TB6568KQ
2017-04-14
6. PWM Control
Switching input through the IN1 and IN2 pins enables the PWM control of the motor driver.
When the motor drive is controlled by the PWM input, the TB6568KQ repeats operating in Normal
Operation mode and Short Brake mode alternately.
For preventing the shoot-through current in the output circuit caused by the upper and lower power
transistors being turned on simultaneously, the dead time is internally generated at the time the upper and
lower power transistors switches between on and off.
This eliminates the need of inserting Off time externally; thus the PWM control with synchronous
rectification is enabled.
Note that inserting Off time externally is not required on operation mode changes between CW and CCW,
and CW (CCW) and Short Brake, again, because of the dead time generated internally.
PWM ON
t5
PWM OFF
t3
PWM ON
t1
PWM ON → OFF
t2 = 200 ns (typ.)
PWM OFF → ON
t4 = 500 ns (typ.)
GND
VM
waveform
(OUT1)
t1
t2
t3
t4
