RT3624LE datasheet(32/48 Pages) RICHTEK

32 / 48 page

RT3624LE

is a registered trademark of Richtek Technology Corporation

www.richtek.com

DS3624LE-00

April

2022

Zero Load-line

The RT3624LE also can support enable zero load-line

function. When zero load-line function is enabled, the

output voltage is determined only by VID and does not

vary with the loading current like load-line system

behavior.

The

RT3624LE

adopts

AC-droop

effectively suppress load transient ring back and

control overshoot for zero load-line application. Figure

7 shows the condition without AC-droop control. The

output voltage without AC-droop control has extra ring

back

∆V2 due to C area charge. Figure 8 shows the

condition with AC-droop control. While loading occurs,

controller changes VID target to short-term voltage

target temporarily. Short-term voltage target is related

transient

current

∆I

and

can

represented as the following :

Short_Term_Voltage_Target=VID-

∆I

CC×RLL

The setting method of RLL is the same as load-line

system. The short-term voltage target reverts to VID

target slowly after a period of time. The short-term

voltage target can help inductor current not to exceed

loading current too much and then the ring back

∆V2

can be suppressed. The overshoot amplitude is

reduced to only

∆V3.

Loading Current ΔIcc

Inductor

current

VID Target

Output Voltage

ΔV1

ΔV3

ΔV2

Figure 7. Zero Load-line without AC-droop Control

RT3624LE Datasheet(PDF) 32 Page - Richtek Technology Corporation

RT3624LE Datasheet(HTML) 32 Page - Richtek Technology Corporation

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