TMC4671 Datasheet • IC Version V1.00 | Document Revision V1.04 • 2018-Dec-11
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4.10.4 PWM Modes
The power-on reset (POR) default of the PWM is OFF. The standard PWM scheme is the centered PWM.
Passive braking and freewheeling modes are available on demand. Please refer to section 6 concerning
the settings.
The PWM modes might be changed in a future version of the chip to support
so-called two-switch modulation or flat-bottom modulation.
Info
4.10.5 Break-Before-Make (BBM)
One register controls BBM time for the high side, another register controls BBM time for the low side. The
BBM times are programmable in 10 ns steps. The BBM time can be set to zero for gate drivers that have
their own integrated BBM timers.
Figure 31: BBM Timing
Measured BBM times at MOS-FET gates differ from programmed BBM times due
to driver delays and possible additional gate driver BBM times. The programmed
BBM times are for the digital control signals.
Info
Note
Too short BBM times cause electrical shortcuts of the MOS-FET bridges - so called
shoot through - that short the power supply and might damage the power stage
and the power supply.
BBM time registers might be changed in a future version of this chip to support
longer BBM times then 2.55 us.
Info
4.10.6 Space Vector PWM (SVPWM)
Note
The Space Vector PWM does not allow higher voltage utilization. This will be fixed
in next version of the chip.
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