LM320 National Semiconductor Corporation, LM320 Datasheet

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LM320

Manufacturer Part Number
LM320
Description
Series 3-terminal Negative Regulators
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2007 National Semiconductor Corporation
LM120/LM320
Series 3-Terminal Negative Regulators
General Description
The LM120 series are three-terminal negative regulators 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 voltage range
of −1.2V to −47V.
The LM120 need only one external component—a 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 assure sat-
isfactory system operation.
Exceptional effort has been made to make the LM120 Series
immune to overload conditions. The regulators have current
limiting which is independent of temperature, combined with
thermal overload protection. Internal current limiting protects
against momentary faults while thermal shutdown prevents
junction temperatures from exceeding safe limits during pro-
longed overloads.
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 quiescent
Typical Applications
Dual Trimmed Supply
7767
776703
drain current of the devices allows this technique to be used
with good regulation.
Features
*Required if regulator is separated from filter capacitor by more than 3 inch-
es. For value given, capacitor must be solid tantalum. 25 μF aluminum
electrolytic may be substituted.
†Required for stability. For value given, capacitor must be solid tantalum. 25
μF aluminum electrolytic may be substituted. Values given may be increased
without limit.
For output capacitance in excess of 100 μF, a high current diode from input
to output (1N4001, etc.) will protect the regulator from momentary input
shorts.
LM120/LM320 TO-3 (K)
LM320
Preset output voltage error less than ±3%
Preset current limit
Internal thermal shutdown
Operates with input-output voltage differential down to 1V
Excellent ripple rejection
Low temperature drift
Easily adjustable to higher output voltage
Device
LM120 Series Packages and Power Capability
TO-39 (H)
TO-220 (T)
Package
Fixed Regulator
Dissipation
Power
Rated
20W
15W
2W
November 15, 2007
www.national.com
776702
Current
Design
Load
1.5A
0.5A
1.5A

Related parts for LM320

LM320 Summary of contents

Page 1

... Low temperature drift ■ Easily adjustable to higher output voltage LM120 Series Packages and Power Capability Device LM120/LM320 TO-3 (K) LM320 *Required if regulator is separated from filter capacitor by more than 3 inch- es. For value given, capacitor must be solid tantalum. 25 μF aluminum electrolytic may be substituted. †Required for stability. For value given, capacitor must be solid tantalum. 25 μ ...

Page 2

... MAX ≤ MAX ≤ LOAD μ mA ≤ ≤ f 100 kHz 2 −65°C to +150°C Metal Can Package LM120K-5.0 LM320K-5.0 (TO-3) (TO-3) 1.5A 20W Typ Max Min Typ Max −5 −4.9 −5.2 −5 −4 −7 −25 − ...

Page 3

... D ≤ MAX ≤ 0. MAX ≤ 0. LOAD μ mA, 150 L L ≤ ≤ f 100 kHz 5 3 Metal Can Package LM320H-5.0 (TO-39) 0.5A 2W Max Min Typ Max −4.9 −5.2 −5 −4 −7 −25 − −4.80 −5.25 −4. ...

Page 4

... Note 2: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320 series does have low thermal feedback, improving line and load regulation. On all other tests, even though power dissipation is internally limited, electrical specifications apply only Note 3: For − ...

Page 5

... Metal Can Package LM320H-12 (TO-39) 0.2A 2W Max Min Typ Max −11.7 −12.4 −12 −11 www.national.com 30V (Note 6) 300°C Units μV mV °C/W °C/W Units ...

Page 6

... Typ Max −14 −32 − −11.5 −12.6 −11 0.4 0.05 0.4 0.4 0.03 0.4 400 120 12 120 (Note 8) (Note 8) (Note 8) (Note 8) Power Plastic Package LM320T-12 (TO-220) 1A 15W Min Typ Max −12.4 −12 −11 −32 −14 −12.6 −11 0.1 0.4 0.1 0.4 400 24 Units V dB ...

Page 7

... Note 7: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320 series does have low thermal feedback, improving line and load regulation. On all other tests, even though power dissipation is internally limited, electrical specifications apply only Note 8: Thermal resistance of typically 85° ...

Page 8

... Metal Can Package LM320H-15 (TO-39) (TO-39) 0.2A 2W Typ Max Min Typ Max −15 −14.7 −15.4 −15 −14 −40V −35V 30V (Note 10) 300°C Units μV mV ° ...

Page 9

... Max −17 −35 − −14.5 −15.6 −14 0.4 0.05 0.4 0.4 0.03 0.4 400 150 15 150 (Note 12) (Note 12) (Note 12) (Note 12) Power Plastic Package LM320T-15 (TO-220) 1A 15W Min Typ Max −15.5 −15 −14 −35 −17 −15.7 −14 0.1 0.4 0.1 0.4 400 30 Units V dB ...

Page 10

... Note 11: Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To ensure constant junction temperature, low duty cycle, pulse testing is used. The LM120/LM320 series does have low thermal feedback, improving line and load regulation. On all other tests, even though power dissipation is internally limited, electrical specifications apply only Note 12: Thermal resistance of typically 85° ...

Page 11

... Minimum Input-Output Differential TO-3 and TO-220 Packages Quiescent Current vs Input Voltage Maximum Average Power Dissipation (TO-3) *These curves for LM120. Derate 25°C further for LM320. Maximum Average Power Dissipation (TO-202) 776724 776726 Maximum Average Power 776728 Maximum Average Power 776730 11 Minimum Input-Output Differential TO-5 and ...

Page 12

Short Circuit Current www.national.com 776732 12 ...

Page 13

Typical Applications Lead and line regulation — 0.01% temperature stability — 0.2% †Determines Zener current. ††Solid tantalum. 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 ...

Page 14

... R4 and R5 determine matching of (+) and (−) outputs. **Necessary only if raw supply filter capacitors are more than 2 inches from regulators. 776712 *Lamp brightness increases until i †Necessary only if raw supply filter capacitor is more than 2 inches from LM320. 776710 can be set as low as 1 μA ...

Page 15

... Bottom View Metal Can Package TO-39 (H) 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 See NS Package Number H03A 776714 Power Package TO-220 (T) Order Number LM320T-5.0, LM320T-12 or LM320T-15 See NS Package Number T03B 776713 15 776717 Front View www.national.com ...

Page 16

Schematic Diagrams www.national.com −5V −12V and −15V 16 776718 776719 ...

Page 17

... Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM120H-5.0, LM120H-12, LM120H-15, LM320H-5.0, LM320H-12 or LM320H-15 Metal Can Package (TO-39) (H) NS Package Number H03A 17 www.national.com ...

Page 18

... Order Number LM120K-5.0, LM120K-12, LM120K-15, LM320K-5.0, LM320K-12 or LM320K-15 www.national.com Steel Metal Can Package TO-3 (K) NS Package Number K02A Power Package TO-220 (T) Order Number LM320T-5.0, LM320T-12 or LM320T-15 NS Package Number T03B 18 ...

Page 19

Notes 19 www.national.com ...

Page 20

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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