SGS Thomson Microelectronics TEA3718SFP, TEA3718SP, TEA3718SDP, TEA3718DP Datasheet
TEA3 718
TEA3718S
STEPPER MOTOR DRIVER
ADVANCE DATA
HALF-STEPAND FULL-STEPMODE
BIPOLARDRIVE OF STEPPERMOTOR FOR
MAXIMUM MOTORPERFORMANCE
BUILT-INPROTECTIONDIODES
WIDERANGEOF CURRENT CONTROL5 TO
1500mA
WIDEVOLTAGERANGE10 TO 50 V
DESIGNED FOR UNSTABILIZED MOTOR
SUPPLYVOLTAGE
CURRENT LEVELS CAN BE SELECTED IN
STEPSOR VARIEDCONTINUOUSLY
THERMALOVERLOADPROTECTION
ALARM OUTPUT OR PRE-ALARM OUTPUT
(seeinternaltable)
DESCRIP T IO N
TheTEA3718andTEA3718Sarebipolarmonolithic
integratedcircuitsintended to control and drive the
currentin one winding of a bipolar stepper motor.
The circuits consist of an LS-TTL compatiblelogic
input,a currentsensor,amonostableandanoutput
stagewith built-inprotectiondiodes.TwoTEA3718
or TEA3718Sand a few externalcomponentsform
a complete control and drive unit for LS-TTLor microprocessor-controlledsteppermotor systems.
Powerdip
12+2+2
ORDERINGNUMBERS :
TEA3718SDP
TEA3718DP
MULTIWATT-15
ORDERING NUMBER : TEA3718SP
SO-20
ORDERING NUMBER :
TEA3718SFP
PIN CONNECTI O NS (top views)
TEA3718SP
(Multiwa tt -1 5)
December 1991
Thisis advanced informationon a new product now in development or undergoing evaluation. Details are subject to change withoutnotice.
TEA3718SFP
(SO-20)
TEA3718DP
TEA3718SDP
(Powerdip 12+2+2)
1/16
TEA371 8-TEA 3718S
BLOCK DIAGRAM TEA3718S
BLOCK DIAGRAM TEA3718
2/16
TEA3718- TEA3718S
PIN FUNCTIONS
Name Function
OUT B Output Connection (with pin OUTA). The output stage is a ”H” bridge formed by four
transistors and four diodes suitable for switching applications.
PULSE TIME A parallel RC network connected to this pin sets the OFF time of the lower power
transistors. The pulse generator is a monostable triggered by the rising edge of the
output of the comparators (t
(B) Supply Voltage Input for Half Output Stage
V
S
GND Ground Connection. In SO-20L and Powerdip these pins also conduct heat from die
to printed circuit copper.
V
SS
Supply Voltage Input for Logic Circuitry
IN1 This pin and pin IN0 are logic inputs which select the outputs of three comparators to
set the current level. Current also depends on the sensing resistor and reference
voltage. See truth table.
PHASE This TTL-compatible logic input sets the direction of current flow through the load. A
high level causes current to flow from OUT A (source) to OUT B (sink). A Schmitt
trigger on this input provides good noise immunity and a delay circuit prevents output
stage short circuits during switching.
IN0 See INPUT 1
COMPARATOR INPUT Input connected to the three comparators. The voltage across the sense resistor is
feedback to this input through the low pass filter R
are disabled when the sense voltage exceeds the reference voltage of the selected
comparator. When this occurs the current decays for a time set by R
.
R
TCT
REFERENCE A voltage applied to this pin sets the reference voltage of the three comparators.
Reference voltage with the value of R
the output current.
(A) Supply voltage input for half output stage
V
S
OUT A See pin OUT B
SENSE RESISTOR Connection to lower emitters of output stage for insertion of current sense resistor
ALARM When T
PRE-ALARM When T
reaches T1°C the alarm output becomes low (TEA3718SP)
j
reaches T2°C the prealarm output becomes low (T2<T1) (TEA3718SFP)
j
= 0.69 RTCT).
off
. The lower power transistor
CCC
TCT,Toff
and the two inputs IN0 and IN1 determines
S
= 0.69
3/16
TEA371 8-TEA 3718S
ABSOLUTE MAXIMUM RATINGS
Symbol Parameters Value Unit
V
T
THERMAL DAT A
Symbol Parameter SO-20L Powerdip Multiwatt Unit
R
R
*
Solderedon a 35 µm thick4 cm
Supply Voltage 7
SS
V
S
Input Voltage:
V
I
Logic Inputs
Analog Inputs
Reference Input
Input Current
i
i
Logic Inputs
Analog Inputs
Output Current ±1.5 A
I
O
Junction Temperature +150 °C
T
J
Operating Ambient Temperature Range 0 to 70 °C
T
op
Storage Temperature Range -55 to +150 °C
stg
(j-c) Maximum Junction-case Thermal Resistance 16 11 3
th
(j-a) Maximum Junction-ambient Thermal Resistance 60 * 45 * 40
th
2
PC boardcopper area.
50
V
15
-10
-10
6
SS
°C/W
°C/W
V
V
V
V
V
mA
mA
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Min. Typ. Max. Unit
v
V
i
m
T
amb
t
t
Supply Voltage 4.75 5 5.25 V
ss
Supply Voltage 10 – 45 V
S
Output Current 0.020 – 1.2 A
Ambient Temperature 0 70 °C
Rise Time Logic Inputs – – 2 µs
r
Fall Time Logic Inputs – – 2 µs
f
COMPARISON TABLE
Device Curren t P ackag e Alarm Pre-Alarm
TEA3718SDP 1.5A Powerdip 12+2+2 not connected
TEA3718SFP 1.5A SO-20L x
TEA3718SP 1.5A Multiwatt-15 X
TEA3718DP 1.5A Powerdip 12+2+2 not connected
4/16
MAXIMUM POWER DISSIPATION
TEA3718- TEA3718S
Figure 1.
Figure 2.
RS=1 Ω INDUCTANCEFREE
R
= 470 Ω
C
C
= 820pF CERAMIC
C
R
=56kΩ
t
C
= 820 pF CERAMIC
t
P = 500 Ω
R
=1K
2
5/16
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