LTM4686BIVPBF datasheet(87/130 Pages) AD

87 / 130 page

LTM4686B

Rev. 0

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APPENDIX C: PMBUS COMMAND DETAILS

MFR_PWM_MODE

The MFR_PWM_MODE command allows the user to program the PWM controller to use, discontinuous (pulse-skipping

mode), or forced continuous conduction mode.

BIT

MEANING

Range of ILIMIT

0 – Low Current Range

1 – High Current Range

Enable Servo Mode

Reserved

Page 0 Only: Use of TSNS1a-Sensed Temperature Telemetry

0 – Temperature sensed via TSNS1a is used to temperature-correct the current-sense information digitized by Channel 1.

1 – Temperature sensed via TSNS0 is used to temperature-correct the current-sense information digitized by Channel 1. Telemetry obtained

from the thermal sensor connected to TSNS1a can be external to the module, if desired.

Reserved

Voltage Range

0 – Hi Voltage Range 3.6 volts max

1 – Lo Voltage Range 2.75 volts max

PWM Mode

0 – Discontinuous Mode

1 – Continuous Mode

Whenever the channel is ramping on, the PWM mode will be discontinuous, regardless of the value of this

command.

Bit [7] of this command determines if the part is in high range or low range of the IOUT_OC_FAULT_LIMIT command.

Changing this bit value changes the PWM loop gain and compensation. Changing this bit value whenever an output is

active may have detrimental system results.

Bit [6] The LTM4686B will not servo while the part is OFF, ramping on or ramping off. When set to a one, the output servo

is enabled. The output set point DAC will be slowly adjusted to minimize the difference between the READ_VOUT_ADC

and the VOUT_COMMAND (or the appropriate margined value).

Bit [1] of this command determines if the part is in high range or low voltage range. Changing this bit value changes

the PWM loop gain and compensation. This bit value cannot be changed when an output is active.

This command has one data byte.

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