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RT3624LE Datasheet(PDF) 34 Page - Richtek Technology Corporation |
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RT3624LE Datasheet(HTML) 34 Page - Richtek Technology Corporation |
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34 / 48 page  RT3624LE Copyright © 2022 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation www.richtek.com DS3624LE-00 April 2022 34 ISENxP ISENxN RX1 CX VGTUS + - RCSx=680ohm ILx Gm ICS,PERx ICBx IZDx IOCx IIMONx + - VCSIN RX2 Option LX DCR Figure 9. Inductor DCR Current Sensing Method for GTUS/VCCSA LX DCR RX1 CX VAUX + - ILx Gm + - VCSIN IMON_AUX RX2 Option ISENP_AUX ISENN_AUX ICS_AUX Figure 10. Inductor DCR Current Sensing Method for AUX Lx R C = xx DCRx × Lx R C < xx DCRx × Lx R C > xx DCRx × Sluggish droop Undershoot created in VOUT VOUT VIMON OUT LL I x R ∆ OUT I ∆ Ideal load transient waveform VOUT VIMON OUT LL I x R ∆ OUT I ∆ VOUT VIMON OUT LL I x R ∆ OUT I ∆ Figure 11. All Kinds of RC Network Time Constant Total Current Sense/ICCMAX Setting/Current Monitoring To compensate DCR positive temperature coefficient, conventional current sense method needs an NTC resistor for per phase current loop. The RT3624LE adopts a patented total current sense method that requires only one NTC resistor for thermal compensation. The NTC resistor is designed within IMON resistor network on IMON pin. It is suggested to be placed near the inductor of the first phase. Figure 12 shows the configuration. All phase current signals are gathered to IMON pin and converted to a voltage signal VIMON by RIMON,EQ based on VREF pin. The VREF pin provides 0.6V voltage source (as presented as VVREF) during normal operation. The relationship between VIMON and inductor current ILx is : |
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