LM432AA3 [CYSTEKEC]
Adjustable shunt regulator; 可调并联稳压器
| 型号： | LM432AA3 |
| 厂家： | 
CYSTECH ELECTONICS CORP. |
| 描述： | Adjustable shunt regulator |
| 文件： | 总9页 (文件大小：225K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 1/9
CYStech Electronics Corp.
Adjustable shunt regulator
LM432XA3/N3
Description
Features
The LM432 is a three terminal adjustable shunt
regulator with thermal stability guaranteed over
temperature. The output voltage can be adjusted
to any value from 1.24V(VREF) to 20V with two
external resistors. The LM432 has a typical dynamic
output impedance of 0.05Ω. Active output circuitry
provides a very sharp turn on characteristic, making
◆Low voltage operation(down to 1.24V)
◆Wide operating current range 80μA to 100mA
◆Low dynamic output impedance 0.05Ω typ.
◆Trimmed bandgap design ±0.25%
◆Upgrade for LM431
◆Available in TO-92 and SOT-23 packages
the LM432 an excellent replacement for zener diodes. Applications
The LM432 shunt regulator is available with four
voltage tolerances(0.25%,0.5%,1% and 2%), and two
◆Linear Regulators
◆Adjustable Supplies
package options(TO-92 and SOT-23). This allows the ◆Switching Power Supplies
designer the opportunity to select the optimum combi- ◆Battery Operated Computers
nation of cost and performance for their application.
◆Instrumentation
◆Computer Disk Drives
Typical Application Circuit(Note 1,2)
Notes:
1) Set VOUT according to the following equation:
R
VIN
VOUT
VOUT=VREF(1+R1/R2)+IREFR1
2) Choose the value for R as follows:
˙The maximum limit for R should be such that the
cathode current, Iz, is greater than the minimum
operating current(80μA) at VIN(MIN).
˙The minimum limit for R should be as such that Iz
does not exceed 100mA under all load conditions,
and the instantaneous turn-on value for Iz does not
exceed 150mA. Both of the following conditions
must be met:
R1
VREF
LM432
R2
GND
Rmin≥VIN(max)/150mA(to limit instantaneous
turn-on Iz)
Rmin≥ VIN(max)-VOUT
(to limit Iz under
IOUT(min)+100mA normal operating
conditions)
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 2/9
CYStech Electronics Corp.
Absolute Maximum Ratings
Parameter
Symbol
Vz
Maximum
Units
V
Cathode Voltage
20
100
3
Continuous Cathode Current
Reference Input Current
IZ
mA
mA
IREF
Power Dissipation at TA=25℃
SOT-23
TO-92
Thermal Resistance
PD
0. 37
0.95
W
SOT-23
TO-92
ΘJA
336
132
0 to +70
0 to +150
-65 to +150
300
℃/W
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature(Soldering) 10 seconds
ESD Rating(Human Body Model)
TA
℃
℃
℃
℃
kV
TJ
Tstg
TLEAD
VESD
2
Electrical Characteristics
Unless otherwise specified, TA=25℃. Values in bold apply over full operating ambient temperature range.
LM432D
Typ
LM432C
Typ
Parameter
Symbol
Condition
Min
Max
Min
Max
Unit
V
Reference Voltage
VREF VZ=VREF,IZ=10mA(Note 1)
1.237 1.240 1.243 1.234 1.240 1.246
1.224
1.256 1.222
1.258
25
VREF Temperature
Deviation
VDEV VZ=VREF,IZ=10mA(Note 1)
-
10
25
-
10
mV
Ratio of Change in
-
-1.0
-2.7
-
-1.0
-2.7
0.5
0.4
mV/V
ΔVREF IZ=10mA, ΔVZ=16V to VREF
ΔVZ
IREF
VREF to change in VZ
Reference Input
Current
-
-
0.15
0.5
-
-
0.15
R1=10kΩ,R2=∞,
IZ=10mA(Note2)
R1=10kΩ,R2=∞,
IZ=10mA(Note 2)
μA
μA
μA
Ω
IREF Temperature
IREF(DEV)
0.1
0.4
0.1
Deviation
Off-state Cathode
Current
IZ(OFF) VREF=0V,VZ=6V(Note 3)
VREF=0V,VZ=16V(Note 3)
f <1kHz,VZ=VREF
-
-
-
0.125 0.150
0.135 0.150
0.05
-
-
-
0.125 0.150
0.135 0.150
0.05
Dynamic Output
0.15
0.15
r
z
Impedance
IZ=100μA to 100mA(Note 1)
VZ=VREF(Note 1)
Minimum Operating
Current
IZ(MIN)
-
20
80
-
20
80
μA
Electrical Characteristics(Cont.)
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 3/9
CYStech Electronics Corp.
Unless otherwise specified, TA=25℃. Values in bold apply over full operating ambient temperature range.
