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Figure 5. Zero current input circuit

Figure 6. Disable input circuit

A - GS-D500A DESCRIPTION

The GS-D500A is a complete subsystem to drive

stepper motors either in full step or microstep mode.

A very large number of auxiliary functions has been

included to allow extreme simplicity and flexibility in

use.

Particular care has been devoted to protections, so

that the GS-D500A can be safely used in very harsh

environments.

In addition to the obvious function to drive the motor

phases in a chopping mode, the following functions

have been implemented:

-

Sine/cosine generation

-

Selection of three different microsteps/step rates

-

Selection of full/half step drive

-

Programming of peak phasecurrent to optimize

the torque

-

Automatic phase current reduction at rest (se-

lectable)

-

Full protection against short-circuit between

phase-to-phase and phase-to-ground

-

Thermal and undervoltage protection

-

Galvanic isolation of 3 input signals (clock,

direction, zero current).

-

Fault indication output

-

On board auxiliary voltages generation

-

Midrange stability circuitry (selectable)

As a result, the GS-D500A can provide up to 5A per

phase and, in its simplest application, just three

command signals are required: step clock, direc-

tion, disable.

GS-D500A