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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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RT3602AE bảng dữ liệu(PDF) 37 Page - Richtek Technology Corporation |
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RT3602AE bảng dữ liệu(HTML) 37 Page - Richtek Technology Corporation |
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37 / 46 page  37 RT3602AE DS3602AE-00 August 2017 www.richtek.com © Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Dynamic VID (DVID) Compensation When VID transition event occurs, a charge current will be generated in the loop to cause DVID performance is deteriorated by this induced charge current, the phenomenon is called droop effect. The droop effect is shown in Figure 21. When VID up transition occurs, the output capacitor will be charged by inductor current. Since current signal is sensed in inductor, an induced charge current will appear in control loop. The induced charge current will produce a voltage drop in R1 to cause output voltage to have a droop effect. Due to this, VID transition performance will be deteriorated. The RT3602AE provides a DVID compensation function. By the DVID compensation to cancel the real induced charge current signal and the virtual charge current signal is defined in Figure 22. Figure 23 shows the operation of cancelling droop effect. A virtual charge current signal is established first and then VID signal plus virtual charge current signal to be generated on the FB pin. Hence, an induced charge current signal flows to R1 and is cancelled to reduce droop effect. Figure 21. Droop Effect in VID transition VIN Gate Driver Q1 Q2 L RESR CO2 CPU C2 Charge current Induced charge current signal CO1 Ai R1 R2 C1 + - EA + - COMP CCRCOT tON VID Transition IDROOP VID Output voltage VIN VID Figure 22. Definition of Virtual Charge Current Signal DVID_Threshold DVID_Width VIN Gate Driver Q1 Q2 L RESR CO2 CPU C2 Charge current Induced charge current signal CO1 Ai R1 R2 C1 + - EA + - COMP CCRCOT tON VID Transition IDROOP VID Output voltage VIN VID Virtual Charge Current Slew Rate Control Virtual Charge Current Generator + DVID Event Figure 23. DVID Compensation |
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