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LT7184S データシート(PDF) 26 Page - Analog Devices |
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LT7184S データシート(HTML) 26 Page - Analog Devices |
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26 / 52 page  Data Sheet LT7184S analog.com Rev. 0 26 of 52 FAULT PINS A fault will cause the FAULTN pin to pull low if the corresponding FAULT_RESPONSE command is programmed to shut down the regulator output and the MFR_FAULT_PROPAGATE_LT7184S command is configured to propagate the fault to the open drain FAULTN pin. Once the LT7184S pulls down a FAULTN pin, the device will continue to hold the pin low until one of the following occurs: The channel retries for faults that are configured to retry. The faulted channel is disabled and then re-enabled. A RESTORE_USER_ALL or MFR_RESET command is received. Input power is removed from both PVIN0 and EXTVCC. The FAULTN pin can also be used as an input to provide a method for the LT7184S to respond to external faults. The channel turns off immediately if the channel's FAULTN pin is pulled low externally. This enables the coordination of faults among multiple power systems management products. PGOOD PINS The open-drain PGOODN pins are each pulled low if the corresponding channel is off for any reason, during soft-start and soft-stop, or if the output voltage is below the VOUT_UV_FAULT_LIMIT or above the VOUT_OV_FAULT_LIMIT. ALERT PIN The SMBALERT_MASK command configures which warning and fault indicators cause the LT7184S to pull down the open drain ALERT pin. Once the LT7184S pulls down the ALERT pin, the device will continue to hold the pin low until one of the following occurs: The faulted channel is disabled and then re-enabled. A CLEAR_FAULTS, RESTORE_USER_ALL or MFR_RESET command is received. All unmasked status bits are cleared by writing a 1 to each Bit. The LT7184S successfully transmits its address during a PMBus Alert Response Address (ARA). Input power is removed from both PVIN0 and EXTVCC. FAULT Event Logging If a fault condition occurs that is configured to turn off the regulator output, an event is written in the fault log in EEPROM. Any preceding warning or fault that is not configured to turn off the output is written as a sub-event when an event is written. A timestamp is written with each event and sub-event. The fault log stores up to three fault-off events. The fault log may be read by the MFR_FAULT_LOG command. The fault log is cleared from EEPROM by writing the MFR_FAULT_LOG_CLEAR command. The fault log function is enabled by default and may be disabled by clearing Bit 7 of the MFR_CONFIG_ALL command. Refer to the MFR_FAULT_LOG command in the LT7184S PMBus/I2C Reference Manual for more details. Table 6. Factory Default Warnings and Fault Behavior WARNING OR FAULT TYPE1 DETECTION METHOD DEFAULT THRESHOLD DEFAULT REGULATOR RESPONSE DEFAULT PIN RESPONSE PGOODN FAULTN ALERT VOUT UV Warning VSENSE comparator VOUT_COMMAND - 6.5% Continue operation Pull low VOUT OV Warning VSENSE comparator VOUT_COMMAND + 7.5% Continue operation Pull low VOUT UV Fault VSENSE comparator VOUT_COMMAND - 7% Continue operation Pull low Pull low |
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