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LTM4686BEVPBF 数据表(PDF) 90 Page - Analog Devices |
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LTM4686BEVPBF 数据表(HTML) 90 Page - Analog Devices |
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90 / 130 page  LTM4686B 90 Rev. 0 For more information www.analog.com APPENDIX C: PMBUS COMMAND DETAILS Output Voltage and Limits COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE VOUT_MODE 0x20 Output voltage format and exponent (2–12). R Byte Y Reg 2–12 0x14 VOUT_MAX 0x24 Upper limit on the commanded output voltage including VOUT_MARGIN_HIGH. R/W Word Y L16 V Y 3.630 0x3A14 VOUT_OV_FAULT_ LIMIT 0x40 Output overvoltage fault limit. R/W Word Y L16 V Y 1.100V 0x119A VOUT_OV_WARN_ LIMIT 0x42 Output overvoltage warning limit. R/W Word Y L16 V Y 1.075V 0x1133 VOUT_MARGIN_HIGH 0x25 Margin high output voltage set point. Must be greater than VOUT_COMMAND. R/W Word Y L16 V Y 1.050V 0x10CD VOUT_COMMAND 0x21 Nominal output voltage set point. R/W Word Y L16 V Y 1.000V 0x1000 VOUT_MARGIN_LOW 0x26 Margin low output voltage set point. Must be less than VOUT_COMMAND. R/W Word Y L16 V Y 0.950V 0x0F33 VOUT_UV_WARN_ LIMIT 0x43 Output undervoltage warning limit. R/W Word Y L16 V Y 0.925V 0x0ECD VOUT_UV_FAULT_ LIMIT 0x44 Output undervoltage fault limit. R/W Word Y L16 V Y 0.900V 0x0E66 MFR_VOUT_MAX 0xA5 Maximum allowed output voltage including VOUT_OV_FAULT_LIMIT. R Word Y L16 V 5.7 0x5B34 VOUT_MODE The data byte for VOUT_MODE command, used for commanding and reading output voltage, consists of a 3-bit mode (only linear format is supported) and a 5-bit parameter representing the exponent used in output voltage Read/Write commands. This read-only command has one data byte. 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 LTM4686B can produce is 3.6 volts including VOUT_MARGIN_HIGH. However, the VOUT_OV_FAULT_LIMIT can be commanded as high as 4.0 volts. The LTM4686B is not specified for operation above 3.6VOUT. 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 |
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