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LTM4686BEVPBF 数据表(PDF) 86 Page - Analog Devices |
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LTM4686BEVPBF 数据表(HTML) 86 Page - Analog Devices |
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86 / 130 page  LTM4686B 86 Rev. 0 For more information www.analog.com APPENDIX C: PMBUS COMMAND DETAILS OPERATION The OPERATION command is used to turn the unit on and off in conjunction with the input from the RUNn pins. It is also used to cause the unit to set the output voltage to the upper or lower MARGIN VOLTAGEs. The unit stays in the commanded operating mode until a subsequent OPERATION command or change in the state of the RUNn pin instructs the device to change to another mode. If the part is stored in the MARGIN_LOW/HIGH state, the next MFR_RESET or RESTORE_USER_ALL or SVIN power cycle will ramp to that state. If the OPERATION command is modified, for example ON is changed to MARGIN_LOW, the output will move at a fixed slope set by the VOUT_TRANSITION_RATE. The default operation command is sequence off. Margin High (Ignore Faults) and Margin Low (Ignore Faults) operations are not supported by the LTM4686B. The part defaults to the Sequence Off state. This command has one data byte. Table 23. OPERATION Command Detail Register OPERATION Data Contents When On_Off_Config_Use_PMBus Enables Operation_Control SYMBOL ACTION VALUE BITS FUNCTION Turn off immediately 0x00 Turn on 0x80 Margin Low 0x98 Margin High 0xA8 Sequence off 0x40 OPERATION Data Contents When On_Off_Config is Configured Such That OPERATION Command Is Not Used to Command Channel On or Off SYMBOL ACTION VALUE BITS FUNCTION Output at Nominal 0x80 Margin Low 0x98 Margin High 0xA8 Note: Attempts to write a reserved value will cause a CML fault. MFR_RESET ThiscommandprovidesameansbywhichtheusercanperformaresetoftheLTM4686B.IdenticaltoRESTORE_USER_ALL. This write-only command has no data bytes. PWM CONFIG COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE MFR_PWM_MODE 0xD4 Configuration for the PWM engine of each channel. R/W Byte Y Reg Y 0xC3 MFR_PWM_CONFIG 0xF5 Set numerous parameters for the DC/DC controller including phasing. R/W Byte N Reg Y 0x10 FREQUENCY_SWITCH 0x33 Switching frequency of the controller. R/W Word N L11 kHz Y 1000 0x03E8 |
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