STPM098C datasheet(88/110 Pages) STMICROELECTRONICS

88 / 110 page

Where:

N is the number of active phases.

TNOMINAL is the switching period programmed in TSWITCH.

Phase boost can be disabled by a dedicated PMBus™ bit as follows:

Table 69. Phase boosting enable bit

DISABLE_DPM_PROT

Description

Phase boosting enabled (default)

Phase boosting disabled

Note:

•

DPS disabling can be achieved by setting PHASEn_ADD_TH = 0x00 only while DPS enabling need to

properly set both PHASEn_ADD_TH and PHASEn-DROP.

•

For Loop 1:

–

PHASE2_ADD_TH is the current threshold above which phase 2 is added to phase 1

–

PHASE3_ADD_TH is the current threshold above which phase 3 is added to phase 1/2

–

PHASE4_ADD_TH is the current threshold above which phase 4 is added to phase 1/2/3

–

PHASE5_ADD_TH is the current threshold above which phase 5 is added to phase 1/2/3/4

–

PHASE6_ADD_TH is the current threshold above which phase 6 is added to phase 1/2/3/4/5

–

PHASE7_ADD_TH is the current threshold above which phase 7 is added to phase 1/2/3/4/5/6

–

PHASE8_ADD_TH is the current threshold above which phase 8 is added to phase 1/2/3/4/5/6/7

•

For Loop 2:

–

PHASE8_ADD_TH is the current threshold above which phase 7 is added to phase 8

–

PHASE7_ADD_TH is the current threshold above which phase 6 is added to phase 8/7

–

PHASE6_ADD_TH is the current threshold above which phase 5 is added to phase 8/7/6

•

PHASEn_DROP_TH is the current threshold below which a phase is dropped following the reverse

scheme depicted above for the two loops.

•

Unused phases shall be configured with PHASEn_ADD_TH = 0xFF.

•

Unused loops or used loops with no DPM requirements shall be configured with PHASEn_ADD_TH =

0x00 on all assigned phases.

Example 1:

PHASE_CFG=0x15

Loop 1 uses phases 1:5 (phase 6 unused)

Loop 2 uses phase 1_L2:2_L2

DPM is active on both loops

PHASE2_ADD_TH = Iload1

PHASE3_ADD_TH = Iload2

PHASE4_ADD_TH = Iload3

PHASE5_ADD_TH = Iload4

PHASE6_ADD_TH = 0xFF

PHASE7_ADD_TH = 0xFF

PHASE8_ADD_TH = 0xIload5

STPM098C

Functional description

DS14440 - Rev 1

page 88/110

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