µPD16814

8

NOTES ON PWM DRIVING CONTROL

Keep in mind the following points when executing PWM.

• Be sure to input the signals to control PWM driving from IN2 and IN4.

• Because the logic of the PWM driving control inputs (IN2 and IN4) to create the Brake status is inverted depending

on whether the Forward or Reverse mode is used, care must be exercised when PWM driving is controlled at

a duty factor other than 50%.

Example 1 PWM driving in Forward mode

IN1/IN3

IN2/IN4

FB FB FB FB FB F

Correct

IN1/IN3

IN2/IN4

FB FB FB FB FB F

Incorrect

Example 2 PWM driving in Reverse mode

IN1/IN3

IN2/IN4

RB RB RB RB RB R

Correct

IN1/IN3

IN2/IN4

RB RB RB RB RB R

Incorrect

Remark

This is because noise may be output due to the configuration of the internal circuit.