RT3624LE datasheet(38/48 Pages) RICHTEK

38 / 48 page

RT3624LE

is a registered trademark of Richtek Technology Corporation

www.richtek.com

DS3624LE-00

April

2022

Compensator Design

The compensator of the RT3624LE doesn't need a

complex type II or type III compensator to optimize

control loop performance. It can adopt a simple type I

compensator (one pole, one zero) in the G-NAVPTM

topology to fine tune ACLL performance. The one pole

and one zero compensator is shown in Figure 17. For

IMVP9.1 ACLL specification, it is recommended to

adjust compensator according to load transient ring

back level. Refer to the design tool for default

compensator values.

VID

REA1

REA2

COMP

VSEN

Figure 17. Type I Compensator

Differential Remote Sense Setting

The VR provides differential remote-sense inputs to

eliminate the effects of voltage drops along the PC

board traces, CPU internal power routes and socket

contacts. The CPU contains on-die sense pins,

VCC_SENSE and VSS_SENSE. The related connection is

shown in Figure 18. The VID voltage (DAC) is

referenced to RGND to provide accurate voltage at

remote CPU side. While CPU is not mounted on the

system, two resistors of typical 100

Ω are required to

provide output voltage feedback.

CPU VCC_SENSE

RGND

VID

100

CPU VSS_SENSE

COUT

REA1

CPU

100

VSEN

Figure 18. Remote Sensing Circuit

Switching Frequency Setting

The

RT3624LE G-NAVPTM (Green

Native

AVP)

topology is one kind of current-mode constant on-time

control. It generates an adaptive TON (PWM) with input

voltage (VIN) for better line regulation. The TON is also

adaptive to VID voltage to achieve constant frequency

concept. The constant switching frequency operation

makes the thermal estimation easy. The RT3624LE

provides a parameter setting of kTON to design TON

width. kTON is set by PIN-SETTING of kTON[2:0]. The

related setting table is listed in Table 13.

The equations of TON are listed as below :

VID

≥ 0.93V

Ton=2.206u×

VID

ON∙(VIN)+14ns

VID < 0.93V

Ton=2.05158u×

kTON∙(VIN)

+14ns

Table 13. PIN-SETTING of kTON

kTON[2:0]

kTON

000

0.64

001

0.82

010

011

1.18

100

1.36

101

1.55

110

1.73

111

2.27

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