KA337TU [ONSEMI]
3 端子 1.5 A 负向可调节稳压器;
| 型号： | KA337TU |
| 厂家： | 
ONSEMI |
| 描述： | 3 端子 1.5 A 负向可调节稳压器 局域网 输出元件 电源电路 线性稳压器IC 调节器 |
| 文件： | 总8页 (文件大小：176K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Order this document by LM337/D
THREE–TERMINAL
ADJUSTABLE NEGATIVE
VOLTAGE REGULATOR
The LM337 is an adjustable 3–terminal negative voltage regulator
capable of supplying in excess of 1.5 A over an output voltage range of
–1.2 V to –37 V. This voltage regulator is exceptionally easy to use and
requires only two external resistors to set the output voltage. Further, it
employs internal current limiting, thermal shutdown and safe area
compensation, making it essentially blow–out proof.
The LM337 serves a wide variety of applications including local, on card
regulation. This device can also be used to make a programmable output
regulator, or by connecting a fixed resistor between the adjustment and
output, the LM337 can be used as a precision current regulator.
SEMICONDUCTOR
TECHNICAL DATA
• Output Current in Excess of 1.5 A
• Output Adjustable between –1.2 V and –37 V
• Internal Thermal Overload Protection
• Internal Short Circuit Current Limiting Constant with Temperature
• Output Transistor Safe–Area Compensation
• Floating Operation for High Voltage Applications
• Eliminates Stocking many Fixed Voltages
T SUFFIX
PLASTIC PACKAGE
CASE 221A
Heatsink surface
connected to Pin 2.
2
• Available in Surface Mount D PAK and Standard 3–Lead Transistor
Package
1
2
3
Pin 1. Adjust
2. V
3. V
in
out
Standard Application
I
PROG
D2T SUFFIX
PLASTIC PACKAGE
CASE 936
R
+
+
2
C
*
µ
C **
O
in
1.0
F
R
120
1.0 µF
1
2
3
2
1
(D PAK)
I
Adj
Heatsink surface (shown as terminal 4 in
case outline drawing) is connected to Pin 2.
V
V
out
in
LM337
–V
in
–V
out
ORDERING INFORMATION
Operating
*C is required if regulator is located more than 4 inches from power supply filter.
in
*A 1.0
µF solid tantalum or 10 µF aluminum electrolytic is recommended.
Temperature Range
Device
LM337BD2T
LM337BT
LM337D2T
LM337T
Package
Surface Mount
Insertion Mount
Surface Mount
Insertion Mount
**C is necessary for stability. A 1.0
O
µF solid tantalum or 10 µF aluminum electrolytic
T = –40° to +125°C
J
**is recommeded.
R
2
V
–1.25 V
1
T = 0° to +125°C
J
out
R
1
Motorola, Inc. 1996
Rev 1
LM337
MAXIMUM RATINGS
Rating
Symbol
V –V
Value
Unit
Input–Output Voltage Differential
40
Vdc
I
O
Power Dissipation
Case 221A
T
A
= +25°C
P
D
Internally Limited
W
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
θ
θ
65
5.0
°C/W
°C/W
JA
JC
2
Case 936 (D PAK)
= +25°C
T
P
θ
θ
Internally Limited
W
°C/W
°C/W
A
D
JA
JC
Thermal Resistance, Junction–to–Ambient
Thermal Resistance, Junction–to–Case
70
5.0
Operating Junction Temperature Range
Storage Temperature Range
T
–40 to +125
–65 to +150
°C
°C
J
T
stg
ELECTRICAL CHARACTERISTICS (|V V | = 5.0 V; I = 0.5 A for T package; T = T
I– O low
to T
[Note 1]; I
max
and P
max
[Note 2].)
