SGS-THOMSON L6506, L6506D Technical data

查询L6506供应商

CURRENTCONTROLLERFOR STEPPING MOTORS

DESCRI P TI ON

The L6506/Dis a linearintegratedcircuit designed
to senseand controlthecurrentinsteppingmotors
and similardevices.Whenusedin conjunctionwith
the L293, L298, L7150,L6114/L6115,the chip set
formsa constantcurrentdrive foran inductiveload
andperformsalltheinterfacefunctionfromthe con­trol logic thruthe powerstage.

Two or more devices may be synchronized using
thesyncpin.In thismodeof operationtheoscillator
in themasterchipsetstheoperatingfrequencyinall
chips.

L6506

L6506D

DIP18 SO20

ORDERING NUMBERS:

L6506 L6506D

BLOCK DIAGRAM (pin’s number referred to DIP-18)

June 1997

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L6506 -L6506D

PI N CONNE CTI ONS (top view)

DIP18 SO20

ABSOLUTEMAXIMUM RATINGS

Symbol Parameter Val u e Uni t

V

V

P

T

T

Supply Voltage 10 V

CC

Input Signals 7 V

i

Total Power Dissipation(T

tot

=70°C) for DIP18

amb

Total Power Dissipation(Tamb =70ÉC) for SO20

JunctionTemperature 150

j

Storage Temperature -40 to 150

stg

1

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THERMAL DATA

Symb o l Parameter DIP 18 SO 20 Uni t

R

thj-amb

ELECTRICAL CHARACTERESTICS (VCC= 5.0V,T

Thermal ResistanceJunction-ambient Max. 80 100

=25°C; unlessotherwisenoted)

amb

C/W

°

Symb o l Parameter Test Cond itions Mi n . Typ . Max. Unit

V

I

SupplyVoltage 4.5 7 V

CC

QuiescentSupplyCurrent VCC=7V 25 mA

CC

COMPARATOR SECTION

Symb o l Parameter Test Cond itions Mi n . Typ . Max. Unit

V

V

I

I

Input Voltage Range V

IN

Input Offset Voltage VIN= 1.4V

IO

Input Offset Current

IO

Input Bias Current 1 µ

IB

Response time V

Inputs –0.3 3 V

sense

±5.0

±200

REF

= 1.4V V

= 0 to 5V 0.8 1.5

SENS

W
W

C

°
°C

mV

nA

µ

A

s

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L65 06 - L6506D

ELECTRICAL CHARACTERISTICS(continued)
COMPARATOR SECTIONPERFORMANCE(OverOperatingTemperatureRange)

Symbol Parameter Test Condtions Min. Typ. Max. Unit

V

Input Offset Voltage VIN= 1.4V

IO

Input Offset Curent

I

IO

±

±

500

20

mV

nA

LOGICSECTION

Symbol Parameter Test Condtions Min. Typ. Max. Unit

V

V

V

Input High Voltage 2 V

IH

Input Low Voltage 0.8 V

V

IL

Output High Voltage VCC= 4.75V

OH

Ouptut Low Voltage VCC= 4.75V

OL

Ouput Source Current - Outputs

I

OH

1-4

(OverOperatingTemperatureRange -TTL compatibleinputs& outputs)

2 3.5 V

= 400µA

I

OH

0.25 0.4 V

= 4mA

I

OH

VCC= 4.75V 2.75 mA

s

OSCILLATOR

Symbol Parameter Test Condtions Min. Typ. Max. Unit

f
V

V

Frequency Range 5 70 KHz

osc

Lower Threshold Voltage 0.33 V

thL

Higher Threshold Voltage 0.66 V

thH

Internal Discharge Resistor 0.7 1 1.3

R

i

CC
CC

CIRCUIT OP ERATION

TheL6506isintendedfor use withdual bridgedriv­ers,suchasthe L298,quaddarlingtonarrays,such
as the L7150, quad DMOS array such as L6114­L6115,ordiscretepowertransistorstodrivestepper
motorsandothersimilarloads.Themainfunctionof
thedeviceistosenseandcontrolthecurrentineach
of theload windings.

