MP2884A datasheet(77/107 Pages) MPS

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MP2884A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID

MP2884A Rev. 1.01

www.MonolithicPower.com

12/25/2018

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

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 for 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

MFR_PWMVID_FLTR_CTRL2 (B2h)

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

Command

MFR_PWMVID_FLTR_CTRL2

Format

Unsigned binary

Bit

Access

r/w

Function

Bits

Bit Name

Description

DVID_TRIG_MODE

DVID trigger mode selector.

0: according to the relationship between the calculated VID_TARGET and

current VO_REF

1: according to whether the real-time counted PWM-VID on-time changes more

than the threshold set in bit[5:3] or bit[2:0]

FILT2_SYNC_EN

Enable bit for the synchronizing function of the second stage PWM-VID filter to

improve output voltage accuracy after DVID.

0: disable

1: enable

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

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

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

DC errors.

13:10

DVID_DOWN_THRE

DVID direction identification threshold for downward DVID. When the current

VO_REF is greater than VID_TARGET + DVID_DOWN_THRE, the controller

considers the DVID to be downward.

9:6

DVID_UP_THRE

DVID direction identification threshold for upward DVID. When the current

VO_REF is less than VID_TARGET - DVID_UP_THRE, the controller considers

the DVID to be upward.

5:3

TON_CHANGE_THRE_

Threshold for the downward DVID starting indicator (DVID_TRIG_MODE = 1).

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

VO_REF. When the detected on-time negative variation of PWM-VID is greater

than TON_CHANGE_THRE_N, the controller enters downward DVID, and

VO_REF switches to the first- stage filter output. 5ns/LSB.

2:0

TON_CHANGE_THRE_

Threshold for the upward DVID starting indicator (DVID_TRIG_MODE = 1).

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

VO_REF. When the detected on-time positive variation of PWM-VID is greater

than TON_CHANGE_THRE_P, the controller enters upward DVID, and VO_REF

switches to the first-stage filter output. 5ns/LSB.

MP2884A Datasheet(PDF) 77 Page - Monolithic Power Systems

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