UC3770B (ACTIVE)

High Performance Stepper Motor Drive Circuit

 

Recommended alternative parts

  • DRV8829  -  The DRV8829 provides better efficiency and a smaller package

Description

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.

Features

  • 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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Parametrics Compare all products in Motion/Motor Control

 
Operating Supply (Min) (V)
Operating Supply (Max) (V)
Operating Supply Current (mA)
Peak Output Current (A)
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
UC3770B
10   
45   
33   
1.5   
Current-Limited
Output Clamp Diodes
Stepper Motor Controllers
Switching Control
Thermal Shutdown   
Catalog   
0 to 70   
16PDIP