UCD3138ARMHT datasheet(43/87 Pages) TI1

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CYCLE BY CYCLE

CLIM

FAULT - CBC

FAULT MODULE

FAULT IN

FAULT FLAG

UCD3138A

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SLUSC66C – MARCH 2015 – REVISED SEPTEMBER 2016

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Detailed Description

The Fault Mux Module provides a multitude of fault protection functions within the UCD3138A 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.

The internal circuitry in all the four fault modules is identical, and the difference between the modules is

limited to the output it affects under a fault condition.

Figure 7-10. Fault Module

All fault modules are capable of detecting faults only once per DPWM switching cycle. Each one of the

fault modules have a separate max_count value and the device sets the fault flag only when the

sequential faults count exceeds the max_count value.

After the fault flag is set, DPWMs must be disabled by DPWM_EN going low in order to clear the fault

flags.

NOTE

All four fault modules share the same DPWM_EN control. The device clears all fault flags

(output of fault modules) simultaneously.

All four Fault Modules share the same global FAULT_EN as well. Therefore, a specific Fault Module

cannot be enabled/ disabled separately.

Figure 7-11. Cycle by Cycle Block

In contrast to the fault modules, only one cycle by cycle block is available in each DPWM module.

The cycle by cycle block can work in conjunction with CBC Fault Module and enables DPWM reaction to

signals arriving from 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 overvoltage detection fault,

DPWM A external fault, DPWM B external fault and DPWM IDE flag

•

Clock failure detection for high and low frequency oscillator blocks

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