WSL431 [WINSON]
Adjustable Precision Shunt Regulator; 可调式精密并联稳压器
| 型号： | WSL431 |
| 厂家： | 
WINSON SEMICONDUCTOR CORP. |
| 描述： | Adjustable Precision Shunt Regulator |
| 文件： | 总7页 (文件大小：219K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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
This device has a typical output impedance of
o.1ꢀ. 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.
•
•
0.1Ω Typical Output Impedance
SOT-89 , TO-92 and SOT-23 Packages
Applications
•
•
•
Linear Regulators
Adjustable Power Supply
Switching Power Supply
REF ANODE CATHODE
SOT-89 (Top View)
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.
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□N□
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
N: No-Lead Product
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
Parameter
Rating
26
150
Unit
VKA
Cathode voltage
V
mA
mA
˚C
˚C
˚C
I
Iref
K
Continuous cathode current range
Reference current range
3
T
T
A
Ambient temperature range
Junction temperature range
Storage Temperature Range
0 to 85
0 to 125
-65 to 150
260
J
TSTG
TSO
Lead temperature range, T
s
(Soldering,
˚C
10sec)
Electrical Characteristics
TA
= 25˚C (unless otherwise noted)
Symbol
Vref
Parameter
VKA=Vref, IK=10mA.
Test Conditions
WSL431
Unit
Min.
Typ.
Max.
WSL431B 2.4925 2.505 2.5175
WSL431C 2.480
WSL431D 2.455
2.505 2.530
2.505 2.555
Reference Voltage Drift over TA=0 to 85°C*1 , I k =10mA.
Temp. range
4
20
mV
ΔVref/T
ΔVref/ΔVKA
Iref
Voltage Ration
IK=10 mA, VKA=Vref to 20V*2
- 4
- 1.6
0.4
mV/
V
µA
(open loop gain)
Reference Current
IK=10mA,
3.5
1.2
R1=10KΩ, R2=open*2
Reference Current Drift
IK=10 mA,
0.4
µA
ΔIref/T
R1=10KΩ, R2=open, TA=0 to
85°C*2
Min. Cathode Current
Off-state Cathode Current
Dynamic Impedance
VKA=Vref*1
0.15
0.1
0.4
1
mA
µA
Ω
I
I
z
K(min)
K(off)
VKA=20V, Vref=0V*3
VKA=Vref, IK=1 mA to 100mA, -0.4
f=1k Hz*1
-0.1
KA
Notes: *1: use Figure 1
*2: use Figure 2
*3: use Figure 3
Winson reserves the right to make changes to improve reliability or manufacturability.
©Winson, Jan. 2000 (Rev. C)
WSL431
Test figures
Figure 1. Test Circuit for VKA=VREF
Figure 2. Test Circuit for VKA<VREF,
VO=VKA =VREF
VO
=VKA=VREF×(1+R
1
/R2
)+IREF×R
1
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
0.5
0.4
0.3
0.2
0.1
0
2.525
2.52
2.515
2.51
2.505
2.5
2.518 V
2.499 V
2.480 V
2.495
2.49
2.485
2.48
2.475
20
30
40
50
60
70
80
90
100 110 120
20 30 40 50 60 70 80 90 100 110 120
oC
oC
Ik(off) vs Free-Air Temperature
Ratio of Delta Vref to Delta Vk vs Temperature
1.4
1.2
1
0
-0.5
-1
10 20 30 40 50 60 70 80 90 100 110 120
0.8
0.6
0.4
0.2
0
-1.5
-2
-2.5
-3
0
20
40
60
80
100
120
140
-0.2
-3.5
oC
oC
Cathode Current vs Cathode Voltage
800
700
600
500
400
300
200
100
0
VKA=V
ref
T
=25°C
I
min
-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)
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)
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