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RT3606BC Datasheet(PDF) 49 Page - Richtek Technology Corporation |
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RT3606BC Datasheet(HTML) 49 Page - Richtek Technology Corporation |
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49 / 72 page  49 RT3606BC DS3606BC-04 June 2016 www.richtek.com © Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. VCORE ISEN1P ISEN1N L1 DCR1 R1 C1 + - 680 IL1 ISEN1N ISEN2P ISEN2N L2 DCR2 R2 C2 + - 680 IL2 ISEN2N ISEN3P ISEN3N L3 DCR3 R3 C3 + - 680 IL3 ISEN3N IMON VREF RNTC REQ - 1/3 + 0.6V COMP - + Current Loop Design in Details Figure 24. Current Loop Structure Figure 24 shows the whole current loop structure. The current loop plays an important role in RT3606BC that can decide ACLL performance, DCLL accuracy and ICCMAX accuracy. For ACLL performance, the correct compensator design is assumed, if RC network time constant matches inductor time constant LX / DCRX, an expected load transient waveform can be designed. If RXCX network time constant is larger than inductor time constant LX / DCRX, VCORE waveform has a sluggish droop during load transient. If RXCX network is smaller than inductor time constant LX / DCRX, a worst VCORE waveform will sag to create an undershooting to fail the specification. Figure 25 shows the variety RXCX constant corresponding to the output waveforms. |
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