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ISL6277HRZ Datasheet(PDF) 19 Page - Intersil Corporation |
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ISL6277HRZ Datasheet(HTML) 19 Page - Intersil Corporation |
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19 / 37 page  ISL6277 19 FN8270.1 March 8, 2012 Modes of Operation The Core VR can be configured for 3, 2- or 1-phase operation. Table 1 shows Core VR configurations and operational modes, programmed by the ISEN3 and ISEN2 pin status and the PSL0_L & PSL1_L commands via the SVI 2 interface, see Table 9. For a 2-phase configuration, tie the ISEN3 pin to 5V. In this configuration, phases 1 and 2 are active. To select a 1-phase configuration, tie the ISEN3 pin and the ISEN2 pin to 5V. In this configuration, only phase-1 is active. In a 3-phase configuration, the Core VR operates in 3-phase CCM, with PSI0_L and PSI_L both high. If PSI0_L is taken low via the SVI 2 interface, the Core VR sheds Phase 2 and Phase 3. Phase 1 enters Diode Emulation (DE) mode. When both PSI0_L and PSI1_L are taken low, the Core VR continues to operate in 1-phase DE mode. For 2-phase configurations, the Core VR operates in 2-phase CCM with PSI0_L and PSI_L both high. If PSI0_L is taken low via the SVI 2 interface, the Core VR sheds Phase 2 and the Core VR enters 1-phase DE mode. When both PSI0_L and PSI1_L are taken low, the Core VR continues to operate in 1-phase DE mode. In a 1-phase configuration, the Core VR operates in 1-phase CCM and enters 1-phase DE when PSI0_L is taken low and continues to operate in this mode when both PSI0_l and PSI1_L are taken low. The Core VR can be disabled completely by connecting ISEN1 to +5V. ISL6277 Northbridge VR can be configured for 2- or 1-phase operation. Table 2 shows the Northbridge VR configurations and operational modes, which are programmed by the ISEN2_NB pin status and the PSI0_L and PSI1_L bits of the SVI 2 command. FIGURE 17. CURRENT BALANCING DURING DYNAMIC OPERATION. CH1: IL1, CH2: ILOAD, CH3: IL2, CH4: IL3 REP RATE = 10kHz REP RATE = 25kHz REP RATE = 50kHz REP RATE = 100kHz REP RATE = 200kHz TABLE 1. CORE VR MODES OF OPERATION CONFIG. ISEN3 ISEN2 PSL0_L & PSI1_L MODE OCP THRESHOLD (µA) 3-phase Core VR Config. To Power Stage To Power Stage 11 3-phase CCM 45 01 1-phase DE 00 1-phase DE 2-phase Core VR Config. Tied to 5V To Power Stage 11 2-phase CCM 45 01 1-phase DE 00 1-phase DE 1-phase Core VR Config. Tied to 5V Tied to 5V 11 1-phase CMM 45 01 1-phase DE 00 1-phase DE TABLE 2. NORTHBRIDGE VR MODES OF OPERATION ISEN2_NB CONFIG. PSL0_L & PSI1_L MODE OCP THRESHOLD To Power Stage 2-phase NB VR Config. 11 2-phase CCM 45µA 01 1-phase DE 00 1-phase DE Tied to 5V 1-phase NB VR Config. 11 1-phase CCM 45µA 01 1-phase DE 00 1-phase DE |
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