STK672-010 Просмотр технического описания (PDF) - SANYO -> Panasonic

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STK672-010

Unipolar Fixed-Current Chopper (separate excitation) Type 1.7 A Output Current Stepping Motor Driver with Built-in 4-Phase Distribution Controller

SANYO -> Panasonic 

STK672-010

STK672-010 Operation

<Separate Excitation Chopper Driver Block Operation>

Fig. 1 STK672-010 Driver Block Basic Circuit

Figures 1 and 2 show the driver block basic circuit and the waveforms in the various blocks.

Unlike the earlier STK6710 Series, which adopted MOSFET transistors, the STK672-010 implements a fixed current

drive scheme with separate excitation.

When the FET is turned on by a high level input

on the øA signal in the driver block basic circuit,

the comparator + pin goes low and the comparator

output goes low. The L1 current ION that flows in

the FET at this time is given by the following

formula.

ION =

VCC1 – Vsat

R

(1

–

e–

R

L

t) .....................

(1)

L: Coil inductance

R: The sum of the coil resistance and Rs

Then, when the Rs voltage becomes equal to

Vref, the FET turns off. At this point the energy

stored in the inductor L1 induces a current in L2

and the current IOFF flows. The time that the

current IOFF flows is proportional to the off time

set at the oscillator.

Fig. 2 Waveform Timing Chart

Thus the chopping operation is partially fixed at the oscillator frequency by the latch function.

The STK672-010 repeats the operation of switching the motor current on and off, i.e., fixed current chopping operation,

as described above.

No. 4927-5/17

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