RT3624LE datasheet(40/48 Pages) RICHTEK

40 / 48 page

RT3624LE

is a registered trademark of Richtek Technology Corporation

www.richtek.com

DS3624LE-00

April

2022

Adaptive Quick Response (AQR)

The RT3624LE adopts Adaptive Quick Response

(AQR) to optimize transient response. The mechanism

is illustrated in Figure 19. Controller detects output

voltage drop slew rate. While the slew rate exceeds the

AQR threshold, all PWMs turn on for 53.3% of TON.

The RT3624LE provides

various

AQR

threshold

through PIN-SETTING of AQR_TH. The following

equation can initially decide the AQR starting trigger

threshold. Note that the threshold should be larger than

steady-state output voltage ripple falling slew rate and

also the overshoot falling slew rate to avoid miss trigger

AQR.

dVSEN

AQR Starting Trigger Threshold =

−×

Output voltage

VBIAS

AQR Threshold

Vdiff

PWM_AQR

Figure 19. Adaptive Quick Response Mechanism

Table 14. PIN-SETTING of AQR_TH

AQR_TH[2:0]

AQR Starting Trigger Threshold

(mV)

000

720

001

880

010

1040

011

1200

100

1360

101

1520

110

1680

111

Disable

Anti-overshoot (ANTI-OVS)

The RT3624LE provides anti-overshoot function to

suppress output voltage overshoot. Controller detects

overshoot by signals related to output voltage. The

overshoot

trigger

level

can

adjusted

PIN-SETTING as listed in Table 15. The main detecting

signal

comes

from

COMP.

However,

COMP

characteristic varies with compensation. Initial trigger

level setting is based on the following equation :

∆COMP×

=∆VSEN×

REA2

REA1

Anti-overshoot Threshold of ANTIOVS_TH[1:0]

The final setting should be determined according to

actual

Error

AMP

compensator

design

and

measurement.

While overshoot exceeds the set trigger level, all

PWMs keep in tri-state until the zero current is detected

or VSEN returns to normal level. Turning off LGs forces

positive current flow through body diode to cause diode

forward voltage drop. The extra forward voltage can

speed up inductor current discharge and decrease

overshoot.

Table 15. PIN-SETTING of Anti-Overshoot

Threshold

ANTIOVS_TH[1:0]

Anti-overshoot

Threshold (mV)

150

210

Disable

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