The UDN2916B, UDN2916EB, and UDN2916LB motor drivers are
designed to drive both windings of a bipolar stepper motor or
bidirectionally control two dc motors. Both bridges are capable of
sustaining 45 V and include internal pulse-width modulation (PWM)
control of the output current to 750 mA. The outputs have been
optimized for a low output saturation voltage drop (less than 1.8 V
total source plus sink at 500 mA).
For PWM current control, the maximum output current is determined
by the user’s selection of a reference voltage and sensing
resistor. Two logic-level inputs select output current limits of 0, 33,
67, or 100% of the maximum level. A PHASE input to each bridge
determines load current direction.
The bridges include both ground clamp and flyback diodes for
protection against inductive transients. Internally generated delays
prevent cross-over currents when switching current direction. Special
power-up sequencing is not required. Thermal protection circuitry
disables the outputs if the chip temperature exceeds safe operating
limits.
The UDN2916B is supplied in a 24-pin dual in-line plastic batwing
package with a copper lead-frame and heat sinkable tabs for improved
power dissipation capabilities. The UDN2916EB is supplied in a 44-
lead power PLCC for surface mount applications. The UDN2916LB is
supplied in a 24-lead surface-mountable SOIC. Their batwing construction
provides for maximum package power dissipation in the
smallest possible construction. The UDN2916B/EB/LB are available for
operation from -40°C to +85°C. To order, change the prefix from 'UDN'
to 'UDQ'. These devices are also available on special order for operation
to +105°C.