SGS Thomson Microelectronics L2750 Datasheet

HIGHOUTPUTCURRENT
VERYLOWSATURATION VOLTAGE
LOW VOLTAGEOPERATION
LOW INPUT OFFSETVOLTAGE
GND COMPATIBLEINPUTS
ST-BYFUNCTION (LOW CONSUMPTION)
HIGHAPPLICATIONFLEXIBILITY

L2750

DUAL LOW DROP HIGH POWER

OPERATIONAL AMPLIFIER

ADVANCE DATA

PROTECTIONS:

VERYINDUCTIVE LOADS
OVERRATINGCHIP TEMPERATURE
LOADDUMP VOLTAGE
FORTUITOUS OPEN GROUND
ESD

DESCRIPTION

The L2750 is a new technology class AB dual
power operational amplifier assembled in Multi­watt 11 package.

Thanks to the fully complementaryPNP/NPN out­put configurationthe L2750 can deliver a rail-to-

BLOCK DIAGRAM

Multiwatt-11

ORDERING NUMBER: L2750

rail output voltage swing even at the highest cur­rent.

Additional feature is the very low current Stand­By function.

Thehigh applicationflexibility of the L2750 makes
the device suitable for either motor driving/control
and audioapplicationspurposes.

October1991

This is advanced information on a new productnow in development or undergoing evaluation. Details are subject to change without notice.

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L2750

PIN CONNECTION (Top view)

ABSOLUTE MAXIMUMRATINGS

Symbol Parameter Value Unit

V

Sop

V

S max

V

PEAK

V
V
I

O

I

O

P

tot

T

stg,Tj

Operating Supply Voltage 18 V
Supply Voltage 28 V
Peak Supply Voltage (t = 50ms) 40 V
Input Voltage V

i

Differential Input Voltage V

i

Sop
Sop

Output Peak Current(non rep.t = 100µs) 5 A
Output Peak Current (rep. f > 10Hz) 4 A
Power Dissipation T

=85°C36W

CASE

Storage and JunctionTemperature -40 to 150 °C

V
V

THERMAL DATA

Symbol Description Value Unit

R

th j-case

Thermal Resistance Junction-case Max 1.8 °C/W

ELECTRICAL CHARACTERISTICS (Refer to the operational amplifier with GV= 24dB; VS= 14.4V;
T

=25°C,unless otherwisespecified

amb

Symbol Parameter Test Condition Min. Typ. Max. Unit

V

S

I

d

V

OS

I

SB

I

S

I

OS

V

DROP

SR Slew Rate 4 V/µs

B Gain Bandwidth Prod 10 MHz

G

V

R

IN

E

IN

CMRR Common Mode Rejection Ratio 75 90 dB

Supply Voltage 4 18 V
Total Quiescent Drain Current 30 50 mA
Input Offset Voltage 5 mV
ST-BY Current Consumption 50 µA
Input Bias Current 0.5 µA
Input Offset Current 50 nA
Output Voltage Drop (High) IO= 0.5A

I

=3A

O

Output Voltage Drop (Low) I

O

I

O

= 0.5A
=3A

0.25

1.1

0.25
1

0.5

2.5

0.5
2

V
V

V
V

Open Loop Voltage Gain f = 1KHz 85 dB
Input Resistance 150 MΩ
Input Noise Voltage Rs= 0 to10KΩ f = 22Hzto 22KHz 3 µV

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ELECTRICALCHARACTERISTICS (continued)

Symbol Parameter Test Condition Min. Typ. Max. Unit

SVR Supply Voltage Rejection R

C

T

Crosstalk f = 1KHz to 10KHz 80 dB

=0

s

f = 100Hz

75 90 dB

L2750

APPLICATIONSUGGESTION

The high flexibilitymakes the L2750 suitable for a
wide range of applications.

Motor Controller

The device can be utilized as a motor controller.
Fig.1 represents a bidirectional DC motor control
suitablefor logic driving. In thesekinds of applica­tion it is possible to take advantage of the high
current capability of the L2750 for driving several
types of low impedance motors in a broad range
of applications.Moreover the low dropallows high
start up currents even at lowest supplyvoltage.

