LTM4686BIVPBF datasheet(103/130 Pages) AD

103 / 130 page

LTM4686B

103

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

IOUT_OC_FAULT_RESPONSE

The IOUT_OC_FAULT_RESPONSE command instructs the device on what action to take in response to an output

overcurrent fault. The data byte is in the format given in Table 26.

The device also:

• Sets the IOUT_OC bit in the STATUS_BYTE

• Sets the IOUT bit in the STATUS_WORD

• Sets the IOUT Overcurrent Fault bit in the STATUS_IOUT command, and

• Notifies the host by asserting ALERT pin, unless masked.

This command has one data byte.

Table 26. IOUT_OC_FAULT_RESPONSE Data Byte Contents

BITS DESCRIPTION

VALUE MEANING

7:6 Response

For all values of bits [7:6], the LTM4686B:

• Sets the corresponding fault bit in the status commands and

• Notifies the host by asserting ALERT pin, unless masked.

The fault bit, once set, is cleared only when one or more of the

following events occurs:

• The device receives a CLEAR_FAULTS command

• The output is commanded through the RUNn pin, the OPERATION

command, or the combined action of the RUNn pin and

OPERATION command, to turn off and then to turn back on, or

• Bias power is removed and reapplied to the LTM4686B.

The LTM4686B continues to operate indefinitely while

maintaining the output current at the value set by IOUT_OC_

FAULT_LIMIT without regard to the output voltage (known as

constant-current or brick-wall limiting).

Not supported.

The LTM4686B continues to operate, maintaining the output

current at the value set by IOUT_OC_FAULT_LIMIT without

regard to the output voltage, for the delay time set by bits [2:0].

If the device is still operating in current limit at the end of the

delay time, the device responds as programmed by the Retry

Setting in bits [5:3].

The LTM4686B shuts down immediately and responds as

programmed by the Retry Setting in bits [5:3].

5:3 Retry Setting

000–110 The unit does not attempt to restart. The output remains

disabled until the fault is cleared by cycling the RUNn pin or

removing bias power.

111

The device attempts to restart continuously, without limitation,

until it is commanded OFF (by the RUNn pin or OPERATION

command or both), bias power is removed, or another fault

condition causes the unit to shut down. Note: The retry interval

is set by the MFR_RETRY_DELAY command.

2:0 Delay Time

XXX

The number of delay time units in 16ms increments. This

delay time is used to determine the amount of time a unit is

to continue operating after a fault is detected before shutting

down. Only valid for deglitched off state.

Fault Responses IC Temperature

COMMAND NAME

CMD CODE DESCRIPTION

TYPE

PAGED

DATA

FORMAT UNITS NVM

DEFAULT

VALUE

MFR_OT_FAULT_RESPONSE

0xD6

Action to be taken by the device when an

internal overtemperature fault is detected.

R Byte

Reg

0xC0

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