Acommonon-chiposcillatordrivesthedualchopper
andsetsthe operatingfrequencyforthepulsewidth
modulateddrive.The RCnetworkon pin1 setsthe
operatingfrequencywhichis givenby the equation
:

f = forR > 10 K

1

0.69 RC

The oscillator provides pulses to set the two flip­flopswhichin turncausethe outputsto activatethe
drive.Whenthecurrentintheloadwindingreaches
theprogrammedpeakvalue,thevoltageacrossthe
senseresistor (R

) is equal to V

sense

and the cor-

ref

respondingcomparatorresetsits flip-flopinterrupt­ingthedrivecurrentuntilthenextoscillatorpulseoc­curs. The peak current in each winding is pro­grammedby selectingthe valueofthe senseresis-

tor and V

. Sinceseparateinputsare providedfor

ref

each chopper, each of the loads may be pro­grammed independentlyallowing the device to be
used to implement microstepping of the motor.
LowerthresholdofL6506’soscillatoris 1/3V
per thresholdis 2/3 V

sistoris 1 KΩ ±

30%.

and internal dischargere-

CC

CC

Ground noise problems in multiple configurations
can be avoided by synchronizing the oscillators.
This may be done by connecting the sync pins of
eachof the deviceswith the oscillatoroutput of the
masterdeviceandconnectingtheR/Cpinoftheun­usedoscillatorsto ground.

Theequationsfor the activetime of thesync pulse
(T2),the inactivetimeof thesyncsignal(T1)andthe
dutycyclecanbefoundbylookingatthefigure1 and
are:

R1R

T2 = 0.69C1 (1)

R1 + R

IN

IN

T1 = 0.69 R1C1 (2)
DC= (3)

T2

T1 + T2

V

V
V

kΩ

.Up-

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L6506 -L6506D

By substituting equations1 and 2 into equation 3
and solving for the value of R1 the followingequa­tionsfor theexternal componentscan bederived :

R1 = ( –2) R

1

DC

C1 = (5)

0.69R1

IN

T1

(4)

Figure1 : OscillatorCircuitandWaveforms.

Lookingat equation1 itcan easilybe seen thatthe
minimumpulsewidthof T2willoccurwhenthevalue
of R1 is at its minimum and the valueof R1 at its
maximum. Therefore, when evaluatingequation 4
the minimum value for R1 of 700Ω (1KΩ –30%)
should be used to guarantee the required pulse
width.

APPL ICATI ONS INFO RMATION

Thecircuits shown infigure2 use theL6506 toim­plementconstantcurrentdrivesforsteppermotors.
Figure 2 shows the L6506 used with the L298 to
drivea 2 phasebipolarmotor. Thepeakcurrentcan
be calculatedusingthe equation:

V

I

peak

ref

=

R

sense

The circuit of Fig.2 can be used in applicationsre­quiring different peak and hold current values by
modifyingthe referencevoltage.

TheL6506maybeusedtoimplementeitherfullstep
or half step drives. In the case of 2 phase bipolar
stepper motor applications, if a half step drive is
used,thebridge requiresan additionalinput todis­ablethe power stageduringthe half step.Ifusedin
conjunctionwith the L298the enableinputsmaybe
usedfor this purpose.

Forquad darlingtonarrayin 4 phaseunipolarmotor
applications half step may be implemented using
the 4 phaseinputs.

The L6506 may also be used to implement mi­crosteppingof either bipolaror unipolarmotors.

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L65 06 - L6506D

Figure2 : ApplicationCircuit BipolarStepperMotorDriver.(pin’s numberreferredto DIP18)

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L6506 -L6506D

DIP18PACKAGE MECHANICAL DATA

DIM.

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

a1 0.254 0.010

B 1.39 1.65 0.055 0.065

b 0.46 0.018

b1 0.25 0.010

D 23.24 0.915

E 8.5 0.335

e 2.54 0.100

e3 20.32 0.800

F 7.1 0.280

I 3.93 0.155

L 3.3 0.130

Z 1.27 1.59 0.050 0.063

mm inch

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SO20PACKAGEMECHANICAL DATA

L65 06 - L6506D

DIM.

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

A 2.65 0.104
a1 0.1 0.3 0.004 0.012
a2 2.45 0.096

b 0.35 0.49 0.014 0.019
b1 0.23 0.32 0.009 0.013

C 0.5 0.020
c1 45 (typ.)

D 12.6 13.0 0.496 0.512

E 10 10.65 0.394 0.419

e 1.27 0.050
e3 11.43 0.450

F 7.4 7.6 0.291 0.299

L 0.5 1.27 0.020 0.050

M 0.75 0.030

S 8 (max.)

mm inch

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L6506 -L6506D

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. Specification
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
withoutexpress written approval of SGS-THOMSON Microelectronics.

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 1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved

SGS-THOMSON Microelectronics GROUP OF COMPANIES

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