Datasheet L272M, L272D, L272 Datasheet (SGS Thomson Microelectronics)

DUAL POWER OPERATIONAL AMPLIFIERS

.OUTPUTCURRENT TO1 A

.OPERATESAT LOW VOLTAGES

.SINGLEOR SPLITSUPPLY

.LARGE COMMON-MODE AND DIFFEREN-

TIALMODERANGE

.GROUNDCOMPATIBLEINPUTS

.LOWSATURATIONVOLTAGE

.THERMAL SHUTDOWN

DESCRIP TION

TheL272 isa monolithic integratedcircuits in Pow­erdip,Minidipand SO packagesintendedfor useas
poweroperationalamplifiers in a wide rangeof ap­plicationsincludingservoamplifiersandpowersup­plies,compacts disc, VCR, etc.

Thehighgainand high outputpower capabilitypro­videsuperiorperformancewhateveranoperational
amplifier/powerboostercombinationisrequired.

L272

Powerdip

(8 +8)

Minidip

ORDERING NUMBERS : L272 (Powerdip)

SO16 (Narrow)

L272M (Minidip)
L272D (SO16 Narrow)

PIN CONNECTIONS (top view)

January 1995

L27 2M

L272D

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L272

BLOCK DIAGRAMS

L272 L272ML272D

SCHEMATIC DIAGRAM (oneonly)

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ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V
V

I

o

I

p

P

tot

T

op

T

stg,Tj

s

Supply Voltage 28 V
Input Voltage V

i

Differential Input Voltage ± V

i

s

s

DC Output Current 1 A
Peak Output Current (non repetitive) 1.5 A
Power Dissipation at:

=80°C (L272), T

T

amb

=75°C (L272)

T

case

=50°C (L272M), T

amb

=90°C (L272D)

case

1.2
5

Operating Temperature Range (L272D) – 40 to 85 °C
Storage and Junction Temperature – 40 to 150 °C

THERMAL DATA

Symbol Parameter Powerdip SO16 Minidip Unit

R

th j-case

R

th j-amb

R

th j-alumina

* Thermal resistance junction-pin 4
** Thermal resistance junctions-pins with the chip soldered on the middle of an alumina supporting substrate measuring

15x 20mm; 0.65mm thickness and infinite heatsink.

Thermal Resistance Junction-pins Max. 15 – * 70
Thermal Resistance Junction-ambient Max. 70 – 100
Thermal Resistance Junction-alumina Max. – ** 50 –

L272

W
W

o

C/W

o

C/W

o

C/W

ELECTRICAL CHARACTERISTICS (VS= 24V, T

=25oC unless otherwise specified)

amb

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

s

I

s

I

b

V

os

I

os

Supply Voltage 4 28 V

Quiescent Drain Current VO=

S

V

= 24V

V

s

= 12V

s

2

8

7.51211mAmA

V

Input Bias Current 0.3 2.5 µA
Input Offset Voltage 15 60 mV
Input Offset Current 50 250 nA

SR Slew Rate 1V/µs

B Gain-bandwidth Product 350 kHz
R
G

v

e

N

I

N

Input Resistance 500 kΩ

i

O. L. Voltage Gain f = 100Hz

60 70

f = 1kHz
Input Noise Voltage B = 20kHz 10 µV
Input Noise Current B= 20kHz 200 pA

50

dB
dB

CRR Common Mode Rejection f = 1kHz 60 75 dB
SVR Supply Voltage Rejection f = 100Hz, R

= 24V

V

s

= ± 12V

V

s

= ± 6V

V

s

V

o

C

s

Output Voltage Swing Ip= 0.1A

= 0.5A 212322.5

I

p

Channel Separation f = 1 kHz; RL=10Ω,Gv= 30dB

= 24V

V

s

= ± 6V

V

s

d Distortion f = 1kHz, G

T

sd

Thermal Shutdown Junction
Temperature

= 10kΩ,VR= 0.5V

G

547062

56

60
60

= 3 dB, Vs= 24V, RL= ∞ 0.5 %

v

145 °C

dB

V
V

dB

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L272

Figure 1 : QuiescentCurrent versus

SupplyVoltage

Figure2 : QuiescentDrain Current versus

Temperature

Figure 3 : OpenLoop VoltageGain Figure4 : OutputVoltageSwing versus

LoadCurrent

Figure 5 : OutputVoltageSwing versus

LoadCurrent

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Figure6 : SupplyVoltageRejectionversus

Frequency

L272

Figure 7 : ChannelSeparationversus

Figure8 : Common Mode Rejection versus

Frequency

APPLICATION SUGGESTION

NOTE
In orderto avoid possible instabilityoccuringinto fi­nalstagetheusualsuggestionsfor thelinearpower
stagesareuseful, as for instance :

- layoutaccuracy;

- a 100nFcapacitorcorrectedbetweensupplypins
and ground;

- boucherotcell(0.1 to0.2µF+1Ωseries)between
outputsand groundor acrossthe load.

Figure 9 : BidirectionalDC Motor Control with µPCompatible Inputs

Frequency

Figure 10 : Servocontrolfor Compact-disc

Figure 11 : CapstanMotorControlin VideoRecorders

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L272

Figure 12 : Motor CurrentControlCircuit.

Note : The input voltage level is compatible with L291 (5-BIT D/A converter).

Figure 13 : BidirectionalSpeedControl of DCMotors.

2R3°R1

For circuitstabilityensurethat R

Thevoltageavailableat the terminalsof themotor isV

> where RM=internalresistanceofmotor.

X

R

M

=2(Vi⋅ )+Ro ⋅ ΙMwhereRo =

M

and IMisthe motorcurrent.

V

s

2R

2R°R1

X

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POWERDIP 16 PACKAGE MECHANICAL DATA

L272

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

a1 0.51 0.020

B 0.85 1.40 0.033 0.055
b 0.50 0.020

b1 0.38 0.50 0.015 0.020

D 20.0 0.787
E 8.80 0.346
e 2.54 0.100

e3 17.78 0.700

F 7.10 0.280

I 5.10 0.201
L 3.30 0.130
Z 1.27 0.050

mm inch

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L272

MINIDIP PACKAGE MECHANICAL DATA

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 3.32 0.131

a1 0.51 0.020

B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022

b1 0.204 0.304 0.008 0.012

D 10.92 0.430
E 7.95 9.75 0.313 0.384
e 2.54 0.100

e3 7.62 0.300
e4 7.62 0.300

F 6.6 0.260

I 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060

mm inch

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SO16 NARROW PACKAGE MECHANICAL DATA

L272

DIM.

MIN. TYP. MAX. MIN. TYP. MAX.

A 1.75 0.069
a1 0.1 0.25 0.004 0.009
a2 1.6 0.063

b 0.35 0.46 0.014 0.018

b1 0.19 0.25 0.007 0.010

C 0.5 0.020

c1 45° (typ.)

D 9.8 10 0.386 0.394

E 5.8 6.2 0.228 0.244

e 1.27 0.050

e3 8.89 0.350

F 3.8 4.0 0.150 0.157
L 0.4 1.27 0.150 0.050

M 0.62 0.024

S8°(max.)

mm inch

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L272

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for
the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its
use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifica­tions mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information pre­viously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of SGS-THOMSON Microelectronics.

 1995 SGS-THOMSON Microelectronics - All Rights Reserved

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