TEA3718DP datasheet(12/16 Pages) STMICROELECTRONICS

12 / 16 page

MOTOR SELECTION

Some stepper motors are not designed for continu-

ous operation at maximum current. As the circuit

drives a constant current through the motor, its tem-

perature might increase exceedinglyboth at low and

high speed operation.

Also, some stepper motors have such high core

losses that they are not suited for switch mode cur-

rent regulation.

UNUSED INPUTS

Unused inputs shouldbe connectedto proper voltage

levels in order to get the highest noise immunity.

INTERFERENCE

As the circuit operates with switch mode current

regulation, interference generation problems might

arise in some applications. A good measure might

then be to decouple the circuit with a 15 nF ceramic

capacitor, located near the packagebetween power

line VS and ground.

The ground lead between RS,CC and circuit GND

should be kept as short as possible. This applies

also to the lead between the sensing resistor RS and

point S, see FUNCTIONAL BLOCKS.

APPLICATION NOTES

PRINCIPAL OPERATING SEQUENCE

TEA3718-TEA3718S

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TEA3718DP Datasheet(PDF) 12 Page - STMicroelectronics