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EN1 m o .c U 4 t e e h S a at .D w w w SENSE 1 PHASE 1 VREF 1 ENABLE 1 2 91 7 DUAL FULL-BRIDGE PWM MOTOR DRIVER The UDN2917EB motor driver is designed to drive both windings of a bipolar steppe r motor or bidirectionally control two dc motors. Both bridges are capable of sustaining 45 V and include internal pu lse-width modulation (PWM) control of t he output current to 1.5 A. For PWM cur rent control, the maximum output curren t is determined by the user’s selecti on of a reference voltage and sensing r esistor. Two logic-level inputs select output current limits of 0, 33%, 67%, o r 100% of the maximum level. A PHASE in put to each bridge determines load curr ent direction. Active-low ENABLE inputs control the four drivers in each bridg e. The bridges include both ground clam p and flyback diodes for protection aga inst inductive transients. Internally g enerated delays prevent cross-over curr ents when switching current direction. Special power-up sequencing is not required. Thermal protection c