UCD3138 datasheet(47/68 Pages) TI1

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FAULT - CBC

FAULT - AB

FAULT -A

DCOMP – 4X

EXT GPIO – 4X

ACOMP – 7X

FAULT -B

FAULT MODULE

CYCLE BY CYCLE

AB FLAG

A FLAG

B FLAG

DISABLE PWM A AND B

DISABLE PWM A ONLY

DISABLE PWM B ONLY

FAULT MUX

ALL_FAULT_EN

DPWM_EN

DPWM

CBC_FAULT_EN

CBC_PWM_AB_EN

FAULT MODULE

DIG PCM

ANALOG PCM

Bit20 in DPWMCTRL0

Bit30 in DPWMFLTCTRL

Bit 31 in DPWMFLTCTRL

Bit0 in DPWMCTRL0

UCD3138

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SLUSAP2 A – MARCH 2012 – REVISED MARCH 2012

4.14.2 Fault Multiplexer

In order to allow a flexible way of mapping several fault triggering sources to all the DPWMs channels, the

UCD3138 provides an extensive array of multiplexers that are united under the name Fault Mux module.

The Fault Mux Module supports the following types of mapping between all the sources of fault and all

different fault response mechanism inside each DPWM module.

•

Many fault sources mapped to a single fault response mechanism. For instance an analog comparator

in charge of over voltage protection, a digital comparator in charge of over current protection and an

external digital fault pin can be all mapped to a fault-A signal connected to a single FAULT MODULE

and shut down DPWM1-A.

•

A single fault source can be mapped to many fault response mechanisms inside many DPWM

modules. For instance an analog comparator in charge of over current protection can be mapped to

DPWM-0 through DPWM-3 by way of several fault modules.

•

Many fault sources can be mapped to many fault modules inside many DPWM modules.

The Fault Mux Module provides a multitude of fault protection functions within the UCD3138 high-speed

loop (Front End Control, Filter, DPWM and Loop Mux modules). The Fault Mux Module allows highly

configurable fault generation based on digital comparators, high-speed analog comparators and external

fault pins. Each of the fault inputs to the DPWM modules can be configured to one or any combination of

the fault events provided in the Fault Mux Module.

Each one of the DPWM engines has four fault modules. The modules are called CBC fault module, AB

fault module, A fault module and B fault module.

Functional Overview

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