Datasheet PBL3717A Datasheet (SGS Thomson Microelectronics)

.FULL STEP - HALF STEP - QUARTER STEP

OPERATINGMODE

.BIPOLAROUTPUTCURRENT UP TO 1 A

.FROM 10 V UP TO 46 V MOTOR SUPPLY

VOLTAGE

.LOW SATURATION VOLTAGE WITH INTE-

GRATED BOOTSTRAP

.BUILTIN FASTPROTECTIONDIODES

.EXTERNALLY SELECTABLE CURRENT

LEVEL

.OUTPUT CURRENT LEVEL DIGITALLY OR

ANALOGUECONTROLLED

.THERMALPROTECTIONWITHSOFT INTER-

VENTION

PBL3717A

STEPPER MOTOR DRIVER

Powerdip 12 + 2 + 2

(PlasticPackage)

ORDER CODE : PBL3717A

DESCRIP TION

ThePBL3717AisamonolithicICwhichcontrolsand
drives one phase of a bipolar stepper motor with
choppercontrolofthe phasecurrent.Currentlevels
maybeselectedinthreestepsbymeansoftwologic
inputswhich select one of threecurrent compara­tors.Whenbothof theseinputsare highthe device
isdisabled.Aseparatelogicinputcontrolsthedirec­tionof current flow.

A monostable,programmedby an externalRC net­work,sets the currentdecaytime.

Thepower sectionisa full H-bridge driver with four
internal clamp diodes for current recirculation. An
externalconnectiontotheloweremittersisavailable
for the insertion of a sensing resistor. Two
PBL3717Asand few external componentsform a
completesteppermotor drive subsystem.

The raccomendedoperating ambient temperature
rangesis from 0 to 70 °C.

ThePBL3717Aissuppliedina12+2+ 2leadPow­erdippackage.

April1993

PIN CONNECTI ON (top view)

1/11

PBL3717A

PIN FUNCTIONS

N° Name Function

1 UTPUT B Output Connection (with pin 15). The outputstage is a ”H” bridge formed by four

2 PULSE TIME A parallel RC network connected to this pin sets the OFF time of the lower power

3 SUPPLY VOLTAGE B Supply Voltage Input for Half Output Stage

4 GROUND Ground Connection. With pins 5, 12 and 13 also conducts heat from die to

5 GROUND See pin 4.
6 LOGIC SUPPLY Supply Voltage Input for Logic Circuitry
7 INPUT 1 This pin and pin 9 (INPUT 0) are logic inputs which select the outputs of the

8 PHASE This TTL-compatible logic input sets the directionof current flow through the

9 INPUT 0 See INPUT 1 (pin 7) .

10 COMPARATOR

INPUT

11 REFERENCE A voltage applied to this pin sets thereference voltage of the three comparators,

12 GROUND See pin 4.
13 GROUND See pin 4.
14 SUPPLY VOLTAGE A Supply Voltage Input for Half Output Stage. See also pin 13.
15 OUTPUT A See pin 1.
16 SENSE RESISTOR Connection to Lower Emitters of Output Stage for Insertion of Current Sense

transistors and four diodes suitable for switching applications.

transistors. The pulse generator is a monostable triggered by the rising edge of
the output of the comparators (t

= 0.69 RTCT).

off

See also pin 14.

printed circuit copper.

three comparators to set the current level. Current also depends on the sensing
resistor and reference voltage. See truth table.

load. A high level causes current to flow from OUTPUT A (source) to OUTPUT
B (sink). A schmitt trigger on this input provides good noise immunity and a delay
circuit prevents output stage short circuits during switching.

Input connected to the three comparators. The voltage across the sense resistor
is feedback to thisinput through the low pass filter R
transistor are disabled when the sense voltage exceeds the reference voltage of

. The lower power

CCC

the selected comparator. When this occursthe current decays for a time set by
R

TCT,toff

this determining the output current(also thus depending on R
INPUT 0 and INPUT 1).

