UCD3138128APFC datasheet(41/83 Pages) TI1

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CYCLE BY CYCLE

CLIM

FAULT - CBC

FAULT MODULE

FAULT IN

FAULT FLAG

UCD3138128A

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SLUSC99 – JULY 2016

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Figure 27. Fault Module

All fault modules provide immediate fault detection but only once per DPWM switching cycle. Each one of the

fault modules own a separate max_count and the fault flag will be set only if sequential cycle-by-cycle fault count

exceeds max_count.

Once the fault flag is set, DPWMs need to be disabled by DPWM_EN going low in order to clear the fault flags.

Please note, all four Fault Modules share the same DPWM_EN control, all fault flags (output of Fault Modules)

will be cleared simultaneously.

All four Fault Modules share the same global FAULT_EN as well. Therefore a specific Fault Module cannot be

enabled/ disabled separately.

Figure 28. Cycle-By-Cycle Block

Unlike Fault Modules, only one Cycle by Cycle block is available in each DPWM module.

The Cycle by Cycle block works in conjunction with CBC Fault Module and enables DPWM reaction to signals

arriving from the Analog Peak current mode (PCM) module.

The Fault Mux Module supports the following basic functions:

•

4 digital comparators with programmable thresholds and fault generation

•

Configuration for 7 high speed analog comparators with programmable thresholds and fault generation

•

External GPIO detection control with programmable fault generation

•

Configurable DPWM fault generation for DPWM Current Limit Fault, DPWM Over-Voltage Detection Fault,

DPWM A External Fault, DPWM B External Fault and DPWM IDE Flag

•

Clock Failure Detection for High and Low Frequency Oscillator blocks and XTAL failure

•

Discontinuous Conduction Mode Detection

UCD3138128APFC Folha de dados(PDF) 41 Page - Texas Instruments