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LTM4676A Datasheet(PDF) 97 Page - Linear Technology |
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LTM4676A Datasheet(HTML) 97 Page - Linear Technology |
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97 / 136 page  LTM4676A 97 4676afa For more information www.linear.com/LTM4676A appenDix c: pMbus coMManD DeTails CURRENT Input Current Calibration COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE MFR_IIN_OFFSET 0xE9 Coefficient used to add to the input current to account for the IQ of the part. R/W Word Y L11 A Y 0.0305 0x8BE7 MFR_IIN_OFFSET The MFR_IIN_OFFSET command allows the user to set an input current representing the quiescent current of each channel. For accurate results at low output current, the part should be in continuous conduction mode. (MFR_PWM_ MODE[0]=1b). See Table 8 for recommended values. This command has 2 data bytes and is formatted in Linear_5s_11s format. Output Current Calibration COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE IOUT_CAL_GAIN 0x38 The ratio of the voltage at the current sense pins to the sensed current. R/W Word Y L11 mΩ Factory- Only NVM Trimmed, 3.28mΩ typical MFR_IOUT_CAL_GAIN_TC 0xF6 Temperature coefficient of the current sensing element. R/W Word Y CF Y 3860 0x0F14 IOUT_CAL_GAIN The IOUT_CAL_GAIN command is nominally used to set the resistance value of the current sense element, in mil- liohms. (see also MFR_IOUT_CAL_GAIN_TC). Writes to this register result in a NACK and do not impact output current readback telemetry. This command has two data bytes and is formatted in Linear_5s_11s format. MFR_IOUT_CAL_GAIN_TC TheMFR_IOUT_CAL_GAIN_TCcommandallowstheusertoprogramthetemperaturecoefficientoftheIOUT_CAL_GAIN inductor DCR in ppm/°C. This command has two data bytes and is formatted in 16-bit 2’s complement integer ppm. N = –32768 to 32767 • 10–6. Nominal temperature is 27°C. The IOUT_CAL_GAIN is multiplied by: [1.0 + MFR_IOUT_CAL_GAIN_TC • (READ_TEMPERATURE_1-27)]. DCR sensing will have a typical value of 3900. The IOUT_CAL_GAIN and MFR_IOUT_CAL_GAIN_TC impact all current parameters including: READ_IOUT, READ_IIN, IOUT_OC_FAULT_LIMIT and IOUT_OC_WARN_LIMIT. Writes to this register are not recommended; use the factory- default value. Input Current COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE IIN_OC_WARN_LIMIT 0x5D Input overcurrent warning limit. R/W Word N L11 A Y 12 0xD300 |
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