Datasheet

TMS320C28346, TMS320C28345, TMS320C28344

TMS320C28343, TMS320C28342, TMS320C28341

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SPRS516D –MARCH 2009–REVISED AUGUST 2012

4.4 High-Resolution PWM (HRPWM)

The HRPWM module offers PWM resolution (time granularity) which is significantly better than what can

be achieved using conventionally derived digital PWM methods. The key points for the HRPWM module

are:

• Significantly extends the time resolution capabilities of conventionally derived digital PWM

• Typically used when effective PWM resolution falls below ~ 9–10 bits. This occurs at PWM frequencies

greater than ~500 kHz when using a CPU/System clock of 300 MHz or ~375 kHz when using a

CPU/system clock of 200 MHz.

• This capability can be utilized in both duty cycle and phase-shift control methods.

• Finer time granularity control or edge positioning is controlled via extensions to the Compare A and

Phase registers of the ePWM module.

• HRPWM capabilities are offered only on the A signal path of an ePWM module (that is, on the

EPWMxA output). EPWMxB output has conventional PWM capabilities.

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