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DATASHEET PDF7060.pdf
¡öGeneral Description                                          

Combining low-power CMOS logic with high-current, high-voltage

power FET outputs, the Series SLA706xM translator/drivers provide

complete control and drive for a two-phase unipolar stepper motor

with internal fixed off time and pulse-width modulation (PWM)

control of the output current in a power multi-chip module

(PMCM™).

There are no phase-sequence tables, high-frequency control lines,

orcomplex interfaces to program.The CMOS logic section provides

the sequencing logic, direction,control, synchronous/asynchronous

PWM operation, and a "sleep"function. The minimum CLOCK input

is an ideal fit for applications where a complex µP is unavailable or

overburdened. TTL or LSTTL may require the use of appropriate

pull-up resistors to ensure a proper input-logic high. For PWM current

control, the maximum output current is determined by the user's

selection of a reference voltage and sensing resistor. The NMOS

outputs are capable of sinking up to 1, 2, or 3 A (depending on device)

and withstanding 46 V in the off state.

Clamp diodes provide protection against inductive transients. Special

power-up sequencing is not required.

Half-, quarter-, eighth-, and sixteenth-step operation are externally

selectable for the SLA7060/61/62M. Full-, Half-, quarter-, and

eighth-step operation are externally selectable for the

SLA7065/66/67M.

Half-step excitation alternates between the one-phase and two-phase

modes (A-AB-B-AB-A-AB-BAB),providing an eight-step sequence