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LTM4676A Datasheet(PDF) 96 Page - Linear Technology |
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LTM4676A Datasheet(HTML) 96 Page - Linear Technology |
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96 / 136 page  LTM4676A 96 4676afa For more information www.linear.com/LTM4676A appenDix c: pMbus coMManD DeTails VOUT_COMMAND The VOUT_COMMAND consists of two bytes and is used to set the output voltage, in volts. The maximum guaranteed value on VOUT is 5.5 volts. ThiscommandwillnotbeactedonduringTON_RISEandTOFF_FALLoutputsequencing.TheVOUT_TRANSITION_RATE will be used if this command is modified while the output is active and in a steady-state condition. This command has two data bytes and is formatted in Linear_16u format. VOUT_MARGIN_LOW The VOUT_MARGIN_LOW command loads the unit with the voltage to which the output is to be changed, in volts, when the OPERATION command is set to “Margin Low”. The value must be less than VOUT_COMMAND. ThiscommandwillnotbeactedonduringTON_RISEandTOFF_FALLoutputsequencing.TheVOUT_TRANSITION_RATE will be used if this command is modified while the output is active and in a steady-state condition. This command has two data bytes and is formatted in Linear_16u format. VOUT_UV_WARN_LIMIT The VOUT_UV_ WARN_LIMIT command reads the value of the output voltage measured at the sense pins, in volts, which causes an output voltage low warning. In response to the VOUT_UV_WARN_LIMIT being exceeded, the device: • Sets the NONE_OF_THE_ABOVE bit in the STATUS_BYTE • Sets the VOUT bit in the STATUS_WORD • Sets the VOUT Undervoltage Warning bit in the STATUS_VOUT command • Notifies the host by asserting ALERT pin, unless masked. This condition is detected by the ADC so the response time may be up to 90ms, typical. This command has two data bytes and is formatted in Linear_16u format. VOUT_UV_FAULT_LIMIT The VOUT_UV_FAULT_LIMIT command reads the value of the output voltage measured at the sense pins, in volts, which causes an output undervoltage fault. This command has two data bytes and is formatted in Linear_16u format. MFR_VOUT_MAX The MFR_VOUT_MAX command is the maximum output voltage in volts for each channel including VOUT_OV_FAULT_ LIMIT. If the output voltages are set to high range (Bit 1 of MFR_PWM_MODE set to a 0) MFR_VOUT_MAX for channel 0 and 1 is 5.7V. If the output voltages are set to low range (Bit 1 of MFR_PWM_MODE set to a 1) the MFR_VOUT_MAX for both channels is 2.75V. Entering VOUT_COMMAND values greater than this will result in a CML fault and the output voltage setting will be clamped to the maximum level. This read-only command has 2 data bytes and is formatted in Linear_16u format. |
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