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PDF UDN2916A Data sheet ( Hoja de datos )
| Número de pieza | UDN2916A | |
| Descripción | STEPPER MOTOR DRIVER | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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UDN2916A
ABLE 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
DESCRIPTION
The 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.
BLOCK DIAGRAM
STEPPER MOTOR DRIVER
ADVANCE DATA
Powerdip 20+2+2
ORDERING NUMBER: UDN2916A
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.
November 1991
ThAdvanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1/8
1 page  
Figure 2: Principle Operating Sequence
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 Stage
The 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
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet UDN2916A.PDF ] | |
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