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MP2884A Datasheet(PDF) 88 Page - Monolithic Power Systems |
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MP2884A Datasheet(HTML) 88 Page - Monolithic Power Systems |
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88 / 107 page  MP2884A – DIGITAL PWM CONTROLLER WITH PMBUS AND PWM-VID MP2884A Rev. 1.01 www.MonolithicPower.com 88 12/25/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2018 MPS. All Rights Reserved. Bits Bit Name Description 15:8 RESERVED Unused. X indicates that writes are ignored and reads are always 0. 7:0 RESERVED Unused. X indicates that writes are ignored and reads are always 0. MFR_SLOPE_SR_7P (CEh) This register sets the slew rate of slope compensation for 7-phase status. Command MFR_SLOPE_SR_7P 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 x x x Bits Bit Name Description 15:9 RESERVED Unused. X indicates that writes are ignored and reads are always 0. 8:6 RESERVED Unused. X indicates that writes are ignored and reads are always 0. 5:0 RESERVED Unused. X indicates that writes are ignored and reads are always 0. Calculate the slope compensation slew rate with Equation (27): SW SLOPE@7P BLANK T 0.25(μA) CURRENT_SOURCE V( T ) ( 8 - CAP ) 1.85(pF) 7 (27) Where VSLOPE@7P is the desired voltage of slope compensation for 7-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_7P (CFh) This register sets the maximum ramping time of slope compensation for 7-phase status. Once the timer is over, the current source turns off, and the slope compensation voltage is held. Command MFR_SLOPE_CNT_7P 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 x x x Bits Bit Name Description 15:8 RESERVED Unused. X indicates that writes are ignored and reads are always 0. 7:0 RESERVED Unused. X indicates that writes are ignored and reads are always 0. |
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