MCT8317A datasheet(54/161 Pages) TI1

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Phase A

Voltage

FG_SEL = 00

FG_SEL = 01

Open Loop

Close Loop

Phase A

Voltage

FG_SEL

= 10

Open Loop

Close Loop

Open Loop

Close Loop

Startup after power on or wake up from

sleep or standby mode

Rest of startups

Figure 8-43. FG Behavior During Open Loop

8.3.19 Protections

The MCT8317A is protected from a host of fault events including motor lock, VM undervoltage, AVDD

undervoltage, buck undervoltage, charge pump undervoltage, overtemperature and overcurrent events. Table

8-1 summarizes the response, recovery modes, power stage status, reporting mechanism for different faults.

Table 8-1. Fault Action and Response

FAULT

CONDITION

CONFIGURATION

REPORT

PRE_DRIVER

DIGITAL

RECOVERY

VM undervoltage

(VM_UV)

VVM < VUVLO (falling)

—

nFAULT and

GATE_DRIVER_FA

ULT_STATUS

registe

Hi-Z

Active

Automatic:

TRETRY and VVM > VUVLO (rising)

VIN_AVDD under

voltage

(VIN_AVDD_UV)

VVIN_AVDD < VVIN_AVDD_UV

(falling)

—

Hi-Z

Disabled

Automatic: VVIN_AVDD > VVIN_AVDD_UV

(rising)

AVDD undervoltage

VAVDD < VAVDD_UV (falling)

—

Hi-Z

Disabled

Automatic:

VAVDD > VAVDD_UV (rising)

Charge pump

undervoltage

(CP_UV)

VCP < VCPUV (falling)

—

nFAULT and

GATE_DRIVER_FA

ULT_STATUS

Hi-Z

Active

Automatic:

TRETRY and VCP > VCPUV (rising)

MCT8317A

SLLSFQ2 – JANUARY 2023

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