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TMC4670 Datasheet PRELIMINARY • IC Version V0.99 | Document Revision V0.91 • 2016-Nov-09
Figure 16: BBM Timing
Measured BBM times at MOS-FET gates differs 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 small BBM times cause electrical short of the MOS-FET bridges - so called
shoot through - that shorts the power supply and might damage the power stage
and the power supply.
3.8.6 Space Vector PWM (SVPWM)
A single bit controls the internal Space vector PWM (SVPWM) enable. No further setting are required for
the space vector PWM - just ON or OFF. The power on default for the SVPM is OFF.
Note
The SVPWM is for 3-phase motors only. For 2-phase motors there is no SVPWM.
4 Safety Functions
Different safety functions are integrated and mapped to status bits. Two programmable mask register
select those bits for WARNING or ERROR. Warning just indicated the warning status at the WARNING
output. An Error will cause programmable actions on error conditions and indicate the error status directly
at ERROR output, as PWM = OFF on over current condition or ADC raw values with permanent zero or ADC
raw values at maximum, . . .
Programmable autonomous error handling is not implemented yet.
Info
Internal hardware limiters for real time clipping and monitoring of interim values are available. LIMIT or
LIMITS is part of register names of registers associated to internal limiters. Please refer 5.
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