Chapter 9
16-bit Timer
IX - 60 IGBT Output with Dead Time
IGBT output waveform with dead time (at the falling edge setting):
(A) Until the IGBT output is valid from the IGBT trigger input, the TM7IO and TM8IO are:
TM7IO = "Low", TM8IO = "Low".
(B) TM7IO rises after the time, that is one count clock + count clock × "the dead time preset register 1 + 1"
from the rising edge of the next count clock of the IGBT trigger input, elapses.
(C) TM7IO falls at the next count clock from the compare match between the binary counter and TM7OC2.
(D) TM8IO rises after the time, that is count clock × "the dead time preset register 2 + 1", elapses.
(E) TM8IO falls at the next count clock from the compare match between the binary counter and TM7OC1.
(F) TM7IO rises after the time, that is count clock × "the dead time preset register 1 + 1", elapses since
TM8IO falls.
(G) As soon as the IGBT trigger is invalid, the TM7IO and TM8IO are: TM7IO = "Low", TM8IO = "Low".
..
When using the IGBT output with dead time, set the values of TM7OC1 and 2 as follow:
TM7OC2 ≤ TM7OC1
If TMnOC2 > TMnOC1, the IGBT output are at the falling edge setting:
TM7IO = fixed to "Low", TM8IO = fixed to "Low".
..
..
If the IGBT trigger is enabled before 2 count clock cycles elapsed after the IGBT trigger is
disabled, the preset register data set during the IGBT operation may not be loaded to the
compare register or the dead time preset register data set during the IGBT operation may not
be reflected.
..
..
If the event input is selected as a count clock source, the preset register data set during the
IGBT operation may not be loaded to the compare register or the dead time preset register
data set during the IGBT operation may not be reflected.
..
..
If the event input is selected as a count clock source, the dead time preset register data may
not be reflected even if it is set when the IGBT operation is disabled. To prevent this, select
the system clock (SYSCLK) as a count clock source at first and set the data to the dead time
preset register. Then, select the event input (TM7IO) as a clock source to start IGBT opera-
tion.
..
..
When selecting IRQ0, 1 or 2 as an IGBT trigger, the IGBT operation may start at most one
count clock before and after the usual start.
..
To Next Page
Loading...
