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UPD16814

MONOLITHIC DUAL H BRIDGE DRIVER CIRCUIT

NEC => Renesas Technology 

µPD16814

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 FBFB FBFB F

Correct

Example 2 PWM driving in Reverse mode

IN1/IN3

IN2/IN4

FB FBFB FBFB F

Incorrect

IN1/IN3

IN1/IN3

IN2/IN4

RB RBRB RBRB R

IN2/IN4

RB RBRB RBRB R

Correct

Incorrect

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

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