LM432B
Typ
LM432A
Typ
Parameter
Symbol
Condition
Min
Max
Min
Max
Unit
V
Reference Voltage
VREF VZ=VREF,IZ=10mA(Note 1)
1.228 1.240 1.252 1.215 1.240 1.265
1.215
1.265 1.200
1.280
35
VREF Temperature
Deviation
VDEV VZ=VREF,IZ=10mA(Note 1)
-
10
25
-
-
10
mV
Ratio of Change in
-
-
-
-1.0
-2.7
-1.0
-2.7
0.5
0.4
mV/V
ΔVREF IZ=10mA, ΔVZ=16V to VREF
ΔVZ
IREF
VREF to change in VZ
Reference Input
Current
0.15
0.5
-
-
0.15
R1=10kΩ,R2=∞,
IZ=10mA(Note2)
R1=10kΩ,R2=∞,
IZ=10mA(Note 2)
μA
μA
μA
Ω
IREF Temperature
IREF(DEV)
0.1
0.4
0.1
Deviation
Off-state Cathode
Current
IZ(OFF) VREF=0V,VZ=6V(Note 3)
VREF=0V,VZ=16V(Note 3)
f<1kHz,VZ=VREF
-
-
-
0.125 0.150
0.135 0.150
0.05
-
-
-
0.125 0.150
0.135 0.150
0.05
Dynamic Output
0.15
0.15
r
z
Impedance
IZ=100μA to 100mA(Note 1)
VZ=VREF(Note 1)
Minimum Operating
Current
IZ(MIN)
-
20
80
-
20
80
μA
Notes:
(1) See Test Circuit 1.
(2) See Test Circuit 2.
(3) See Test Circuit 3.
Recommended Operating Conditions
Symbol
Min
Max
Unit
Cathode Voltage
Cathode Current
VZ
IZ
VREF
16
100
V
mA
0.08
Test Circuits
VIN
VIN
VIN
VZ
VZ
VZ
R1
IZ
IREF
IZ
IREF
IZ(off)
VREF
R2
Test Circuit 3
Off-State
Test Circuit 1
VZ=VREF
Test Circuit 2
VZ>VREF
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 4/9
CYStech Electronics Corp.
TO-92(Top View)
SOT-23(Top View)
Cathode
Anode
3
2
1
2
Cathode
3
Anode
Reference
1
Reference
Block Diagram
Symbol
Cathode
Cathode
REF
REF
VREF
Anode
Ordering Information
Package
Tolerance
0.25%
LM432DA3
LM432DN3
0.5%
1%
2%
LM432AA3
LM432AN3
TO-92
SOT-23
LM432CA3
LM432CN3
LM432BA3
LM432BN3
Characteristic Curves
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 5/9
CYStech Electronics Corp.
Cathode Current vs Cathode Voltage
Cathode Current vs Cathode Voltage
150
100
50
300
200
100
0
Vz=VREF
TA=25℃
Vz=VREF
TA=25℃
0
-50
-100
-150
-100
-200
-300
-1.5
-1
-0.5
0
0.5
1
1.5
-1
-0.5
0
0.5
1
1.5
Cathode Voltage---Vz(V)
Cathode Voltage---Vz(V)
Reference Input Current vs Junction Temperature
Reference Voltage vs Junction Temperature
150
125
100
75
1.248
1.246
1.244
1.242
1.24
Iz=10mA
Iz=10mA
R1=10kΩ
R2=∞
1.238
1.236
1.234
IZ=60μA
50
-50
0
50
100
150
-50
-25
0
25
50
75
100 125 150
Junction Temperature---TJ(℃)
Junction Temperature---TJ(℃)
Off-State Cathode Current
vs Junction Temperature
Ratio of Delta Reference Voltage to Delta Cathode
Voltage vs Junction Temperature
250
1.2
1.1
1
VREF=0V
Vz=16V
Iz=10mA
200
150
100
50
ΔVz=16V to VREF
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
Vz=6V
0
-50 -25
0
25
50
75 100 125 150
-50
-25
0
25
50
75
100 125 150
Junction Temperature---TJ(℃)
Junction Temperature---TJ(℃)
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 6/9
CYStech Electronics Corp.
Reference Impedance vs Frequency
Reference Impedance vs Junction Temperature
100
10
1
0.5
0.45
0.4
TA=25℃
Iz=0.1 to 100mA
REF
Vz=V
f<1kHz
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
0.1
1000
10000
100000
1000000
-50 -25
0
25 50
75 100 125 150
Frequency---f(Hz)
Junction Temperature---TJ(℃)
Small-Signal Phase Shift vs Frequency
Small-Signal Gain vs Frequency
-180
70
60
50
40
30
20
10
0
-225
-270
-315
-360
-10
-20
100
1000
10000
100000
1000000
100
1000
10000
100000
1000000
Frequency---f(Hz)
Frequency---f(Hz)
Stability Boundary Condition For Shunt Regulation
vs Cathode Current and Load Capacitance
3.5
3
TA=25℃
Stable
Stable
2.5
2
1.5
1
Vz=VREF
Vz=2V
1
0.5
0
0.001
0.01
0.1
10
Load Capacitance---CL(μF)
Test Circuit-Small-Signal Gain and Phase
Test Circuit-Stability
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 7/9
CYStech Electronics Corp.
