资 源 简 介
ThePBL3717Ais amonolithic ICwhich controlsanddrives one phase of a bipolar stepper motor withchoppercontrolof the phase current. Current levelsmaybeselected in threestepsbymeans of two logicinputs which select one of three current comparators.When both of these inputs are high the deviceis disabled.A separatelogic input controls the direcTIonof current flow.A monostable,programmed by an externalRC network,sets the current decay TIme.The power secTIon is a full H-bridge driver with fourinternal clamp diodes for current recirculaTIon. Anexternalconnectionto theloweremitters isavailablefor the insertion of a sensing resistor. TwoPBL3717As and few external components form acomplete stepper motor drive subsystem.The raccomended operating ambient temperatureranges is from 0 to 70 °C.The PBL3717Ais supplied in a 12 + 2 + 2 lead Powerdippackage.