= 0.69 RTCT.

and the two inputs

s

Resistor

TRUTH TABLE

Input 0 (pin 9) Input 1 (pin 7)

H

L

H

L

2/11

H
H

L
L

No Current
Low Current
Medium Current
High Current

BLOCK DIAGRAM

PBL3717A

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

s

V

ss

V

V

c

V

r

I

o

T

stg

T

j

Power Supply Voltage 50 V
Logic Supply Voltage 7 V
Logic Input Voltage 6 V

i

Comparator Input V

ss

Reference Input Voltage 15 V
Output Current (DC operation) 1.2 A
Storage Temperature – 55 to + 150 °C
Operating Junction Temperature 150 °C

THERMAL DATA

Symbol Parameter Value Unit

R

th j-case

R

th j-amb

*

Solderedon a 35µ thick 20cm

Thermal Resistance Junction-pins 11 °C/W
Thermal Resistance Junction-ambient* 40 °C/W

2

P.C.board copper area.

3/11

PBL3717A

ELECTRICAL CHARACTERISTICS

(refer to the test circuit V

= 36V, VSS= 5V, T

S

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

I

Supply Voltage (pin 3, 14) 10 46 V

s

Logic Supply Voltage (pin 6) 4.75 5.25 V

ss

Logic Supply Current (pin 6) 7 15 mA

ss

Reference InputCurrent (pin 11) VR= 5V 0.75 1 mA

I

R

LOGIC INPUTS

V

V

I

Input Low Voltage (pins 7, 8, 9) 0.8 V

iL

Input High Voltage (pin 7, 8, 9) 2 V

iH

Low Voltage Input Current (pins 7, 8, 9) Vi= 0.4V pin 8

I

iL

High Voltage Input Current (pins 7, 8, 9) Vi= 2.4V 10 µA

iH

COMPARATORS

V

V

V

t

I

Comparator Low Threshold Voltage (pin 10) VR=5V Io=L

CL

Comparator Medium Threshold Voltage (pin 10) VR=5V Io=L

CM

Comparator High Threshold Voltage (pin 10) VR=5V Io=L

CH

I

Comparator Input Current (pin 10) ± 20 µA

C

Cutoff Time RT= 56kΩ CT= 820pF 25 35 µs

off

Turn Off Delay (see fig. 2) 2 µs

t

d

Output Leakage Current (pins 1, 15) Io=H I1= H 100 µA

off

SOURCE DIODE-TRANSISTOR PAIR

V

V

I

I

V

SLK

Saturation Voltage (pins 1, 15) IM= – 0.5A (see fig. 2)

sat

Saturation Voltage (pins 1, 15) IM= – 1A (see fig. 2)

sat

Leakage Current Vs= 46 V 300 µA

LK

Diode Forward Voltage IM= – 0.5A

F

Substrate Leakage Current when Clamped IM= – 0.5A

SINK DIODE-TRANSISTOR PAIR

V

I

V

Saturation Voltage (pins 1, 15) IM= 0.5A

sat

Leakage Current Vs= 46V 300 µA

LK

Diode Forward Voltage IM= 0.5A

F

=25oC unless otherwise specified)

amb

pins 7, 9

=H

I

1

=H

I

1

=H

I

1

Conduction Period
Recirculation Period

Conduction Period
Recirculation Period

=–1A

I

M

=–1A

I

M

=1A

I

M

=1A

I

M

ss

– 100
– 400µAµA

66 78 90 mV

236 251 266 mV

396 416 436 mV

1.7

2.1

1.1

1.35

2.1

2.8

1.7

2.5

1

1.25

1.3

1.7
25mA

1.1

1.35

1.6

2.3

1.1

1.5

1.4

2

V

V

V

V
V

mA

V
V

V
V

4/11

Figure 1 : Test and ApplicationCircuit

Figure 2 : WaveformswithMA Regulating(phase= 0)

PBL3717A

5/11

PBL3717A

Figure 3 : TwoPhaseBipolarStepperMotor Driver

Figure 4 : P.C. Board and ComponentLayout of the Circuit of fig. 3 (1 : 1 scale)

6/11

Figure 5 : Inputand OutputSequencesfor Half Stepand FullStep Operation

PBL3717A

APPLIC ATI O N INFO RMATIO NS

Figure 3 shows a typical application in which two
PBL3717Acontrolatwo phasebipolarsteppermo­tor.

