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MP2884A Datasheet(PDF) 92 Page - Monolithic Power Systems

No. de pieza MP2884A
Descripción Electrónicos  Digital, Multi-Phase PWM Controller with PMBus and PWM-VID
PDF  107 Pages
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Fabricante Electrónico  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP2884A Datasheet(HTML) 92 Page - Monolithic Power Systems

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MP2884A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID
MP2884A Rev. 1.01
www.MonolithicPower.com
92
12/25/2018
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
Calculate the slope compensation slew rate with Equation (31):

SW
SLOPE@3P
BLANK
T
0.25(μA) CURRENT_SOURCE
V(
T
)
( 16 - CAP ) 1.85(pF)
3
(31)
Where VSLOPE@3P is the desired slope compensation voltage for 3-phase status, TSW is the PWM period
determined by register MFR_FS (BDh), and TBLANK is SLOPE_BLANK_TIME set in register
MFR_BLANK_TIME (C5h).
If setting VDIFF_GAIN_SEL (2Ah) = 1 to get a half gain for the remote sense amplifier, VSLOPE should
be doubled.
MFR_SLOPE_CNT_3P (D7h)
This register sets the maximum slope compensation ramping time for 3-phase status. Once the timer is
over, the current source turns off, and the slope compensation voltage is held.
Command
MFR_SLOPE_CNT_3P
Format
Unsigned binary
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
x
x
x
x
x
x
SLOPE_CNT
Bits
Bit Name
Description
15:8
RESERVED
Unused. X indicates that writes are ignored and reads are always 0.
7:0
SLOPE_CNT
Maximum ramping time of slope compensation for 3-phase status. 5ns/LSB.

SW
BLANK
T
1.3 (
T
)(ns)
3
SLOPE _ CNT
5(ns)
Where TSW is the PWM period determined by register MFR_FS (BDh), and
TBLANK is SLOPE_BLANK_TIME set in register MFR_BLANK_TIME (C5h).
MFR_SLOPE_SR_2P (D8h)
This register sets the slope compensation slew rate for 2-phase status.
Command
MFR_SLOPE_SR_2P
Format
Unsigned binary
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Access
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
r/w
Function
x
x
x
x
x
x
CAP
CURRENT_SOURCE
Bits
Bit Name
Description
15:10
RESERVED
Unused. X indicates that writes are ignored and reads are always 0.
9:6
CAP
Capacitor value for slope compensation. 1.85pF/LSB.
5:0
CURRENT_SOURCE
Current source value for slope compensation. 0.25µA/LSB.



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