MP2886A datasheet(80/113 Pages) MPS

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MP2886A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID

MP2886A Rev. 1.0

www.MonolithicPower.com

1/21/2019

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

MFR_PWMVID_FLTR_CTRL1 (B1h)

This register sets the performance of the digital PWM-VID filters.

Command

MFR_PWMVID_FLTR_CTRL1

Format

Unsigned binary

Bit

Access

r/w

Function

Bits

Bit Name

Description

15:13

DVID_DOWN_START_

THRE

Threshold for the downward DVID starting indicator (DVID_TRIG_MODE = 0).

When VOUT is settled, the controller uses the output of the second-stage filter as

VO_REF. When the calculated VID_TARGET is less than the current VO_REF -

DVID_DOWN_START_THRE, the controller enters the downward DVID, and

VO_REF switches to the first-stage filter output.

DVID_DOWN_START_THRE must be greater than DVID_DOWN_END_THRE.

12:10

DVID_UP_START_

THRE

Threshold for the upward DVID starting indicator (DVID_TRIG_MODE = 0). When

VOUT is settled, the controller uses the output of the second-stage filter as VO_REF.

When the calculated VID_TARGET is greater than the current VO_REF +

DVID_UP_START_THRE, the controller enters the upward DVID, and VO_REF

switches to the output of the first-stage filter.

DVID_UP_START_THRE must be greater than DVID_UP_END_THRE.

9:7

DVID_DOWN_END_

THRE

Threshold for the downward DVID ending indicator. During the downward DVID,

the controller uses the output of the first-stage filter as VO_REF. When the current

VO_REF is less than the calculated VID_TARGET + DVID_DOWN_END_THRE,

this bit switches to the output of the second-stage filter

DVID_DOWN_START_THRE must be greater than DVID_DOWN_END_THRE.

6:2

FILT2_CHECK_TIME

Check time of the synchronizing function of the second-stage PWM-VID filter to

improve output voltage accuracy after DVID. 100µs/LSB.

The second-stage PWM-VID filter uses an internal hysteresis module to avoid jitter

on its output. When the output remains unchanged during this checking time, the

hysteresis module synchronizes its output with the input to eliminate small DC

errors.

1:0

SECOND_FIL_AVE

Averaging window of the second-stage PWM-VID filter.

00: average of 512 points

01: average of 1024 points

10: average of 2048 points

11: average of 4056 points

MP2886A Datasheet(PDF) 80 Page - Monolithic Power Systems

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