Programming

ThelogicinputsI

andI1setat threedifferentlevels

0

the amplitude of the current flowing in the motor
windingaccordingtothetruthtableofpage2.Ahigh
levelon the ”PHASE” logic input sets the direction
ofthatcurrentfromoutputA to outputB; a lowlevel
from outputB to outputA.

It is recommended that unused inputs are tied to
pin 6 (V

) or pin 4 (GND) as appropriateto avoid

ss

noiseproblem.
The current levels can be varied continuously by

changingthe ref.voltageon pin 11.

Control ofthe Motor

Thesteppermotorcanrotateineitherdirectionsac­cording to the sequenceof the input signals. It is
possibletoobtaina fullstep, a half step anda quar­ter step operation.

Full StepOperation

Both the windings of the stepper motor are ener­gizedall the time withthe same current I

I

andI1remainfixedat whatevertorquevalueisre-

0

MA=IMB

.

quired.
Calling A the conditionwith winding A energizedin

one direction and A in the other direction, the se­quencefor fullstep rotation is :

AB → AB → AB → ABetc.

Forthe rotationin the otherdirection the sequence
must be reserved.
Inthefullstepoperationthetorqueisconstanteach
step.

HalfStep Operation

Power is applied alternately to one winding then
bothaccording to the sequence:

AB → B → AB → A → AB → B → AB → Aetc.

Likefull step thiscan be doneat anycurrentlevel;
the torqueis not constantbut it is lowerwhen only
one windingis energized.

A coilis turnedoff bysetting I

and I1bothhigh.

0

7/11

PBL3717A

QuarterStep Operation

It ispreferable to realizethe quarterstep operation
at full power otherwise the steps will be of very ir­regularsize.

Theextraquarterstepsare addedto the half steps
sequencebyputtingonecoilonhalf currentaccord­ingto the sequence.

A

AB →

B → B →

2

__

A

B→ AB → A

2

B

→ A etc.

2

MotorSelection

As the PBL3717Aprovides constantcurrent drive,
withaswitchingoperation,caremustbetakentose­lect stepper motors with low hysteresis losses to
preventmotorover heat.

Figure6 : SourceSaturationVoltageversus

OutputCurrent (recircuitperiod)

L -C Filter

To reduce EMI and choppinglossesin themotora
lowpass L -C filter can be inserted acrossthe out­putsofthePBL3717Aasshownonthefollowingpic­ture.

−10

L ≈

1

10

LM C ≈

⋅ 10

4

L

Figure7 : SourceSaturationVoltageversus

OutputCurrent(conductionperiod)

Figure8 : Sink SaturationVoltageversus

OutputCurrent

8/11

Figure9 : ComparatorThreshold versus

JunctionTemperature

PBL3717A

MOUNTINGINSTRUCTIONS

The R

of the PBL 3717A can be reduced by

th j-amb

solderingthe GNDpinsto asuitablecopperareaof
the printedcircuit board or to an external heatsink.

Figure10 : Exampleof P.C. BoardCopper Area

whichis usedas Heatsink

Thediagramoffig. 11showsthemaximumdissipa­ble power P

andthe R

tot

as a functionof the

th j-amb

side”α” oftwo equal squarecopperareashaving a
thichknessof35µ (seefig. 10).

Figure11 : Max.Dissipable Power andJunction-

AmbientThermalResistanceversus
size ”a”

9/11

PBL3717A

POWERDIP16 PACKAGE MECHANICAL DATA

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

10/11

PBL3717A

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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11/11