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TEA3717
STEPPER MOTOR DRIVER
TEA3717July 2003
STEPPER MOTOR DRIVER HALF-STEP AND FULL-STEP MODE. BIPOLAR DRIVE OF STEPPER MOTOR FOR
MAXIMUM MOTOR PERFORMANCE. BUILT-IN PROTECTION DIODES. WIDE RANGE OF CURRENT CONTROL 5 TO
1000 mA. WIDE VOLTAGE RANGE 10 TO 45 V. DESIGNED FOR UNSTABILIZED MOTOR
SUPPLY VOLTAGE. CURRENT LEVELS CAN BE SELECTED IN
STEPS OR VARIED CONTINUOUSLY
DESCRIPTIONThe TEA3717 is a bipolar monolithic integrated cir-
cuit intended to control and drive the current in one
winding of a bipolar stepper motor. The circuit con-
sists of an LS-TTL compatible logic input, a current
sensor, a monostable and an output stage with built-
in protection diodes. Two TEA3717 and a few exter-
nal components form a complete control and drive
unit for LS-TTL or microprocessor-controlled step-
per motor systems.
PIN CONNECTION (top view)1/8
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
SCHEMATIC DIAGRAM
RECOMMENDED OPERATING CONDITIONS
TEA37172/8
ELECTRICAL CHARACTERISTICSVCC = 5V, ±5%, Vmm = + 10V to + 40V, Tamb = 0o C to + 70o C (unless otherwise specified)
Figure 2.Figure 1 (see note)
TEA37173/8
FUNCTIONAL DESCRIPTIONThe circuit is intented to drive a bipolar constant cur-
rent through one motor winding. The constant cur-
rent is generated through switch mode regulation.
There is a choice of three different current levels with
the two logic inputs l0 and l1. The current can also
be switched off completely.
INPUT LOGICIf any of the logic inputs is left open, the circuit will
treat it as a high level input.
PHASE − This input determines the direction of cur-
rent flow in the winding, depending on the motor
connections. The signal is fed through a Schmidt-
trigger for noise immunity, and through a time delay
in order to guarantee that no short-circuit occurs in
the output stage during phase-shift. High level on
the PHASE-input causes the motor current flow
from MA through the winding to MB.
l0 and l1 − The current level in the motor winding is
selected with these inputs. The values of the differ-
ent current levels are determined by the reference
voltage VR together with the value of the sensing re-
sistor RS.
CURRENT SENSORThis part contains a current sensing resistor (RS), a
low pass filter (RC, CC) and three comparators. Only
one comparator is active at a time. It is activated by
the input logic according to the current level chosen
with signals l0 and l1. The motor current flows
through the sensing resistor RS. When the current
has increased so that the voltage across RS be-
comes higher than the reference voltage on the
other comparator input, the comparator output goes
high, which triggers the pulse generator and its out-
put goes high during a fixed pulse time (toff), thus
switching off the power feed to the motor winding,
and causing the motor current to decrease during
toff.
SINGLE-PULSE GENERATORThe pulse generator is a monostable triggered on
the positive going edge of the comparator output.
The monostable output is high during the pulse time,
toff, which is determined by the timing components
Rt and Ct.
toff = 0.69 ⋅R t Ct The single pulse switches off the power feed to the
motor winding, causing the winding current to de-
crease during toff.
If a new trigger signal should occur during toff, it is
ignored.
OUTPUT STAGEThe output stage contains four Darlington transis-
tors and four diodes, connected in an H-bridge. The
two sinking transistors are used to switch the pow-
ersupplied to the motor winding, thus driving a con-
stant current through the winding.
It should be noted however, that it is not permitted
to short circuit the outputs.
VCC, Vmm, VR
The circuit will stand any order of turn-on or turn-off
of the supply voltages VSS and VS. Normal dV/dt
values are then assumed.
Preferably, VR should be tracking VCC during power-
on and power-off.
ANALOG CONTROLThe current levels can be varied continuously either
if VR is varied or with a circuit varying the voltage fed
into the comparator terminal (see fig.1).
Note :RS = 1 Ω, inductance free = 1 kΩ = 820 pF, ceramic = 56 kΩ
TEA37174/8
Figure 3
Figure 4 : Typical Sink Saturation Voltage versus
Output Current
Figure 5 : Typical Source Saturation Voltage ver-
sus Output Current
Figure 6 : Typical Power Losses versus
Output Current
TEA37175/8
TYPICAL APPLICATION
Figure 7 : Serial Printer Carriage Drive.
Figure 8 : Principal Operating Sequence.
TEA37176/8
