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LTM4686BIVPBF 数据表(PDF) 91 Page - Analog Devices |
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LTM4686BIVPBF 数据表(HTML) 91 Page - Analog Devices |
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91 / 130 page  LTM4686B 91 Rev. 0 For more information www.analog.com APPENDIX C: PMBUS COMMAND DETAILS 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 LTM4686B 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 3.6V. This command will not be acted on during TON_RISE and TOFF_FALL output sequencing. The VOUT_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_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 3.6V. This command will not be acted on during TON_RISE and TOFF_FALL output sequencing. The VOUT_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. This command will not be acted on during TON_RISE and TOFF_FALL output sequencing. The VOUT_TRANSITION_ RATE will be used if this command is modified while the output is active and in a steady-state condition. |
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