Audio Applications

Another typical utilization of the L2750 concerns
the audio field, as follows:

1) DRIVER FOR BOOSTER: The remarkably low
distortionand noise makesthedeviceproperto
be used as high quality driver for main amplifi­ers (i.e. car radio boosters). An example is
shownby Fig. 5, where thegainis setto 24 dB
(see alsothe relevantcharacteristics).

2) CAR RADIO BOOSTERWITH DIFFERENTIAL
INPUT : Fig. 10 shows an exampleof carradio
booster, with a gain of 30 dB, that is specially
recommendedfor active loudspeakers.Among
itsmain featureis the differentialinputand sub­sequent high noise suppression. The typical
output power delivered into a 4Ω load is 24W

=14.4V;d =10%),as shownby thecharac-

(V

S

teristicsenclosed.

Figure2: Low Drop Voltage vs. Output Current

Figure3: High Drop Voltagevs. Output Current

Figure1

Figure4: Open Loop Gain vs. PhaseResponse

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L2750

Figure5: Stereo Audio Amplifier ApplicationCircuit

Figure6: P.C. Board and ComponentsLayout of the Circuit of Figure 5 (1:1 scale)

4/10

AUDIO STEREOAPPLICATION CIRCUIT OF FIGURE 5

L2750

Figure7: QuiescentDrain Currentvs. Supply

Voltage

Figure9: Distortion vs. Frequency

Figure8: Distortionvs. Output Voltage

Figure10: Cross-Talkvs Frequency

Figure11:SupplyVoltageRejectionvs.Frequency

Figure12: E

Inputvs. R

N

g

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L2750

Figure13: BridgePower Amplifier with BalancedInput Application Circuit

Figure14: P.C. Board and ComponentLayout of the Circuit ofFigure13 (1:1 scale)

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BRIDGEAUDIO APPLICATION CIRCUIT OF FIGURE 13

L2750

Figure15: QuiescentDrain Current vs. Supply

Voltage

Figure17: OutputPower vs. Supply Voltage

Figure16: Noisevs. R

S

Figure18: OutputPower vs SupplyVoltage

Figure19: Distortionvs. OutputPower

Figure20: Distortionvs. Output Power

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L2750

Figure21: Distortionvs. OutputPower

Figure23: Distortionvs. Frequency

Figure22: Distortionvs. Output Power

Figure24: SupplyVoltage Rejection vs. Fre-

quency

Figure25: TotalPower Dissipationand Effi-

ciencyvs. OutputPower

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Figure26: TotalPower Dissipationand Effi-

ciencyvs. OutputPower

MULTIWATT11 PACKAGE MECHANICAL DATA

L2750

DIM.

A 5 0.197
B 2.65 0.104
C 1.6 0.063
D 1 0.039
E 0.49 0.55 0.019 0.022
F 0.88 0.95 0.035 0.037

G 1.57 1.7 1.83 0.062 0.067 0.072
G1 16.87 17 17.13 0.664 0.669 0.674
H1 19.6 0.772
H2 20.2 0.795

L 21.5 22.3 0.846 0.878
L1 21.4 22.2 0.843 0.874
L2 17.4 18.1 0.685 0.713
L3 17.25 17.5 17.75 0.679 0.689 0.699
L4 10.3 10.7 10.9 0.406 0.421 0.429
L7 2.65 2.9 0.104 0.114

M 4.1 4.3 4.5 0.161 0.169 0.177

M1 4.88 5.08 5.3 0.192 0.200 0.209

S 1.9 2.6 0.075 0.102
S1 1.9 2.6 0.075 0.102

Dia1 3.65 3.85 0.144 0.152

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

mm inch

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L2750

Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibilityfor the
consequences of use of such information nor for any infringement ofpatents or otherrights 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 thispublication are subject to change without notice. This publication supersedes and replaces all informationpreviously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in lifesupport devices or systems without ex­press writtenapproval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics - All RightsReserved

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