LM320K-5.0 [NSC]
Series 3-Terminal Negative Regulators; 系列三端稳压器的负
| 型号： | LM320K-5.0 |
| 厂家： | 
National Semiconductor |
| 描述： | Series 3-Terminal Negative Regulators |
| 文件： | 总12页 (文件大小：270K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
November 1994
LM120/LM320
Series 3-Terminal Negative Regulators
General Description
Features
The LM120 series are three-terminal negative regulators
Y
g
Preset output voltage error less than 3%
b
b
b
with a fixed output voltage of 5V, 12V, and 15V, and
up to 1.5A load current capability. Where other voltages are
required, the LM137 and LM137HV series provide an output
Y
Y
Y
Preset current limit
Internal thermal shutdown
Operates with input-output voltage differential down to
1V
b
b
voltage range of 1.2V to 47V.
The LM120 need only one external componentÐa compen-
sation capacitor at the output, making them easy to apply.
Worst case guarantees on output voltage deviation due to
any combination of line, load or temperature variation as-
sure satisfactory system operation.
Y
Y
Y
Excellent ripple rejection
Low temperature drift
Easily adjustable to higher output voltage
LM120 Series Packages and Power Capability
Exceptional effort has been made to make the LM120 Se-
ries immune to overload conditions. The regulators have
current limiting which is independent of temperature, com-
bined with thermal overload protection. Internal current limit-
ing protects against momentary faults while thermal shut-
down prevents junction temperatures from exceeding safe
limits during prolonged overloads.
Rated
Power
Dissipation
Design
Load
Current
Device
Package
LM120/LM320
TO-3 (K)
20W
2W
1.5A
0.5A
1.5A
0.5A
TO-39 (H)
TO-220 (T)
TO-202 (P)
Although primarily intended for fixed output voltage applica-
tions, the LM120 Series may be programmed for higher out-
put voltages with a simple resistive divider. The low quies-
cent drain current of the devices allows this technique to be
used with good regulation.
LM320
15W
7.5W
LM320M
Typical Applications
Dual Trimmed Supply
Fixed Regulator
TL/H/7767–2
*Required if regulator is separated from filter capacitor by more than 3 . For
×
value given, capacitor must be solid tantalum. 25 mF aluminum electrolytic
may be substituted.
²
Required for stability. For value given, capacitor must be solid tantalum. 25
mF aluminum electrolytic may substituted. Values given may be increased
without limit.
For output capacitance in excess of 100 mF, a high current diode from
input to output (1N4001, etc.) will protect the regulator from momentary
input shorts.
TL/H/7767–3
C
1995 National Semiconductor Corporation
TL/H/7767
RRD-B30M115/Printed in U. S. A.
2
3
4
Typical Performance Characteristics
Output Voltage vs
Temperature
Ripple Rejection
(All Types)
Output Impedance TO-3
and TO-220 Packages
TL/H/7767–4
*These curves for LM120.
Derate 25 C further for LM320.
§
5
Typical Performance Characteristics (Continued)
Maximum Average Power
Dissipation (TO-5)
Maximum Average Power
Dissipation (TO-202)
Maximum Average Power
Dissipation (TO-220)
TL/H/7767–5
Typical Applications (Continued)
High Stability 1 Amp Regulator
TL/H/7767–6
Lead and line regulation Ð 0.01% temperature stability Ð 0.2%
Determines Zener current.
²
²²
Solid tantalum.
b
An LM120-12 or LM120-15 may be used to permit higher input voltages, but the regulated output voltage must be at least 15V when using the LM120-12 and
b
18V for the LM120-15.
**Select resistors to set output voltage. 2 ppm/ C tracking suggested.
§
6
Typical Applications (Continued)
Wide Range Tracking Regulator
Current Source
5.0V
R1
TL/H/7767–8
TL/H/7767–7
g
15V, 1 Amp Tracking Regulators
a
b
)
*Resistor tolerance of R1 and R2 determine matching of
inputs.
(
)
and
(
**Necessary only if raw supply capacitors are more than 3 from regulators
×
An LM3086N array may substitute for Q1, D1 and D2 for better stability and
tracking. In the array diode transistors Q5 and Q4 (in parallel) make up D2;
similarly, Q1 and Q2 become D1 and Q3 replaces the 2N2222.
Variable Output
TL/H/7767–12
TL/H/7767–9
Performance (Typical)
e
*Optional. Improves transient response and ripple rejection.
Load Regulation at DI
1A
10 mV
1 mV
L
e
e
1A
Output Ripple, C
IN
Temperature Stability
3000 mF, I
100 mVrms
100 mVrms
a
R1 R2
L
e
V
V
SET
a
a
OUT
50 mV
50 mV
R2
SELECT R2 AS FOLLOWS:
s
s
10 kHz
Output Noise 10 Hz
f
150 mVrms
150 mVrms
a
*Resistor tolerance of R4 and R5 determine matching of ( ) and
b
b
b
LM120-5
LM120-12
LM120-15
300X
750X
1k
b
(
) outputs.
**Necessary only if raw supply filter capacitors are more than 2
from regulators.
×
Light Controllers Using Silicon Photo Cells
TL/H/7767–11
e
a
*Lamp brightness increases until i
i
Q
(1 mA)
5V/R1.
I
TL/H/7767–10
²
Necessary only if raw supply filter capacitor is more than 2 from LM320.
×
e
*Lamp brightness increases until i
5V/R1 (i can be set as low as 1 mA).
I
I
²
Necessary only of raw supply filter capacitor is more than
LM320MP.
2
from
×
7
Connection Diagrams
TL/H/7767–13
TL/H/7767–14
Bottom View
Bottom View
Metal Can Package TO-39 (H)
Steel Metal Can Package TO-3 (K)
Order Number LM120H-5.0, LM120H-12, LM120H-15,
LM120H-5.0/883, LM120H-12/883, LM120H-15/883,
LM320H-5.0, LM320H-12 or LM320H-15
Order Number LM120K-5.0/883, LM120K-12/883,
LM120K-15/883, LM320K-5.0, LM320K-12 or LM320K-15
See NS Package Number K02A
See NS Package Number H03A
TL/H/7767–17
Front View
Power Package TO-220 (T)
Order Number LM320T-5.0, LM320T-12 or LM320T-15
See NS Package Number T03B
Schematic Diagrams
b
5V
TL/H/7767–18
8
Schematic Diagrams (Continued)
b
b
12V and 15V
TL/H/7767–19
Physical Dimensions inches (millimeters)
Metal Can Package (TO-39) (H)
Order Number LM120H-5.0, LM120H-12, LM120H-15, LM320H-5.0, LM320H-12 or LM320H-15
NS Package Number H03A
9
Physical Dimensions inches (millimeters) (Continued)
Steel Metal Can Package TO-3 (K)
Order Number LM120K-5.0, LM120K-12, LM120K-15, LM320K-5.0, LM320K-12 or LM320K-15
NS Package Number K02A
Aluminum Metal Can Package TO-3 (KC)
Order Number LM320KC-5.0, LM320KC-12 or LM320KC-15
NS Package Number KC02A
10
Physical Dimensions inches (millimeters) (Continued)
Power Package TO-202 (P)
Order Number LM320MP-5.0, LM320MP-12 or LM320MP-15
NS Package Number P03A
11
Physical Dimensions inches (millimeters) (Continued)
Power Package TO-220 (T)
Order Number LM320T-5.0, LM320T-12 or LM320T-15
NS Package Number T03B
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