O
J
high
Characteristics
Figure
Symbol
Min
Typ
Max
Unit
Line Regulation (Note 3), T = +25°C, 3.0 V ≤ |V –V | ≤ 40 V
1
2
Reg
–
0.01
0.04
%/V
A
I
O
line
Load Regulation (Note 3), T = +25°C, 10 mA ≤ I ≤ I
Reg
load
A
O
max
|V | ≤ 5.0 V
–
–
15
0.3
50
1.0
mV
% V
O
O
|V | ≥ 5.0 V
O
Thermal Regulation, T = +25°C (Note 6), 10 ms Pulse
Reg
–
–
–
0.003
65
0.04
100
5.0
% V /W
O
A
therm
Adjustment Pin Current
3
I
µA
µA
Adj
Adjustment Pin Current Change, 2.5 V ≤ |V –V | ≤ 40 V,
1, 2
∆I
Adj
2.0
I
O
10 mA ≤ I ≤ I
, P ≤ P
D
, T = +25°C
max A
L
max
Reference Voltage, T = +25°C, 3.0 V ≤ |V –V | ≤ 40 V,
3
V
ref
–1.213
–1.20
–1.250
–1.25
–1.287
–1.30
V
A
I
O
10 mA ≤ I ≤ I
, P ≤ P
D
, T = T
J
to T
O
max
max
low
high
Line Regulation (Note 3), 3.0 V ≤ |V –V | ≤ 40 V
1
2
Reg
–
0.02
0.07
%/V
mV
I
O
line
Load Regulation (Note 3), 10 mA ≤ I ≤ I
Reg
O
max
load
|V | ≤ 5.0 V
–
–
20
0.3
70
1.5
O
|V | ≥ 5.0 V
% V
O
O
O
Temperature Stability (T
≤ T ≤ T
)
3
3
T
S
–
0.6
–
% V
low
J
high
Minimum Load Current to Maintain Regulation
(|V –V | ≤ 10 V)
I
mA
Lmin
–
–
1.5
2.5
6.0
10
I
O
(|V –V | ≤ 40 V)
I
O
Maximum Output Current
|V –V | ≤ 15 V, P ≤ P
3
I
max
A
, T Package
, T = +25°C, T Package
J
–
–
1.5
0.15
2.2
0.4
I
O
D
max
max
|V –V | ≤ 40 V, P ≤ P
I
O
D
RMS Noise, % of V , T = +25°C, 10 Hz ≤ f ≤ 10 kHz
N
–
0.003
–
% V
O
O
A
Ripple Rejection, V = –10 V, f = 120 Hz (Note 4)
4
3
RR
dB
O
Without C
–
66
60
77
–
–
Adj
C
= 10 µF
Adj
Long–Term Stability, T = T
J
Endpoint Measurements
(Note 5), T = +25°C for
S
–
–
0.3
1.0
%/1.0 k
Hrs.
high
A
Thermal Resistance Junction–to–Case, T Package
R
4.0
–
°C/W
θJC
NOTES: 1. T
to T
= 1.5 A, P
= 0° to +125°C, for LM337T, D2T.
= 20 W
T
low
to T = –40° to +125°C, for LM337BT, BD2T.
high
low
high
2. I
max
max
3. Load and line regulation are specified at constant junction temperature. Change in V because of heating effects is covered under the Thermal
O
Regulation specification. Pulse testing with a low duty cycle is used.
4. C , when used, is connected between the adjustment pin and ground.
Adj
5. Since Long Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from
lot to lot.
6. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These
effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients
on the output voltage and is expressed in percentage of output change per watt of power change in a specified time.
2
MOTOROLA ANALOG IC DEVICE DATA
LM337
Representative Schematic Diagram
Adjust
60
100
2.0k
2.5k
810
21k
V
out
10k
800
25pF
15pF
220
5.0k
2.0k
75
0
60k
100k
15pF
800
18k
4.0k
6.0k
100
1.0k
2.2k
18k
240
3.0k
9.6k
30k
270
2.0
pF
250
5.0pF
5.0k
100pF
20k
8.0k
0.2
100k
600
15
2.9k
4.0k
155
2.4k
500
15
500
0.05
V
in
This device contains 39 active transistors.
Figure 1. Line Regulation and ∆I
Adj
/Line Test Circuit
R
1%
2
+
C
1.0 µF
C
1.0 µF
O
I
in
Adj
120
1%
R
1
R
L
Adjust
* Pulse testing required.
1% Duty Cycle
is suggested.
V
V
in
out
LM337
V
V
V
V
IH
IL
OH
OL
*
|V –V
|
OL OH
Line Regulation (% V)
x 100
V
EE
|V
|
OH
3
MOTOROLA ANALOG IC DEVICE DATA
LM337
Figure 2. Load Regulation and ∆I
/Load Test Circuit
Adj
* Pulse testing required.
