RT6310CSLASHCH datasheet(42/54 Pages) RICHTEK

42 / 54 page

RT6310

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS6310-04

August 2023

capacitor CFF is used in the feedback loop to improve

transient response, as shown in Figure 16 and Figure

17. Figure 18 shows the comparison result of bode plot

with different feedback loop conditions. Referring to

Figure 18, through connecting a CFF in feedback

network, the gain and phase are raised in mid-

frequency, which not only extends the bandwidth, but

also boosts the phase margin. Moreover, there is also a

high frequency pole to eliminate high frequency noise.

Consequently, those features of feedforward feedback

network allow the RT6310 to have faster response to

different load transients.

VOUT

RT6310A/AH

RT6310D/DH

CFF

AGND

Figure 16. RT6310A/AH/D/DH Feedback Loop with

Feedforward Capacitor

RT6310C/CH

CFF

VOUT

AGND

VOUT

80k

40k

Figure 17. RT6310C/CH Feedback Loop with

Feedforward Capacitor

Figure 18. Bode Plot with Different Feedback Loop Conditions

The transfer function of feedforward network is

expressed in equation (1) and the positions of zero and

pole are calculated in equation (2) and equation (3).

(

)

OUT

1 +

(s)

R1 C

(1)

(s)

1 +

R1//R2



f =

(2)

R1//R2 C

 

f =

(3)

R1 C

 

According to Figure 18, the maximum phase boost that

occurs between zero and pole frequencies is defined as

maximum phase boost frequency, as expressed in

equation (4). Hence, in order to achieve the maximum

10 0

1 10



1 10



1 10



1 10



−

10 0

1 10



1 10



1 10



1 10



10 0

Frequency(Hz)

W/ Cff

W/O Cff

W/ Cff

W/O Cff

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