Datasheet TEA3717DP Datasheet (SGS Thomson Microelectronics)

.HALF-STEPAND FULL-STEPMODE

.BIPOLARDRIVE OF STEPPERMOTOR FOR

MAXIMUM MOTORPERFORMANCE

.BUILT-IN PROTECTIONDIODES

.WIDERANGE OF CURRENTCONTROL 5 TO

1000mA

.WIDEVOLTAGERANGE10 TO 45 V

.DESIGNED FOR UNSTABILIZED MOTOR

SUPPLYVOLTAGE

.CURRENT LEVELS CAN BE SELECTED IN

STEPSOR VARIEDCONTINUOUSLY

DESCRIP TION

TheTEA3717is a bipolarmonolithicintegratedcir­cuitintendedto controland drive the current in one
windingof a bipolarsteppermotor.The circuitcon­sistsof an LS-TTLcompatiblelogic input, a current
sensor,amonostableandanoutputstagewithbuilt­inprotectiondiodes.Two TEA3717andafewexter­nal componentsform a completecontroland drive
unitfor LS-TTLor microprocessor-controlled step­per motorsystems.

TEA3717

STEPPER MOTOR DRIVER

POWERDIP 1 2 + 2 + 2

ORDER CODE : TEA 3717D P

PIN CONNECTION (top view)

April1993

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TEA3717

SCHEMATIC DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

mm

V

CC

Power Supply Voltage (pins 14, 3) 45 V
Logic Supply Voltage (pin 6) 7 V
Input Voltage

V

in

V

in

V

V

Logic Inputs
Analog Inputs
Reference Input

– 0.5 to 6

V

CC

15

Input Current

I

in

I

in

I

O

T

j

T

stg

T

oper

Logic Inputs
Analog Inputs

–10

–10
Output Current ± 1A
Junction Temperature + 150 °C
Storage Temperature Range – 55 to + 150 °C
Operating Ambiant Temperature Range 0 to + 70 °C

THERMAL DATA

Symbol Parameter Value Unit

R

th (j-c)

R

th (j-a)

*

Solderedon a 35 mm thick 20 cm

Maximum Junction-pins Thermal Resistance 11 °C/W
Maximum Junction-ambient Thermal Resistance 45* °C/W

3

PC board copperarea

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min. Typ. Max. Unit

V

CC

V

mm

I

o

T

amb

t

r

t

f

Supply Voltage 4.75 5 5.25 V
Supply Voltage 10 – 40 V
Output Current 0.020 – 0.8 A
Ambient Temperature 0 – 70 °C
Rise Time, Logic Inputs – – 2 µs
Fall Time, Logic Inputs – – 2 µs

V

mA

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TEA3717

ELECTRICAL CHARACTERISTICS

= 5V, ±5%, Vmm= + 10V to + 40V, T

V

CC

Symbol Parameter Min. Typ. Max. Unit

I
V
V

I
I

V
V

V

I

I

V

P

t

Supply Current – – 25 mA

CC

High Level Input Voltage - Logic Inputs 2.0 – – V

IH

Low Level Input Voltage - Logic Inputs – – 0.8 V

IL

High Level Input Current - Logic Input (VI= + 2.4V) – – 20 µA

IH

Low Level Input Current - Logic Inputs (VI= + 0.4V) – 0.4 – – mA

IL

Comparator Threshold Voltage (VR= + 5.0V), I0=0,I1=0

CH
CM

CL

Comparator Input Current – 20 – 20 µA

CO

Output Leakage Current (I0=1,I1=1)

off

Total Saturation Voltage Drop (Io= 500mA) – – 4.0 V

sat

Total Power Dissipation

tot

Cut off Time (seefigure 1 and 2, Vmm= + 10V, ton≥ 5µs) 25 30 35 µs

off

Turn off Delay (see figure 1 and 2, T

t

d

=+25°C

T

amb

=+70°C, VS= 40V, VSS=5V

T

amb

= 500mA, fs= 30kHz

I

o

= 800mA, fs= 30kHz

I

o

=0oCto+70oC (unlessotherwisespecified)

amb

=1,I1=0

I

0

=0,I1=1

I

0

230

65

–
–

–
–

=+25°C, dVC/dt ≥ 50mV/µs) – 1.6 µs

amb

390

420
250

80

–

100

1.8

3.7

440
270

100
200

90

2.3
–

mV

µA

W

Figure2.Figure 1 (seenote)

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TEA3717

FUNCTIO NAL DE SCRIPTION

Thecircuitisintentedtodrivea bipolarconstantcur­rentthroughone motor winding. Theconstantcur­rentis generatedthroughswitch moderegulation.

