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LTM4686BEVPBF 数据表(PDF) 97 Page - Analog Devices |
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LTM4686BEVPBF 数据表(HTML) 97 Page - Analog Devices |
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97 / 130 page  LTM4686B 97 Rev. 0 For more information www.analog.com APPENDIX C: PMBUS COMMAND DETAILS TON_DELAY The TON_DELAY command sets the time, in milliseconds, from when a start condition is received until the output voltage starts to rise. Values from 0ms to 83 seconds are valid. This command has two data bytes and is formatted in Linear_5s_11s format. TON_RISE The TON_RISE command sets the time, in milliseconds, from the time the output starts to rise to the time the output enters the regulation band. Values from 0 to 1.3 seconds are valid. The part will be in discontinuous mode during TON_RISE events. If TON_RISE is less than 0.25ms, the LTM4686B digital slope will be bypassed. The output voltage transition will be controlled by the analog performance of the PWM switcher. The maximum allowed slope is 4V/ms. This command has two data bytes and is formatted in Linear_5s_11s format. TON_MAX_FAULT_LIMIT The TON_MAX_FAULT_LIMIT command sets the value, in milliseconds, on how long the unit can attempt to power up the output without reaching the output undervoltage fault limit. A data value of 0ms means that there is no limit and that the unit can attempt to bring up the output voltage indefinitely. The maximum limit is 83 seconds. This command has two data bytes and is formatted in Linear_5s_11s format. VOUT_TRANSITION_RATE When a PMBus device receives either a VOUT_COMMAND or OPERATION (Margin High, Margin Low) that causes the output voltage to change this command set the rate in V/ms at which the output voltage changes. This commanded rate of change does not apply when the unit is commanded on or off. This command has two data bytes and is formatted in Linear_5s_11s format. Timing: Off Sequence/Ramp COMMAND NAME CMD CODE DESCRIPTION TYPE PAGED DATA FORMAT UNITS NVM DEFAULT VALUE TOFF_DELAY 0x64 Time from RUN and/or Operation off to the start of TOFF_FALL ramp. R/W Word Y L11 ms Y 0.0 0x0000 TOFF_FALL 0x65 Time from when the output starts to fall until the output reaches zero volts. R/W Word Y L11 ms Y 2.5 0xC280 TOFF_MAX_WARN_LIMIT 0x66 Maximum allowed time, after TOFF_FALL completed, for the unit to decay below 12.5%. R/W Word Y L11 ms Y 200 0xF320 TOFF_DELAY The TOFF_DELAY command sets the time, in milliseconds, from when a stop condition is received until the output voltage starts to fall. Values from 0 to 83 seconds are valid. This command is excluded from fault events. This command has two data bytes and is formatted in Linear_5s_11s format. |
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