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參數(shù)資料
| 型號： | PM6652TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32 |
| 文件頁數(shù)： | 39/53頁 |
| 文件大小： | 2519K |
| 代理商： | PM6652TR |
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Application ideas
PM6652
44/53
Doc ID 16867 Rev 3
9
Application ideas
9.1
Load transient response improvement with feedback
capacitor
Referring to Figure 2 on page 7, the droop gain network made by R14, R15, R17 and R18
can be improved by adding the feedback capacitor C34. So doing the performed load line,
starting from Equation 8, can be computed again:
Equation 31
The sensed current information is still given by:
Equation 32
By joining the two previous results, the complete droop equation becomes:
Equation 33
In order to get an almost flat droop function, from DC to high frequency, and a “squared”
load transient response, the above equation requires two conditions:
●
C34*R17=L/RDCR
●
C34*R17//R14=C15*RA//RB
If R17>R14 (typical application), C15*RA//RB< L/RDCR so the high frequency sensed current
is bigger compared to what can be sensed when the feedback capacitor is not mounted.
This feature can be very helpful when low DCR inductors are used and the sensed current
ripple, CSNS-VOUT, is lower than about 10 mVPP.
In order to avoid any output voltage undershoots during load transient the above mentioned
conditions should be translated into:
●
C34*R17≥L/RDCR
●
C15*RA//RB≥C34*R17//R14
The two components used to fine tune the load transient response are C34 and C15, since
the other components are fixed when the droop is programmed and the inductor has already
been selected.
()
s
R
C
s
1
R
//
R
C
s
1
R
1
s
R
s
G
s
R
SNS
17
34
14
17
34
14
17
SNS
D
DROOP
+
+
+
=
=
()
() ()
34
33
B
31
A
L
SNS
L
15
B
A
DCR
B
A
B
OUT
SNS
R
s
i
s
R
s
i
C
R
//
R
s
1
R
sL
1
R
V
C
+
=
=
+
+
=
B
A
15
DCR
17
34
14
17
34
DCR
B
A
B
14
17
DROOP
R
//
R
C
s
1
R
sL
1
R
C
s
1
R
//
R
C
s
1
R
1
R
+
+
+
+
+
=
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