R
OUT
Iz
Iz
R1
10£gF 15k
232
LM432
CL
LM432
8.25k
R2
GND
Applications Information - Stability
Selection of load capacitance when using LM432 as a shunt regulator
When the LM432 is used as a shunt regulator, two options for selection of CL(see diagram on page 6)
are recommended for optimal stability:
1) No load capacitance across the device, decouple at the load.
2) Large capacitance across the device, optimal decoupling at the load.
The reason for this is that LM432 exhibits instability with capacitances in the range of 10nF to 1μF
(approx.) at light cathode currents(up to 3mA typical). The device is less stable the lower the cathode
voltage has been set for. Therefore while the device will be perfectly stable operating at a cathode
current of (say) 10mAwith a 0.1μF capacitor across it, it will oscillate transiently during start-up as the
cathode current passes through the instability region. Selecting a very low (or preferably, no) capaci-
tance, or alternatively a high capacitance(such as 10μF) will avoid this issue altogether. Since the user
will probably wish to have local decoupling at the load anyway, the most cost effective method is to use
no capacitance at all directly across the device. PCB trace/via resistance and inductance prevent the
local load decoupling from causing the oscillation during the transient start-up phase.
Note : if the LM432 is located right at the load, so the load decoupling capacitor is directly across it,
then this capacitor will have to be ≤1nF or ≥10μF.
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 8/9
CYStech Electronics Corp.
TO-92 Dimension
α2
α3
Marking:
A
B
C
1
2
3
432
C
E
D
H
G
α1
I
Style: Pin 1.Reference 2.Anode 3.Cathode
F
3-Lead TO-92 Plastic Package
CYStek Package Code: A3
*: Typical
Millimeters
Inches
Millimeters
Inches
Min. Max.
DIM
DIM
Min.
Max.
Min.
Max.
4.83
4.83
-
Min.
Max.
0.56
*2.54
*1.27
*5°
*2°
*2°
A
B
C
D
E
F
0.1704 0.1902
0.1704 0.1902
4.33
4.33
12.70
0.36
-
G
H
0.0142 0.0220
0.36
-
-
-
-
-
*0.1000
*0.0500
*5°
-
-
-
-
-
0.5000
-
I
0.0142 0.0220
*0.0500
0.1323 0.1480
0.56
*1.27
3.76
α1
α2
α3
-
*2°
3.36
*2°
Notes: 1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYStek sales office.
Material:
• Lead: 42 Alloy ; solder plating
• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
LM432XA3/N3
CYStek Product Specification
Spec. No. : C504N3
Issued Date : 2003.03.21
Revised Date : 2005.10.07
Page No. : 9/9
CYStech Electronics Corp.
SOT-23 Dimension
Marking:
A
L
3
432
S
B
1
2
V
G
3-Lead SOT-23 Plastic
Surface Mounted Package
CYStek Package Code: N3
C
Style: Pin 1.Reference 2.Cathode
3.Anode
D
K
H
J
*: Typical
Millimeters
Inches
Millimeters
Inches
Min. Max.
DIM
DIM
Min.
Max.
Min.
Max.
3.04
1.60
1.30
0.50
2.30
0.10
Min.
Max.
0.177
0.67
1.15
2.75
0.65
A
B
C
D
G
H
0.1102 0.1204
0.0472 0.0630
0.0335 0.0512
0.0118 0.0197
0.0669 0.0910
0.0005 0.0040
2.80
1.20
0.89
0.30
1.70
0.013
J
K
L
0.0034 0.0070
0.0128 0.0266
0.0335 0.0453
0.0830 0.1083
0.0098 0.0256
0.085
0.32
0.85
2.10
0.25
S
V
Notes: 1.Controlling dimension: millimeters.
2.Maximum lead thickness includes lead finish thickness, and minimum lead thickness is the minimum thickness of base material.
3.If there is any question with packing specification or packing method, please contact your local CYCtek sales office.
Material:
• Lead: 42 Alloy; solder plating
• Mold Compound: Epoxy resin family, flammability solid burning class: UL94V-0
Important Notice:
• All rights are reserved. Reproduction in whole or in part is prohibited without the prior written approval of CYStek.
• CYStek reserves the right to make changes to its products without notice.
• CYStek semiconductor products are not warranted to be suitable for use in Life-Support Applications, or systems.
• CYStek assumes no liability for any consequence of customer product design, infringement of patents, or application assistance.
LM432XA3/N3
CYStek Product Specification
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