
42
0.001
0.1
80
0.1
0.4
uA
µA
Ω
WSL432 (1%)
WSL432 (1.5%)
TA=0 to 85°C*1 , I k =10mA.
: 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. A)
Unit
V
mA
mA
˚C
˚C
˚C
˚C
TA = 25˚C (unless otherwise noted)
Parameter
∆Vref /∆VKA
Rating
7
30
3
0 to 85
0 to 125
-65 to 150
260
WSL432
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. A)
WSL432
TYPICAL CHARACTERISTICS
Vref. vs Free-Air Temperature
Iref. vs Free-Air Temperature
0.25
1.25
0.2
1.250V
1.241V
1.277V
1.24
1.23
Iref.(uA)
Vref.(V)
1.26
0.15
0.1
0.05
0
1.22
0
50
100
0
150
20
40
100
Ratio of Delta Vref to Delta Vk vs Temperature
Ik(off) vs. Free-Air Temperature
0.0015
dVref/dVk(mV/V)
0.15
Ik(off) - (uA)
80
℃
℃
0.1
0.05
0
-0.05
60
0
20
40
60
80
100
0.001
0.0005
0
120
0
20
40
60
℃
℃
Cathode Current vs Cathode Voltage
10
Ik(mA)
5
0
-1
-0.5
-5 0
0.5
1
1.5
-10
-15
Vka(V)
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. A)
80
100
120
120
WSL432
Application schematics
Figure 4.
Figure 5.
Figure 6.
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. A)
WSL432
Figure 7.
Figure 8.
Figure 9.
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. A)
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