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LTM4676A Scheda tecnica(PDF) 26 Page - Linear Technology |
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LTM4676A Scheda tecnica(HTML) 26 Page - Linear Technology |
26 / 136 page LTM4676A 26 4676afa For more information www.linear.com/LTM4676A operaTion • Output voltage turn-off delay time (the time delay from the LTM4676A being commanded to turn off, e.g., by the RUNn pin toggling from logic high to low, before switching action ceases. TOFF_DELAYn). • When commanded to turn off its output—or, when turning off its output in response to a fault— configuringwhethertheLTM4676A'soutput(VOUTn) becomes high impedance (“High-Z” or “three state”—turning off both MTn and MBn in the power stage). (“Immediate Off”, ON_OFF_CONFIGn[0] = 1b vs configuring the output voltage to be ramped down according to TOFF_FALLn and/or TOFF_DELAYn set- tings, ON_OFF_CONFIGn[0] = 0b). • The amount of time (TOFF_MAX_WARN_LIMITn) permitted to elapse after the LTM4676A is supposed to have turned off its output, i.e., at the end of the period dictated by TOFF_FALLn, after which, If the output voltage has not fallen below 12.5% of the former target voltage of regulation, the LTM4676A’s output(VOUTn)isdeclaredtohavenotpowereddown in a timely manner. n Configurable output voltage restart time. Subsequent to theRUNnpinbeingpulledlow,theLTM4676ApullsRUNn logic low, itself, and the output cannot be restarted until a minimum time has elapsed—the restart delay time. This delay assures proper sequencing of all system rails. The minimum restart delay processed by the LTM4676A is the longer of (TOFF_DELAYn + TOFF_FALLn + 136ms) vs the commanded MFR_RESTART_DELAYn register value. At the end of this delay, the LTM4676A releases its RUNn pin. n Configurable fault-hiccup retry delay time. When a fault occurs in which the LTM4676A’s fault response behavior to that fault is to reattempt power-up of its output voltage after said fault ceases to be present (e.g., “Infinite Retry”), the delay time for the LTM4676A to re-engage switching action is the longer of the MFR_RETRY_DELAYn time vs the time required for the output to decay below 12.5% of the formerly com- manded output voltage value (unless this lattermost criteria, i.e., requiring the output to decay below 12.5% is negated by the setting of MFR_CHAN_CONFIGn[0]to “1b”—which is the LTM4676A’s factory-NVM default setting). n Output over/undervoltage fault responses (VOUT_OV_ FAULT_RESPONSEn,VOUT_UV_FAULT_RESPONSEn). n Time-averagedcurrentlimitwarningandinstantaneous peak(cycle-by-cycle)faultthresholds,andfaultresponse (IOUT_OC_WARN_LIMITn, IOUT_OC_FAULT_LIMITn, IOUT_OC_FAULT_RESPONSEn). n Channel (VOUT0, VOUT1) overtemperature warning and faultthresholds,andfaultresponse(OT_WARN_LIMITn, OT_FAULT_LIMITn, OT_FAULT_RESPONSEn). n Channel (VOUT0, VOUT1) undertemperature fault thresholds and fault response (UT_FAULT_LIMITn, UT_FAULT_RESPONSEn). n Input overvoltage fault threshold and response (VIN_OV_FAULT_LIMIT,VIN_OV_FAULT_RESPONSE), based on the SVIN pin voltage. n Inputundervoltagewarningthreshold(VIN_UV_WARN_ LIMIT) based on the SVIN pin voltage. n Module input overcurrent warning threshold (IIN_OC_WARN_LIMIT) The control IC within the LTM4676A module ceases switching action if control IC temperature exceeds 160°C (Note 12). The control IC resumes operation after a 10°C cool-down hysteresis. Note that these typical parameters are based on measurements in a lab oven and are not production tested. This overtemperature protection is intended to protect the device during momentary overload conditions. The maximum rated junction temperature will be exceeded when this protection is active. Continuous operation above the specified absolute maximum operat- ing junction temperature may impair device reliability or permanently damage the device. TIME-AVERAGED AND PEAK READBACK DATA Time-averaged telemetry readback data accessible via I2C communications follow: n Channel output current (READ_IOUTn) and peak ob- served value of READ_IOUTn (MFR_IOUT_PEAKn). |
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