UC3717A
Stepper Motor Drive Circuit
FEATURES
• Full-Step, Half-Step and Micro-Step Capability
• Bipolar Output Current...
UC3717A
Stepper Motor Drive Circuit
FEATURES
Full-Step, Half-Step and Micro-Step Capability
Bipolar Output Current up to 1A
Wide Range of Motor Supply
Voltage 10-46V
Low Saturation
Voltage with Integrated Bootstrap
Built-In Fast Recovery Commutating Diodes
Current Levels Selected in Steps or Varied Continuously
Thermal Protection with Soft Intervention
DESCRIPTION
The UC3717A is an improved version of the UC3717, used to switch drive the current in one winding of a bipolar stepper motor. The UC3717A has been modified to supply higher winding current, more reliable thermal protection, and improved efficiency by providing integrated bootstrap circuitry to lower recirculation saturation
voltages. The diagram shown below presents the building blocks of the UC3717A. Included are an LS-TTL compatible logic input, a current sensor, a monostable, a thermal shutdown network, and an H-bridge output stage. The output stage features built-in fast recovery commutating diodes and integrated bootstrap pull up. Two UC3717As and a few external components form a complete control and drive unit for LS-TTL or micro-processor controlled stepper motor systems.
The UC3717A is characterized for operation over the temperature range of 0°C to +70°C.
ABSOLUTE MAXIMUM RATINGS (Note 1)
Voltage Logic Supply, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V Output Supply, Vm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50V
Inp...