LTM4677 datasheet(88/110 Pages) AD

88 / 110 page

LTC3888-1

Rev. 0

For more information www.analog.com

PMBus COMMAND DETAILS (Output Timing, Delays, and Ramping)

VOUT_TRANSITION_RATE

When using factory defaults, the VOUT_TRANSITION_RATE command sets the rate at which VFB changes during

soft-on/off and when margin commands are executed. If VOUT_SCALE_LOOP is definded this command specifies the

rate at which the output voltage changes whenever commanded to moved. In either case this rate of change does not

apply to operations that immediately turn the PWM channel on or off.

This command has two data bytes in Linear_5s_11s format.

TOFF_DELAY

The TOFF_DELAY command sets the delay, in milliseconds, between a stop condition and the beginning of the output

voltage fall. Values from 0s to 16s are considered valid.

This command has two data bytes in Linear_5s_11s format.

TOFF_MAX_WARN_LIMIT

The TOFF_MAX_WARN_LIMIT command sets the time, in milliseconds, VOUT is allowed to drop to 0.125xVOUT_

COMMAND after being commanded to 0V. This time begins after TOFF_DELAY+VOUT_COMMAND/VOUT_TRANSITION

expires if the output is not commanded to immediate off. If this limit is exceeded a warning is issued in VOUT_STATUS

and ALERT asserted if not masked. No warning limit is enforced if bit 0 of MFR_CHAN_CONFIG is set or the value of

this command is programmed to zero. Otherwise, values from 120ms to 524s are considered valid. In order to avoid

erroneous ALERT indication, VOUT_SCALE_LOOP and all other related VOUT commands must be defined before this

command is set to a non-zero value.

This command has two data bytes in Linear_5s_11s format.

LTM4677 Datasheet(PDF) 88 Page - Analog Devices