Thereis achoiceofthreedifferentcurrentlevelswith
the two logic inputs l

and l1. The currentcan also

0

beswitchedoff completely.

INPUT LOGIC

If any of the logic inputs is leftopen, the circuit will
treatit as a highlevel input.

I

0

H

L

H

L

I

1

H

No Current

H

Low Current

L

Medium Current

L

Maximum Current

Current Level

PHASE− Thisinput determinesthedirectionofcur­rent flow in the winding, depending on the motor
connections.The signal is fed througha Schmidt­triggerfornoiseimmunity,andthrougha timedelay
in order to guaranteethat no short-circuitoccursin
the output stage during phase-shift.High level on
the PHASE-input causes the motor current flow
fromM

l

0

throughthewindingto MB.

A

andl1− Thecurrentlevel in the motor windingis
selectedwiththese inputs.The valuesof thediffer­ent currentlevels are determinedby the reference
voltageV
sistorR

togetherwiththevalueof the sensingre-

R

.

S

CURRENT SENS O R

Thispart containsa currentsensingresistor(R
lowpassfilter(R

)andthreecomparators.Only

C,CC

S

),a

one comparatorisactiveat atime. It is activatedby
theinput logicaccordingto thecurrentlevelchosen
with signals l
throughthe sensing resistor R
has increased so that the voltage across R

and l1. The motor current flows

0

. When the current

S

be-

S

comes higher than the reference voltage on the

othercomparatorinput,thecomparatoroutputgoes
high,whichtriggersthe pulsegeneratorandits out­put goes high during a fixed pulse time (t

), thus

off

switching off the powerfeed to the motor winding,
and causing the motor current to decrease during
t

off.

SINGLE-PULSE GENERATOR

The pulse generatoris a monostabletriggered on
the positive going edge of the comparatoroutput.
Themonostableoutputis highduringthepulsetime,
t

, whichis determinedby the timing components

off

and Ct.

R

t

=0.69⋅RtC

t

off

t

Thesinglepulseswitches off thepower feedto the
motor winding,causing the winding current to de­creaseduring t

If a new trigger signalshould occur during t

off

.

,itis

off

ignored.

OUTPUT STAGE

The output stage contains four Darlington transis­torsandfourdiodes,connectedinanH-bridge.The
two sinking transistorsare usedto switchthe pow­ersuppliedto themotorwinding,thus drivingacon­stantcurrent throughthe winding.

It should be noted however,that it is not permitted
to short circuitthe outputs.

V

CC,Vmm,VR

Thecircuit will standany orderof turn-onor turn-off
of the supply voltages V

and VS. Normal dV/dt

SS

valuesare thenassumed.
Preferably,V

shouldbetrackingVCCduringpower-

R

on and power-off.

ANALOG CONTRO L

Thecurrentlevelscan bevariedcontinuouslyeither

isvariedorwithacircuitvaryingthevoltagefed

ifV

R

intothecomparatorterminal(see fig.1).

Note : RS=1Ω, inductance free

R

=1kΩ

C

= 820pF, ceramic

C

C

=56kΩ

R

t

= 820pF, ceramic

C

t

4/8

Figure 3

TEA3717

Functionalblocks

A. TTL compatibleinput logic
B. Current sensor
C. Single-pulse generator (monostable)
D. Outputstage withprotection diodes.

Figure4 : Typical Sink SaturationVoltageversus

OutputCurrent

Figure6 : Typical Power Lossesversus

OutputCurrent

Figure5 : TypicalSource SaturationVoltagever-

sus OutputCurrent

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TEA3717

TYPICAL APPLICATION
Figure 7 : SerialPrinter CarriageDrive.

Figure 8 : PrincipalOperatingSequence.

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POWERDIP 16 PACKAGE MECHANICAL DATA

TEA3717

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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TEA3717

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 withoutexpress written approval of SGS-THOMSON Microelectronics.

 1994 SGS-THOMSON Microelectronics - All Rights Reserved

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