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 UC3717A features LS-TTL compatible logic input, a current sensor, a monostable, a thermal shutdown network, and an H-bridge output stage. 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 UNITRODE UC3717A is an improved stepper motor drive circuit designed to switch current in one winding of a bipolar stepper motor. It supports full-step, half-step, and micro-step capabilities with bipolar output currents up to 1A and operates over a motor supply voltage range of 10-46V. The device includes built-in fast recovery commutating diodes and an integrated bootstrap circuit to lower recirculation saturation voltages and improve efficiency.
The circuit incorporates an LS-TTL compatible logic input, a current sensor, a monostable timer, a thermal shutdown network, and an H-bridge output stage. Two UC3717A devices along with a few external components form a complete control and drive unit for LS-TTL or micro-processor controlled stepper motor systems. The device is characterized for operation over a temperature range of 0°C to +70°C.
| Output Current | ±1.2A |
|---|---|
| Motor Supply Voltage | 10-46V |
| Logic Supply Voltage | 4.75V to 5.25V |
| Operating Temperature Range | 0°C to +70°C |
| Junction Temperature | +150°C |
| Thermal Shutdown Temperature | +160°C to +180°C |
The maximum output current is ±1.2A.
The device is characterized for operation over the temperature range of 0°C to +70°C.
Yes, it has full-step, half-step, and micro-step capability.