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LTM4676A データシート(PDF) 95 Page - Linear Technology |
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LTM4676A データシート(HTML) 95 Page - Linear Technology |
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95 / 136 page  LTM4676A 95 4676afa For more information www.linear.com/LTM4676A appenDix c: pMbus coMManD DeTails VOUT_MAX The VOUT_MAX command sets an upper limit on any voltage, including VOUT_MARGIN_HIGH, the unit can com- mand regardless of any other commands or combinations. The maximum allowed value of this command is 5.7 volts. The maximum output voltage the LTM4676A can produce is 5.5 volts including VOUT_MARGIN_HIGH. However, the VOUT_OV_FAULT_LIMIT can be commanded as high as 5.7 volts. This command has two data bytes and is formatted in Linear_16u format. VOUT_OV_FAULT_LIMIT The VOUT_OV_FAULT_LIMIT command sets the value of the output voltage measured at the sense pins, in volts, which causes an output overvoltage fault. If the VOUT_OV_FAULT_LIMIT is modified and the switcher is active, allow 10ms after the command is modified to assure the new value is being honored. The part indicates if it is busy making a calculation. Monitor bits 5 and 6 of MFR_COMMON. Either bit is low if the part is busy. If this wait time is not met, and the VOUT_COMMAND is modified above the old overvoltage limit, an OV condition might temporarily be detected resulting in undesirable behavior and possible damage to the switcher. If VOUT_OV_FAULT_RESPONSE is set to OV_PULLDOWN, the GPIO pin will not assert if VOUT_OV_FAULT is propa- gated. The LTM4676A will pull the TG low and assert the BG bit as soon as the overvoltage condition is detected. This command has two data bytes and is formatted in Linear_16u format. VOUT_OV_WARN_LIMIT The VOUT_OV_WARN_LIMIT command sets the value of the output voltage measured at the sense pins, in volts, which causes an output voltage high warning. The READ_VOUT value will be used to determine if this limit has been exceeded. In response to the VOUT_OV_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 Overvoltage 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_MARGIN_HIGH The VOUT_MARGIN_HIGH 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 High”. The value must be greater than VOUT_COMMAND. The maximum guaranteed value on VOUT_MARGIN_HIGH 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. |
同様の部品番号 - LTM4676A |
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同様の説明 - LTM4676A |
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