1% Duty Cycle is suggested.
R
1%
2
C
O
+
C
1.0 µF
in
1.0 µF
I
Adj
R
120
1
*
Adjust
R
(max
L
–V (min Load)
O
Load)
V
V
out
in
–V
I
L
LM337
–V (max Load)
I
O
V
O
(min Load) – V (max Load)
O
Load Regulation (mV) = V (min Load) – V (max Load)
Load Regulation (% V ) =
x 100
O
O
O
V
(min Load)
O
Figure 3. Standard Test Circuit
1%
R
2
+
C
O
C
in
1.0 µF
1.0
µF
V
V
O
I
R
L
V
I
ref
Adj
R
120
1
Adjust
V
V
in
out
I
LM337
L
V
O
To Calculate R :
2
R
=
– 1
R
1
2
V
ref
* Pulse testing required.
* 1% Duty Cycle is suggested.
This assumes I
is negligible.
Adj
Figure 4. Ripple Rejection Test Circuit
+
C
10µF
Adj
R
1%
2
+
V
C
in
C
O
1.0
V
µ
F
1.0 µF
O
R
L
Adjust
D *
1N4002
1
120
R
1
V
in
out
LM337
V
= –1.25 V
out
14.3 V
4.3 V
* D Discharges C
Adj
if output is shorted to Ground.
1
f = 120 Hz
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specificallydisclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola
datasheetsand/orspecificationscananddovaryindifferentapplicationsandactualperformancemayvaryovertime. Alloperatingparameters,including“Typicals”
must be validated for each customer application by customer’s technical experts. Motorola does not convey any license under its patent rights nor the rights of
others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other
applicationsintended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury
ordeathmayoccur. ShouldBuyerpurchaseoruseMotorolaproductsforanysuchunintendedorunauthorizedapplication,BuyershallindemnifyandholdMotorola
and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees
arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that
Motorola was negligent regarding the design or manufacture of the part. Motorola and
Opportunity/Affirmative Action Employer.
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal
4
MOTOROLA ANALOG IC DEVICE DATA
LM337
Figure 5. Load Regulation
Figure 6. Current Limit
0.2
0
4.0
I
= 0.5 A
L
–0.2
–0.4
–0.6
–0.8
–1.0
–1.2
–1.4
3.0
2.0
1.0
0
T
= 25°C
J
I
= 1.5 A
150
L
V
V
= –15 V
in
= –10 V
out
0
10
20
30
40
–50 –25
0
25
50
75
100 125
C)
V
–V
, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
in out
T , JUNCTION TEMPERATURE (
°
J
Figure 7. Adjustment Pin Current
Figure 8. Dropout Voltage
3.0
80
75
70
65
60
V
∆
= –5.0 V
= 100 mV
out
O
V
2.5
2.0
1.5
I
= 1.5 A
L
1.0 A
55
50
500 mA
200 mA
20 mA
45
40
1.0
–50 –25
0
25
50
75
100 125
C)
150
–50 –25
0
25
50
75
100 125
C)
150
T , JUNCTION TEMPERATURE (
°
T , JUNCTION TEMPERATURE (
°
J
J
Figure 9. Temperature Stability
Figure 10. Minimum Operating Current
1.27
1.26
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1.25
1.24
1.23
T
= 25°C
J
–50 –25
0
25
50
75
100 125
C)
150
0
10
20
30
40
T , JUNCTION TEMPERATURE (
°
V
–V
, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (Vdc)
J
in out
5
MOTOROLA ANALOG IC DEVICE DATA
LM337
Figure 11. Ripple Rejection versus Output Voltage
Figure 12. Ripple Rejection versus Output Current
100
80
60
40
20
0
100
C
= 10 µF
Adj
C
= 10 µF
80
Adj
Without C
Adj
60
40
Without C
Adj
V
= –15 V
= –10 V
in
V
I
– V
= 5.0 V
= 500 mA
in
L
out
V
out
f = 120 Hz
T = 25
20
0
f = 120 Hz
= 25
°C
J
T
°C
J
0
–5.0
–10
–15
–20
–25
–30
–35
–40
0.01
0.1
1.0
10
I
, OUTPUT CURRENT (A)
V
, OUTPUT VOLTAGE (V)
O
out
Figure 13. Ripple Rejection versus Frequency
