LM325AN [NSC]
IC VREG DUAL OUTPUT, FIXED MIXED REGULATOR, PDIP14, PLASTIC, DIP-14, Fixed Mixed Multiple Output Standard Regulator;
| 型号： | LM325AN |
| 厂家： | 
National Semiconductor |
| 描述： | IC VREG DUAL OUTPUT, FIXED MIXED REGULATOR, PDIP14, PLASTIC, DIP-14, Fixed Mixed Multiple Output Standard Regulator 光电二极管 输出元件 调节器 |
| 文件： | 总8页 (文件大小：221K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1999
LM325
Dual Voltage Regulator
General Description
This dual polarity tracking regulator is designed to provide
balanced positive and negative output voltages at current up
Features
±
n
15V tracking outputs
n Output current to 100 mA
±
to 100 mA, and is set for 15V outputs. Input voltages up to
±
n Output voltage balanced to within 2%
n Line and load regulation of 0.06%
n Internal thermal overload protection
n Standby current drain of 3 mA
n Externally adjustable current limit
n Internal current limit
30V can be used and there is provision for adjustable cur-
rent limiting. The device is available in two package types to
accommodate various power requirements and temperature
ranges.
Schematic and Connection Diagrams
Metal Can Package
DS007776-3
Case connected to −V
IN
Top View
Order Number LM325H
See NS Package Number H10C
DS007776-1
© 1999 National Semiconductor Corporation
DS007776
www.national.com
Absolute Maximum Ratings (Note 1)
Output Short-Circuit Duration (Note 4)
Continuous
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Operating Conditions
Operating Free Temperature Range
Storage Temperature Range
0˚C to +70˚C
−65˚C to +150˚C
300˚C
±
Input Voltage
30V
+
Forced VO (Min) (Note 2)
−0.5V
+0.5V
PMAX
Lead Temperature (Soldering, 10 sec.)
−
Forced VO (Max) (Note 2)
Power Dissipation (Note 3)
Electrical Characteristics
Parameter
Conditions
Min
14.5
2.0
Typ
Max
Units
=
Output Voltage
Input-Output Differential
Line Regulation
Tj 25˚C
15
15.5
V
V
=
=
VIN 18V to 30V, IL 20 mA,
2.0
20
10
20
mV
mV
=
Tj 25˚C
= =
VIN 18V to 30V, IL 20 mA,
Line Regulation Over Temperature Range
Load Regulation
=
=
=
±
IL 0 mA to 50 mA, VIN
30V,
+
VO
VO
T
25˚C
3.0
5.0
10
10
mV
mV
j
−
=
=
±
Load Regulation Over Temperature Range
IL 0 mA to 50 mA, VIN
30V
+
VO
4.0
7.0
20
20
mV
mV
−
VO
=
±
Output Voltage Balance
Tj 25˚C
300
mV
Output Voltage Over Temperature Range
P ≤ PMAX, 0 ≤ IO ≤ 50 mA,
18V ≤ |VIN| ≤ 30
14.27
15.73
V
±
Temperature Stability of VO
Short Circuit Current Limit
Output Noise Voltage
0.3
%
mA
=
Tj 25˚C
260
150
1.75
3.1
=
=
Tj 25˚C, BW 100 − 10 kHz
µVrms
mA
=
Positive Standby Current
Negative Standby Current
Long Term Stability
Tj 25˚C
3.0
5.0
=
Tj 25˚C
mA
0.2
%/kHr
Thermal Resistance Junction to
Case (Note 5)
LM325H
Junction to Ambient
Junction to Ambient
20
215
82
˚C/W
˚C/W
˚C/W
(Still Air)
(400 Lf/min Air Flow)
Junction to Ambient
LM325N
(Still Air)
90
˚C/W
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: That voltage to which the output may be forced without damage to the device.
=
=
=
=
=
2.0W for the H10
MAX
±
Note 3: Unless otherwise specified these specifications apply for T 0˚C to +125˚C on LM325, V
20V, I
0 mA, I
100 mA, P
j
IN
L
MAX
Package.
Note 4: If the junction temperature exceeds 150˚C, the output short circuit duration is 60 seconds.
Note 5: Without a heat sink, the thermal resistance junction to ambient of the H10 Package is about 155˚C/W. With a heat sink, the effective thermal resistance can
only approach the junction to case values specified, depending on the efficiency of the sink.
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2
Typical Performance Characteristics
Load Regulation
Standby Current Drain
Regulator Dropout Voltage
for Positive Regulator
DS007776-12
DS007776-11
DS007776-13
Regulator
Dropout Voltage for
Negative Regulator
Peak Output
Current vs
Junction Temperature
LM325 Maximum Average
Power Dissipation vs
Ambient Temperature
DS007776-14
DS007776-15
DS007776-17
Load Transient Response
for Positive Regulator
Load Transient Response
for Negative Regulator
Line Transient Response
for Positive Regulator
DS007776-21
DS007776-20
DS007776-22
3
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Typical Performance Characteristics (Continued)
Line Transient Response
for Negative Regulator
Ripple Rejection
Output Impedance
vs Frequency
DS007776-24
DS007776-25
DS007776-23
Typical Applications
†††
Basic Regulator
DS007776-6
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4
Typical Applications (Continued)
2.0 Amp Boosted Regulator with Current Limit
DS007776-7
Note: Metal can (H) packages shown.
†
Solid tantalum
††
Short pins 6 and 7 on dip
†††
R
can be added to the basic regulator between pins 6 and 5, 1 and 2 to reduce current limit.
CL
*Required if regulator is located an appreciable distance from power supply filter.
*
*
Although no capacitor is needed for stability, it does help transient response. (If needed use 1 µF electrolytic.)
* *
*
Although no capacitor is needed for stability, it does help transient response. (If needed use 10 µF electrolytic.)
Positive Current Dependent Simultaneous Current Limiting
DS007776-8
5
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Typical Applications (Continued)
Boosted Regulator With Foldback Current Limit
DS007776-9
Positive Reg.
=
=
=
I
I
@
2.0A
750 mA
25˚C
MAX
+
SC
T
A
=
+V
+25V
IN
Negative Reg.
=
I
I
2.0A
750 mA
MAX
=
SC
=
=
@
T
25˚C
−25V
A
−V
IN
Resistor Values
125
126
20
R1
R2
R3
R6
RCL
18
310
2.4k
300
0.7
180
1.35k
290
0.9
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6
Typical Applications (Continued)
Electric Shutdown
DS007776-10
†
Solid tantalum
††
Short pins 6 and 7 on dip
*Required if regulator is located an appreciable distance from power supply filter.
**
Although no capacitor is needed for stability, it does help transient response. (If needed use 1 µF electrolytic.)
7
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Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (H)
Order Number LM325H
NS Package Number H10C
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
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systems which, (a) are intended for surgical implant
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whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
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