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RT6310A/AH 数据表(PDF) 42 Page - Richtek Technology Corporation

部件名 RT6310A/AH
功能描述  10A, 23V Synchronous Step-Down Converter with 3.3V/5V LDO
PDF  54 Pages
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制造商  RICHTEK [Richtek Technology Corporation]
网页  http://www.richtek.com
标志 RICHTEK - Richtek Technology Corporation

RT6310A/AH 数据表(HTML) 42 Page - Richtek Technology Corporation

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RT6310
Copyright © 2023 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
DS6310-04
August 2023
42
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.
FB
VOUT
RT6310A/AH
RT6310D/DH
R1
CFF
R2
AGND
Figure 16. RT6310A/AH/D/DH Feedback Loop with
Feedforward Capacitor
FF
RT6310C/CH
CFF
VOUT
R1
R2
AGND
VOUT
80k
Ω
40k
Ω
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).
(
)
FB
FF
OUT
FF
s
1 +
1
V
(s)
R1 C
1
=
(1)
R1
s
V
(s)
1 +
1 +
1
R2
R1//R2
C
P
FF
1
f =
(2)
2
R1//R2 C
 
Z
FF
1
f =
(3)
2
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
1
10
10 0
1 10
3
1 10
4
1 10
5
1 10
6
30
−
25
−
20
−
15
−
10
−
5
−
0
5
10
1
10
10 0
1 10
3
1 10
4
1 10
5
1 10
6
0
50
10 0
Frequency(Hz)
Frequency(Hz)
W/ Cff
W/O Cff
W/ Cff
W/O Cff



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