Figure 14. Output Impedance
1
0
100
80
60
40
20
10
V
= –15 V
= –10 V
= 500 mA
V
in
= –15 V
= –10 V
in
V
V
out
out
I
I
= 500 mA
10
L
L
T
= 25°C
C
T
= 1.0 µF
= 25°C
C
=10
µ
F
J
L
Adj
J
–1
–2
–3
10
10
10
Without C
Adj
Without C
Adj
C
= 10 µF
Adj
0
10
100 1.0 k
10 k
100 k 1.0 M
10 M
10
100
1.0 k
10 k
100 k
1.0 M
f, FREQUENCY (Hz)
f, FREQUENCY (Hz)
Figure 15. Line Transient Response
Figure 16. Load Transient Reponse
0.6
0.4
0.2
0
0.8
0.6
0.4
Without C
Adj
0.2
0
–0.2
Without C
= –10 V
= 50 mA
= 25°C
= 1.0 µF
C
= 10 µF
Adj
Adj
–0.4
–0.6
C
= 10 µF
Adj
–0.2
–0.4
= –15 V
= –10 V
= 50 mA
= 25°C
= 1.0 µF
in
0
V
out
0
–0.5
–1.0
–0.5
I
T
L
J
L
J
L
–1.0
–1.5
C
0
10
20
t, TIME (
30
40
0
10
20
t, TIME (µs)
30
40
µs)
6
MOTOROLA ANALOG IC DEVICE DATA
LM337
APPLICATIONS INFORMATION
Basic Circuit Operation
The LM337 is a 3–terminal floating regulator. In operation,
the LM337 develops and maintains a nominal –1.25 V
degrading regulation. The ground end of R can be returned
2
near the load ground to provide remote ground sensing and
improve load regulation.
reference (V ) between its output and adjustment terminals.
ref
This reference voltage is converted to a programming current
External Capacitors
(I
)byR (seeFigure17),andthisconstantcurrentflows
PROG
1
A 1.0 µF tantalum input bypass capacitor (C ) is
in
through R from ground.
2
recommended to reduce the sensitivity to input line
impedance.
The regulated output voltage is given by:
R
2
The adjustment terminal may be bypassed to ground to
V
V
1
I
R
out
2
ref
Adj
R
improve ripple rejection. This capacitor (C ) prevents ripple
Adj
1
from being amplified as the output voltage is increased. A
10 µF capacitor should improve ripple rejection about 15 dB
at 120 Hz in a 10 V application.
Since the current into the adjustment terminal (I
)
Adj
represents an error term in the equation, the LM337 was
designed to control I to less than 100 µA and keep it
Adj
An output capacitance (C ) in the form of a 1.0 µF
O
constant. To do this, all quiescent operating current is
returned to the output terminal. This imposes the requirement
for a minimum load current. If the load current is less than this
minimum, the output voltage will rise.
tantalum or 10 µF aluminum electrolytic capacitor is required
for stability.
Protection Diodes
When external capacitors are used with any IC regulator it
is sometimes necessary to add protection diodes to prevent
the capacitors from discharging through low current points
into the regulator.
Since the LM337 is a floating regulator, it is only the
voltage differential across the circuit which is important to
performance, and operation at high voltages with respect to
ground is possible.
Figure 18 shows the LM337 with the recommended
protection diodes for output voltages in excess of –25 V or
Figure 17. Basic Circuit Configuration
+
V
out
highcapacitance values (C > 25 µF, C
> 10 µF). DiodeD
O
Adj
1
prevents C from discharging thru the IC during an input
O
R
I
2
short circuit. Diode D protects against capacitor C
PROG
2
Adj
I
Adj
+
discharging through the IC during an output short circuit. The
combination of diodes D and D prevents C from the
C
O
1
2
Adj
discharging through the IC during an input short circuit.
