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STPM098C 数据表(PDF) 85 Page - STMicroelectronics |
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STPM098C 数据表(HTML) 85 Page - STMicroelectronics |
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85 / 110 page  Figure 71. T_on time with MULTI_PULSE_STRAT = 0x02 MIN TOFF DVCO Pulse PWM Behavior during TON generation Additional DVCO pulses skipped during TON Behavior during TOFF generation New TON generated after minimum TOFF MULTI_PULSE_STRAT= 0x03 Pulse merger skips DCO pulses received during the nominal ON time itself as well as DCO pulses received during the minimum TOFF window. Figure 72. T_on time with MULTI_PULSE_STRAT = 0x03 MIN TOFF DVCO Pulse PWM Behavior during TON generation Additional DVCO pulses skipped during TON Behavior during TOFF generation Additional DVCO pulses skipped during minimum TOFF 3.14.7 Efficiency enhancement 3.14.7.1 Dynamic phase shedding (DPS) In order to maximize conversion efficiency over the whole load range, the STPM098C loop controller allows the possibility to automatically adjust the number of active phases among the available subset defined by phase assignment programming. Active phases are added/dropped basing on the comparison between the converted load current level measurement and a programmable threshold thus optimizing efficiency over the whole load range. If Σj=1mISENj−CFILTVREF1 ≥PHASEn_ADD_THoccursforanintervallongerthanIOUTADCconversionlatency,the n-th phase contribution is added to the control loop (n-th PWM enabled, ISENn monitor enabled). If Σj=1mISENj−CFILTVREF1 ≤PHASEn_DROP_THoccursforanintervallongerthanIOUTADCconversionlatency plus the configured DROP_DELAY, the n-th phase contribution is dropped from the control loop (n-th PWM disabled (HIZ), ISENn monitor disabled). The DPS add/drop thresholds can be programmed through a dedicated PMBus™ register as follows: PHASE2ADDTH=ΔLSB×MFRPHASE2ADDCFG7:0 (51) PHASE2DROPTH=ΔLSB×MFRPHASE2DROPCFG7:0 (52) PHASE3ADDTH=ΔLSB×MFRPHASE3ADDCFG7:0 (53) PHASE3DROPTH=ΔLSB×MFRPHASE3DROPCFG7:0 (54) PHASE4ADDTH=ΔLSB×MFRPHASE4ADDCFG7:0 (55) PHASE4DROPTH=ΔLSB×MFRPHASE4DROPCFG7:0 (56) STPM098C Functional description DS14440 - Rev 1 page 85/110 |
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