High Performance Stepper Motor Drive Circuit


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PDIP (N) 16 181 mm² 19.3 x 9.4 open-in-new Find other Stepper motor drivers


  • Full-Step, Half-Step and Micro-Step Capability
  • Bipolar Output Current up to 2A
  • Wide Range of Motor Supply Voltage: 10\x9650V
  • Low Saturation Voltage
  • Wide Range of Current Control: 5mA\x962A
  • Current Levels Selected in Steps or Varied Continuously
  • Thermal Protection and Soft Intervention
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The UC3770A and UC3770B are high-performance full bridge drivers that offer higher current and lower saturation voltage than the UC3717 and the UC3770. Included in these devices are LS-TTL compatible logic inputs, current sense, monostable, thermal shutdown, and a power H-bridge output stage. Two UC3770As or UC3770Bs and a few external components form a complete micro-processor-controllable stepper motor power system.

Unlike the UC3717, the UC3770A and the UC3770B require external high-side clamp diodes. The UC3770A and UC3770B are identical in all regards except for the current sense thresholds. Thresholds for the UC3770A are identical to those of the older UC3717 permitting drop-in replacement in applications where high-side diodes are not required. Thresholds for the UC3770B are tailored for half stepping applications where 50%, 71%, and 100% current levels are desirable.

The UC3770A and UC3770B are specified for operation from 0°C to 70°C ambient.

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Technical documentation

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Type Title Date
* Datasheet High Performance Stepper Motor Drive Circuit datasheet (Rev. A) Feb. 18, 2000
Technical articles Drive unipolar stepper motors as bipolar stepper motors with a simple wiring reconfiguration Apr. 09, 2020
Technical articles How stepper motors improve noise and efficiency in automotive system design Nov. 19, 2019
Technical articles Getting smart about tuning your stepper motor Aug. 23, 2018
Technical articles The story of motor-drive integration Jan. 09, 2017

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