Pwm-Chopper Submodule; Pwm-Chopper Submodule Registers - Texas Instruments Concerto F28M35 Series Technical Reference Manual

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7.2.6 PWM-Chopper (PC) Submodule

illustrates the PWM-chopper (PC) submodule within the ePWM module.

Digital Compare

The PWM-chopper submodule allows a high-frequency carrier signal to modulate the PWM waveform

generated by the action-qualifier and dead-band submodules. This capability is important if you need

pulse transformer-based gate drivers to control the power switching elements.

Purpose of the PWM-Chopper Submodule

The key functions of the PWM-chopper submodule are:

Programmable chopping (carrier) frequency

Programmable pulse width of first pulse

Programmable duty cycle of second and subsequent pulses

Can be fully bypassed if not required

Controlling the PWM-Chopper Submodule

The PWM-chopper submodule operation is controlled via the registers in

Operational Highlights for the PWM-Chopper Submodule

shows the operational details of the PWM-chopper submodule. The carrier clock is derived

from SYSCLKOUT. Its frequency and duty cycle are controlled via the CHPFREQ and CHPDUTY bits in

the PCCTL register. The one-shot block is a feature that provides a high energy first pulse to ensure hard

and fast power switch turn on, while the subsequent pulses sustain pulses, ensuring the power switch

remains on. The one-shot width is programmed via the OSHTWTH bits. The PWM-chopper submodule

can be fully disabled (bypassed) via the CHPEN bit.

SPRUH22I – April 2012 – Revised November 2019

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Figure 7-33. PWM-Chopper Submodule

Counter Compare

Digital Compare

Table 7-18. PWM-Chopper Submodule Registers

Address Offset

Digital Compare

PWM-Chopper Control Register

C28 Enhanced Pulse Width Modulator (ePWM) Module

ePWM Submodules

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