JM38510/11501BX - National Semiconductor

TL/H/7767

LM120/LM320 Series 3-Terminal Negative Regulators

November 1994

LM120/LM320

Series 3-Terminal Negative Regulators

General Description

The LM120 series are three-terminal negative regulators

with a fixed output voltage of b5V, b12V, and b15V, and

up to 1.5A load current capability. Where other voltages are

required, the LM137 and LM137HV series provide an output

voltage range of b1.2V to b47V.

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.

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.

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.

Features

YPreset output voltage error less than g3%

YPreset current limit

YInternal thermal shutdown

YOperates with input-output voltage differential down to

YExcellent ripple rejection

YLow temperature drift

YEasily adjustable to higher output voltage

LM120 Series Packages and Power Capability

Rated Design

Device Package Power Load

Dissipation Current

LM120/LM320 TO-3 (K) 20W 1.5A

TO-39 (H) 2W 0.5A

LM320 TO-220 (T) 15W 1.5A

LM320M TO-202 (P) 7.5W 0.5A

Typical Applications

Dual Trimmed Supply

TL/H/7767–3

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.

²Required 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.

C1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

b5 Volt Regulators (Note 3)

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, Input-Output Voltage Differential 25V

please contact the National Semiconductor Sales Junction Temperatures See Note 1

Office/Distributors for availability and specifications. Storage Temperature Range b65§Ctoa

150§C

(Note 5) Lead Temperature (Soldering, 10 sec.) 300§C

Power Dissipation Internally Limited Plastic 260§C

Input Voltage b25V

Electrical Characteristics

Metal Can Package Power Plastic Package

Order Numbers LM120K-5.0 LM320K-5.0 LM120H-5.0 LM320H-5.0 LM320T-5.0

(TO-3) (TO-3) (TO-39) (TO-39) (TO-220) Units

Design Output Current (ID) 1.5A 1.5A 0.5A 0.5A 1.5A

Device Dissipation (PD) 20W 20W 2W 2W 15W

Parameter Conditions (Note 1) Min Typ Max Min Typ Max Min Typ Max Min Typ Max Min Typ Max

Output Voltage TJe25§C, VIN e10V, b5.1 b5b4.9 b5.2 b5b4.8 b5.1 b5b4.9 b5.2 b5b4.8 b5.2 b5b4.8 V

ILOAD e5mA

Line Regulation TJe25§C, ILOAD e5 mA, 10 25 10 40 10 25 10 40 10 40 mV

VMIN sVIN sVMAX

Input Voltage b25 b7b25 b7b25 b7bb25 b7b25 b7.5 V

Ripple Rejection f e120 Hz 54 64 54 64 54 64 54 64 54 64 dB

Load Regulation, TJe25§C, VIN e10V, 50 75 60 100 30 50 30 50 50 100 mV

(Note 2) 5 mA sILOAD sID

Output Voltage, b7.5V sVIN sVMAX,b5.20 b4.80 b5.25 b4.75 b5.20 b4.80 b5.25 b4.75 b5.25 b4.75 V

(Note 1) 5 mA sILOAD sID,PsP

Quiescent Current VMIN sVIN sVMAX 12 12 12 12 1 mA

Quiescent Current TJe25§C

Change VMIN sVIN sVMAX 0.1 0.4 0.1 0.4 0.05 0.4 0.05 0.4 0.1 0.4 mA

5mAsI

LOAD sID0.1 0.4 0.1 0.4 0.04 0.4 0.04 0.4 0.1 0.4 mA

Output Noise Voltage TAe25§C, CLe1mF, ILe5 mA, 150 150 150 150 150 mV

VIN e10V, 10 Hz sfs100 kHz

Long Term Stability 5 50 5 50 5 50 5 50 10 mV

Thermal Resistance

Junction to Case 3 3 Note 4 Note 4 4 §C/W

Junction to Ambient 35 35 Note 4 Note 4 50 §C/W

Note 1: This specification applies over b55§CsTJsa150§C for the LM120 and 0§CsTJsa125§C for the LM320.

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 up to PD.

Note 3: For b5V 3 amp regulators, see LM145 data sheet.

Note 4: Thermal resistance of typically 85§C/W (in 400 linear feet air flow), 224§C/W (in static air) junction to ambient, of typically 21§C/W junction to case.

