M63154AFP

Rev.1.0, Sep.16.2003, page 14 of 15

Timing Chart of Voltages on Individual Pins in PWM Control

Hw+

Hw-

Hv-

Hv+

Hu+

Hu-

Hall input

voltage

OSCC output

voltage

U

V

W

Output voltage

Output current

U

V

W

The current from the RS pin is detected at the FLT pin. This current reaching a value specified by the voltage on the

VCTL pin indicates full discharge. After charging, the voltage on the OSCC pin (pin 23) sets the off-period for PWM

current-chopping control.

Whenever a Hall input switches polarity, the voltage on the OSCC pin is temporarily reset to 0 V. While the voltage on

the OSCC pin is 0.9 V or less, the PWM waveforms are off (regenerative operation). Otherwise, PWM waveforms are

on.

The above timing chart shows the timing with which outputs for the motor are switched on and off during PWM

control. Timing for the switching of outputs in response to Hall input varies with the setting of the B1 pin.