TPS53676 datasheet(64/143 Pages) TI

部品番号	TPS53676

部品情報	TPS53676 Dual-Channel D-CAP?? (NM ??7 Phases) Step-Down, Multiphase Controller with AVSBus??and PMBus??Interfaces

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7.7.4 Detailed fault descriptions

7.7.4.1 Overvoltage fault (OVF) and warning (OVW)

TPS53676 supports several forms of overvoltage protection. The figure below describes the overvoltage

protection scheme in more detail.

• Pre-Bias OVF protects the converter while initialization runs. This protection is active tINIT-PBOV, 350 μs

maximum after the VCC pin voltage is established, until initialization is complete. The threshold is hard-coded

to 3.7 V. In response to this condition, all PWM pins (regardless of channel assignment) pull low, regardless

of the overvoltage response setting. This fault cannot be cleared without a power cycle of the VCC pin. The

fixed overvoltage protection becomes active after tINIT-LOGIC , up to 20 ms after the VCC pin voltage is

established. This fault detection cannot be disabled.

• Fixed OVF is a programmable limit based on the VSP pin voltage, above which it is not safe to operate the

load device. Program the threshold through the MFR_PROTECTION_CONFIG command. This fault

detection is active regardless of power conversion. If triggered while power conversion is disabled, this fault is

treated as potentially catastrophic, and cannot be cleared without a power cycle of the VCC pin.

• Tracking OVF is a fault limit, programmable as an offset from the current VOUT_COMMAND value. Program

this threshold through VOUT_OV_FAULT_LIMIT. When the VSP-VSN pin differential voltage exceeds this

limit during power conversion, the tracking overvoltage fault condition is detected. This fault detection is

disabled whenever power conversion is disabled.

• Tracking OVW is a warning limit, programmable as an offset from the current VOUT_COMMAND value.

Program this threshold through VOUT_OV_WARN_LIMIT. When the VSP-VSN pin differential voltage

exceeds this limit during power conversion, the tracking overvoltage warning condition is detected. This is a

warning condition only, and does not cause any interruption to power conversion. The overvoltage warning

provides early feedback to they system host allowing it to make adjustments prior a fault triggering.

In response to the overvoltage warning condition, TPS53676 sets the appropriate status bits in STATUS_WORD

and STATUS_VOUT and asserts the SMB_ALERT# line if these bits are not masked.

In response to the overvoltage fault condition TPS53676 responds according to the programmed

VOUT_OV_FAULT_RESPONSE. When not set to the ignore response, this causes the PWM pins of the rail

which experienced a fault to pull low immediately. Additionally, TPS53676 sets the appropriate status bits in

STATUS_WORD and STATUS_VOUT and asserts the SMB_ALERT# line if these bits are not masked.

VR_EN

VOUT

VR_RDY

VOFS-UVFTRK

VCC

VOV-FIXED

VOV-PREBIAS

No

OVP

Pre-Bias

OVP only

Fixed

OVP only

First PWM pulses

Fixed +Tracking OVP

Fixed

OVP only

tINIT-PBOV

tINIT-LOGIC

VOFS-UVWTRK

VOFS-OVFTRK

VOFS-UVFTRK

Figure 7-28. Overvoltage Protection

Program the tracking overvoltage fault threshold through the VOUT_OV_FAULT_LIMIT command as an absolute

voltage. When a new VOUT_OV_FAULT_LIMIT command is received the device calculates the tracking

overvoltage offset value internally according to the equation below. The threshold voltages get scaled with the

TPS53676

SLUSDP0 – DECEMBER 2020

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