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RT3602AE Datasheet(PDF) 37 Page - Richtek Technology Corporation

Part # RT3602AE
Description  Triple Channel PWM Controller for IMVP8 Mobile CPU Core Power Supply
PDF  46 Pages
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Manufacturer  RICHTEK [Richtek Technology Corporation]
Direct Link  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT3602AE Datasheet(HTML) 37 Page - Richtek Technology Corporation

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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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