Identify the regulation threshold subject
Current feedback supplies information; the regulation comparator decides whether the chopping threshold has been reached. TI's DRV8876 discussion describes comparing a current-related voltage with a reference. The threshold comparison is the subject here, rather than the separate mechanism that creates the feedback representation.
Reaching that comparison condition can request a change in bridge operation. Merely having feedback available does not identify whether regulation is enabled or which chopping mode applies. TI explicitly describes an independent half-bridge context with feedback available while internal regulation is disabled. Preserve the active regulation function alongside the threshold subject. This distinction leaves the more detailed current-sensing architecture to its own account and brings the threshold's qualification and subsequent rearm into focus.
Retain transient qualification before chopping
A threshold magnitude does not describe every condition under which the comparator can initiate chopping. TI separately describes blanking and deglitch intervals for the DRV8876 current-regulation comparison. These qualify the interpretation of the current-related signal around switching activity. They therefore belong to the decision process even when the threshold reference itself is unchanged.
Blanking addresses voltage and current transients associated with output switching. The note identifies disturbances from the motor or its connections as relevant to that context. A switching-related excursion is not automatically a sustained load-current condition. Keeping blanking explicit explains why the comparison cannot be understood solely as an unrestricted, continuously actionable threshold crossing.
Deglitch qualification addresses transient conditions that could prematurely initiate current regulation. It is a distinct function from the level of the threshold and from the blanking role. A description that retains only the current-limit setting omits how the device qualifies the event before acting on it. Conversely, naming qualification does not change the threshold into a different current quantity.
The resulting distinction is between a signal excursion, a qualified regulation decision and the later bridge response. Those stages should remain intelligible individually. Qualification describes the named device's treatment of transients; it is not an assertion that every possible current peak will be intercepted. No transient-filter component or sampling method is needed to explain this control boundary.
Compare automatic and input-edge rearm
After a qualified chopping event, the rearm policy determines what allows the outputs to follow the command again. TI describes fixed-off-time regulation as entering a brake interval and then returning according to the control inputs, subject to the current comparison. If the current remains above threshold, another internal interval can follow. This assigns the recurring rearm opportunity to the driver's internal interval mechanism.
Cycle-by-cycle chopping places a different condition on that transition. The described bridge remains in its chopping state until another qualifying control-input edge arrives. The external controller therefore participates in the return to commanded drive. An unchanged input command and a newly arriving edge are different conditions, even when both relate to the same requested direction of operation.
This is why the two modes are different control contracts rather than alternative names for one threshold. Fixed-off-time operation does not require a fresh command edge for its internal rearm opportunity. Cycle-by-cycle operation does. A continuously asserted command consequently has a different significance after chopping in the two descriptions. The threshold event alone cannot tell the reader which contract applies.
The note also describes control-input changes affecting the fixed-off-time interval. That reinforces the need to retain command context alongside the internal mechanism, rather than interpreting the interval as an unconditional output waveform. The comparison here concerns responsibility for rearm, with the actual mode-selection method and timing left to the device's applicable implementation evidence.
Separate regulation indication from protection action
The cycle-by-cycle discussion gives the chopping indication a specific meaning. TI describes the fault output also indicating entry into internal current chopping, while the driver continues its normal regulation operation. The same indication name must therefore be interpreted with the commanded operating state rather than read automatically as a unique overcurrent fault.
The note relates that chopping indication to a commanded drive state. It contrasts this with an asserted indication when the command is for other stated bridge conditions. The useful point is the relationship between the indication and the command: the output signal alone does not identify the complete event. This remains a motor-regulation distinction, rather than a list of unrelated diagnostic capabilities.
Overcurrent protection is described separately, with its own threshold qualification and protective response. Regulation chopping, its indication and a protective disabling action should therefore retain their separate meanings. A threshold setting, a qualified chopping decision and a later rearm requirement together describe the regulation contract; a general protection label cannot replace those details.
Sources and further reading
TI DRV8876 SLVSDS7B, bounded prose on physical pages 11 and 13–16: threshold qualification, rearm and indication context. No threshold computation, mode-setting recipe, component choice, timing values, waveform interpretation or actual board configuration is supplied.