R
Adjust
1
V
ref
Figure 18. Voltage Regulator with Protection Diodes
+
V
V
V
–
LM337
in
out
out
+
V
out
R
2
C
Adj
+
+
V
= –1.25 V Typical
ref
C
C
O
in
Adjust
LM337
R
D
2
1N4002
1
Load Regulation
The LM337 is capable of providing extremely good load
regulation, but a few precautions are needed to obtain
maximum performance. For best performance, the
–V
in
– V
out
V
V
out
in
programming resistor (R ) should be connected as close to
the regulator as possible to minimize line drops which
effectively appear in series with the reference, thereby
1
D1
1N4002
2
Figure 19. D PAK Thermal Resistance and Maximum
Power Dissipation versus P.C.B. Copper Length
3.5
80
P
for T = +50°C
A
D(max)
3.0
70
Free Air
Mounted
Vertically
2.0 oz. Copper
L
60
50
40
30
2.5
2.0
Minimum
Size Pad
L
1.5
1.0
R
θ
JA
0
5.0
10
15
20
25
30
L, LENGTH OF COPPER (mm)
7
MOTOROLA ANALOG IC DEVICE DATA
LM337
OUTLINE DIMENSIONS
T SUFFIX
PLASTIC PACKAGE
CASE 221A–06
ISSUE Y
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIM Z DEFINES A ZONE WHERE ALL BODY AND
LEAD IRREGULARITIES ARE ALLOWED.
SEATING
–T
PLANE
–
F
B
C
T
S
INCHES
MILLIMETERS
DIM
A
B
C
D
F
G
H
J
K
L
N
Q
R
S
MIN
MAX
0.620
MIN
14.48
9.66
4.07
0.64
3.61
2.42
2.80
0.46
12.70
1.15
4.83
2.54
2.04
1.15
5.97
0.00
1.15
–
MAX
15.75
10.28
0.570
0.380
0.160
0.025
0.142
0.095
0.110
0.018
0.500
0.045
0.190
0.100
0.080
0.045
0.235
0.000
0.045
–
4
0.405
0.190
0.035
0.147
0.105
0.155
0.025
0.562
0.060
0.210
0.120
0.110
0.055
0.255
0.050
–
A
K
Q
Z
4.82
0.88
3.73
2.66
3.93
0.64
14.27
1.52
5.33
3.04
2.79
1.39
6.47
1.27
–
1
2
3
U
H
L
R
J
V
T
U
V
G
D
Z
0.080
2.04
N
D2T SUFFIX
PLASTIC PACKAGE
CASE 936–03
2
(D PAK)
ISSUE B
OPTIONAL
CHAMFER
NOTES:
1
TERMINAL 4
DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
CONTROLLING DIMENSION: INCH.
TAB CONTOUR OPTIONAL WITHIN DIMENSIONS
A AND K.
–T
–
A
U
2
3
E
4
5
DIMENSIONS U AND V ESTABLISH A MINIMUM
MOUNTING SURFACE FOR TERMINAL 4.
DIMENSIONS A AND B DO NOT INCLUDE MOLD
FLASH OR GATE PROTRUSIONS. MOLD FLASH
AND GATE PROTRUSIONS NOT TO EXCEED
0.025 (0.635) MAXIMUM.
S
K
V
B
H
F
INCHES
MILLIMETERS
MIN MAX
9.804 10.236
1
2
3
DIM
A
B
C
D
E
MIN
MAX
0.403
0.368
0.180
0.036
0.055
0.386
0.356
0.170
0.026
0.045
M
L
9.042
4.318
0.660
1.143
9.347
4.572
0.914
1.397
P
J
N
F
0.051 REF
0.100 BSC
0.539 0.579 13.691 14.707
0.125 MAX
0.050 REF
1.295 REF
2.540 BSC
D
G
H
J
K
L
M
N
P
R
S
R
M
0.010 (0.254)
T
3.175 MAX
1.270 REF
G
0.000
0.088
0.018
0.058
5
0.010
0.102
0.026
0.078
0.000
0.254
2.591
0.660
1.981
2.235
0.457
1.473
5
REF
REF
C
0.116 REF
0.200 MIN
0.250 MIN
2.946 REF
5.080 MIN
6.350 MIN
U
V
How to reach us:
USA/EUROPE/Locations Not Listed: Motorola Literature Distribution;
JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center,
P.O. Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454
3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315
MFAX: RMFAX0@email.sps.mot.com – TOUCHTONE 602–244–6609
INTERNET: http://Design–NET.com
ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park,
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298
LM337/D
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相关型号：
KA339ADTF
Comparator, 4 Func, 4000uV Offset-Max, 1400ns Response Time, BIPolar, PDSO14, SOP-14
FAIRCHILD
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