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UDN2916A
STEPPER MOTOR DRIVER
UDN2916ASTEPPER MOTOR DRIVER
ADVANCE DATAABLE TO DRIVE BOTH WINDINGS OF BIPO-
LAR STEPPER MOTOR
OUTPUT CURRENT UP TO 750mA EACH
WINDING
WIDE VOLTAGE RANGE 10V TO 50V
HALF-STEP, FULL-STEP AND MICROSTEPP-
ING MODE
BUILT-IN PROTECTION DIODES
INTERNAL PWM CURRENT CONTROL
LOW OUTPUT SATURATION VOLTAGE
DESIGNED FOR UNSTABILIZED MOTOR
SUPPLY VOLTAGE
INTERNAL THERMAL SHUTDOWN
DESCRIPTIONThe UDN2916A is a bipolar monolithic integrated
circuits intended to control and drive both winding
of a bipolar stepper motor or bidirectionally con-
trol two DC motors.
The UDN2916A with a few external components
form a complete control and drive circuit for LS-
TTL or microprocessor controlled stepper motor
system.
The power stage is a dual full bridge capable of
sustaining 50V and including four diodes for cur-
rent recirculation.
A cross conduction protection is provided to avoid
simultaneous cross conduction during switching
current direction.
An internal pulse-width-modulation (PWM) con-
trols the output current to 750mA with peak start-
up current up to 1A.
Wide range of current control from 750mA (each
bridge) is permitted by means of two logic inputs
and an external voltage reference. A phase input
to each bridge determines the load current direc-
tion.
A thermal protection circuitry disables the outputs
if the chip temperature exceeds safe operating
limits.
BLOCK DIAGRAM
PIN FUNCTIONS
PIN CONNECTION (Top view)
UDN2916A
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS (Tamb = 25°C, Ttab ≤ 70°C, VS = 50V, VSS = 4.75V to 5.25V, VREF = 5V; unless otherwise specified) See fig. 3.
OUTPUT DRIVERS (OUTA or OUTB)
CONTROL LOGIC
COMPARATORS
UDN2916A
FUNCTIONAL DESCRIPTIONThe circuit is intended to drive both windings of a
bipolar stepper motor.
The peak current control is generated through
switch mode regulation.
There is a choice of three different current levels
with the two logic inputs I01 - I11 for winding 1 and
I02 - I12 for winding 2.
The current can also be switched off completely
Input Logic (I0 and I1)The current level in the motor winding is selected
with these inputs. (See fig. 2)
If any of the logic inputs is left open, the circuit will
treat it has a high level input.
PhaseThis input determines the direction of current flow
in the windings, depending on the motor connec-
tions. 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 Out A through the winding to
Out B
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 acti-
vated by the input logic according to the current
level chosen with signals Io and I1.
The motor current flows through the sensing re-
sistor RS.
When the current has increased so that the volt-
age across RS becomes higher than the refer-
ence voltage on the other comparator input, the
comparator goes high, which triggers the pulse
generator.
The max peak current Imax can be defined by:
Imax = Vref
10 Rs
Single-pulse Generator
Figure 1
ELECTRICAL CHARACTERISTICS (Continued)PROTECTION
UDN2916A
The 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 time compo-
nents Rt and Ct.
toff = 1.1 • RtCt
The single pulse switches off the power feed to
the motor winding, causing the winding current to
decrease during toff.
If a new trigger signal should occur during toff, it is
ignored.
Output StageThe output stage contains four Darlington transis-
tors (source drivers) four saturated transistors
(sink drivers) and eight diodes, connected in two
H bridge.
The source transistors are used to switch the
power supplied to the motor winding, thus driving
a constant current through the winding.
It should be noted however, that is not permitted
to short circuit the outputs.
Internal circuitry is added in order to increse the
accuracy of the motor current particularly with low
current levels.
VS, VSS, VRef
Figure 2: Principle Operating Sequence
UDN2916A