Note 5: Refer to RETS120-5H drawing for LM120H-5.0 or RETS120-5K drawing for LM120-5K military specifications.

b12 Volt Regulators

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, Input-Output Voltage Differential 30V

please contact the National Semiconductor Sales Junction Temperatures See Note 1

Office/Distributors for availability and specifications. Storage Temperature Range b65§Ctoa

150§C

(Note 4) Lead Temperature (Soldering, 10 sec.) 300§C

Power Dissipation Internally Limited

Input Voltage b35V

Electrical Characteristics

Metal Can Package Power Plastic Package

Order Numbers LM120K-12 LM320K-12 LM120H-12 LM320H-12 LM320T-12

(TO-3) (TO-3) (TO-39) (TO-39) (TO-220) Units

Design Output Current (ID) 1A 1A 0.2A 0.2A 1A

Device Dissipation (PD) 20W 20W 2W 2W 15W

Parameter Conditions (Note 1) Min Typ Max Min Typ Max Min Typ Max Min Typ Max Min Typ Max

Output Voltage TJe25§C, VIN e17V, b12.3 b12 b11.7 b12.4 b12 b11.6 b12.3 b12 b11.7 b12.4 b12 b11.6 b12.4 b12 b11.6 V

ILOAD e5mA

Line Regulation TJe25§C, ILOAD e5 mA, 4 10 4 20 4 10 4 20 4 20 mV

VMIN sVIN sVMAX

Input Voltage b32 b14 b32 b14 b32 b14 b32 b14 b32 b14.5 V

Ripple Rejection f e120 Hz 56 80 56 80 56 80 56 80 56 80 dB

Load Regulation, TJe25§C, VIN e17V, 30 80 30 80 10 25 10 40 30 80 mV

(Note 2) 5 mA sILOAD sID

Output Voltage, 14.5V sVIN sVMAX,b12.5 b11.5 b12.6 b11.4 b12.5 b11.5 b12.6 b11.4 b12.6 b11.4 V

(Note 1) 5 mA sILOAD sID,PsP

Quiescent Current VMIN sVIN sVMAX 24 24 24 24 2 4 mA

Quiescent Current TJe25§C

Change VMIN sVIN sVMAX 0.1 0.4 0.1 0.4 0.05 0.4 0.05 0.4 0.1 0.4 mA

5mAsI

LOAD sID0.1 0.4 0.1 0.4 0.03 0.4 0.03 0.4 0.1 0.4 mA

Output Noise Voltage TAe25§C, CLe1mF, ILe5 mA, 400 400 400 400 400 mV

VIN e17V, 10 Hz sfs100 kHz

Long Term Stability 12 120 12 120 12 120 12 120 24 mV

Thermal Resistance

Junction to Case 3 3 Note 3 Note 3 4 §C/W

Junction to Ambient 35 35 Note 3 Note 3 50 §C/W

Note 1: This specification applies over b55§CsTJsa150§C for the LM120 and 0§CsTJsa125§C for the LM320.

Note 3: Thermal resistance of typically 85§C/W (in 400 linear feet/min air flow), 224§C/W (in static air) junction to ambient, of typically 21§C/W junction to case.

Note 4: Refer to RETS120H-12 drawing for LM120H-12 or RETS120-12K drawing for LM120K-12 military specifications.

b15 Volt Regulators

Absolute Maximum Ratings

If Military/Aerospace specified devices are required, Input-Output Voltage Differential 30V

please contact the National Semiconductor Sales Junction Temperatures See Note 1

Office/Distributors for availability and specifications. Storage Temperature Range b65§Ctoa

150§C

(Note 4) Lead Temperature (Soldering, 10 sec.) 300§C

Power Dissipation Internally Limited

Input Voltage

LM120/LM320 b40V

LM320T b35V

Electrical Characteristics

Metal Can Package Power Plastic Package

Order Numbers LM120K-15 LM320K-15 LM120H-15 LM320H-15 LM320T-15

(TO-3) (TO-3) (TO-39) (TO-39) (TO-220) Units

Design Output Current (ID) 1A 1A 0.2A 0.2A 1A

Device Dissipation (PD) 20W 20W 2W 2W 15W

Parameter Conditions (Note 1) Min Typ Max Min Typ Max Min Typ Max Min Typ Max Min Typ Max

Output Voltage TJe25§C, VIN e20V, b15.3 b15 b14.7 b15.4 b15 b14.6 b15.3 b15 b14.7 b15.4 b15 b14.6 b15.5 b15 b14.5 V

ILOAD e5mA

Line Regulation TJe25§C, ILOAD e5 mA, 5 10 5 20 5 10 5 20 5 20 mV

VMIN sVIN sVMAX

Input Voltage b35 b17 b35 b17 b35 b17 b35 b17 b35 b17.5 V

Ripple Rejection f e120 Hz 56 80 56 80 56 80 56 80 56 80 dB

Load Regulation, TJe25§C, VIN e20V, 30 80 30 80 10 25 10 40 30 80 mV

(Note 2) 5 mA sILOAD sID

Output Voltage, 17.5V sVIN sVMAX,b15.5 b14.5 b15.6 b14.4 b15.5 b14.5 b15.6 b14.4 b15.7 b14.3 V

(Note 1) 5 mA sILOAD sID,PsP

Quiescent Current VMIN sVIN sVMAX 24 24 24 24 2 4 mA

Quiescent Current TJe25§C

Change VMIN sVIN sVMAX 0.1 0.4 0.1 0.4 0.05 0.4 0.05 0.4 0.1 0.4 mA

5mAsI

LOAD sID0.1 0.4 0.1 0.4 0.03 0.4 0.03 0.4 0.1 0.4 mA

Output Noise Voltage TAe25§C, CLe1mF, ILe5 mA, 400 400 400 400 400 mV

VIN e20V, 10 Hz sfs100 kHz

Long Term Stability 15 150 15 150 15 150 15 150 30 mV

Thermal Resistance

Junction to Case 3 3 Note 3 Note 3 4 §C/W

Junction to Ambient 35 35 Note 3 Note 3 50 §C/W

Note 1: This specification applies over b55§CsTJsa150§C for the LM120 and 0§CsTJsa125§C for the LM320.

Note 3: Thermal resistance of typically 85§C/W (in 400 linear feet/min air flow), 224§C/W (in static air) junction to ambient, of typically 21§C/W junction to case.

Note 4: Refer to RETS120-15H drawing for LM120H-15 or RETS120-15K drawing for LM120K-15 military specifications.

Typical Performance Characteristics

Temperature

Output Voltage vs

(All Types)

Ripple Rejection

and TO-220 Packages

Output Impedance TO-3

and TO-202 Packages

Output Impedance TO-5

TO-220 Packages

Differential TO-3 and

Minimum Input-Output

TO-202 Packages

Differential TO-5 and

Minimum Input-Output

Input Voltage

Quiescent Current vs

Load Current

Quiescent Current vs

Dissipation (TO-3)

Maximum Average Power

TL/H/7767–4

*These curves for LM120.

Derate 25§C further for LM320.

Typical Performance Characteristics (Continued)

Dissipation (TO-5)

Maximum Average Power

Dissipation (TO-202)

Maximum Average Power

Dissipation (TO-220)

Maximum Average Power

Short Circuit Current

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%

²Determines Zener current.

²²Solid tantalum.

An LM120-12 or LM120-15 may be used to permit higher input voltages, but the regulated output voltage must be at least b15V when using the LM120-12 and

b18V for the LM120-15.

**Select resistors to set output voltage. 2 ppm/§C tracking suggested.

Typical Applications (Continued)

Wide Range Tracking Regulator

TL/H/7767–7

*Resistor tolerance of R1 and R2 determine matching of (a) and (b)

inputs.

**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/7767–9

*Optional. Improves transient response and ripple rejection.

VOUT eVSET

R1aR2

SELECT R2 AS FOLLOWS:

LM120-5 b300X

LM120-12 b750X

LM120-15 b1k

Current Source

*IOUT e1mAa5.0V

TL/H/7767–8

g15V, 1 Amp Tracking Regulators

TL/H/7767–12

Performance (Typical)

Load Regulation at DILe1A 10 mV 1 mV

Output Ripple, CIN e3000 mF, ILe1A 100 mVrms 100 mVrms

Temperature Stability a50 mV a50 mV

Output Noise 10 Hz sfs10 kHz 150 mVrms 150 mVrms

*Resistor tolerance of R4 and R5 determine matching of (a) and

(b) outputs.

**Necessary only if raw supply filter capacitors are more than 2×

from regulators.

Light Controllers Using Silicon Photo Cells

TL/H/7767–10

*Lamp brightness increases until iIe5V/R1 (iIcan be set as low as 1 mA).

²Necessary only of raw supply filter capacitor is more than 2×from

LM320MP.

TL/H/7767–11

*Lamp brightness increases until iIeiQ(1 mA) a5V/R1.

²Necessary only if raw supply filter capacitor is more than 2×from LM320.

Connection Diagrams

TL/H/7767–13

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

TL/H/7767–14

Bottom View

Steel Metal Can Package TO-3 (K)

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

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

b5V

TL/H/7767–18

Schematic Diagrams (Continued)

b12V and b15V

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

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

Physical Dimensions inches (millimeters) (Continued)

Power Package TO-202 (P)

Order Number LM320MP-5.0, LM320MP-12 or LM320MP-15

NS Package Number P03A

LM120/LM320 Series 3-Terminal Negative Regulators

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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