參數(shù)資料
型號： PM6680ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, LEAD FREE, VFQFPN-32
文件頁數(shù)： 31/48頁
文件大?。?/td> 1932K
代理商： PM6680ATR
PM6680A
Design guidelines
37/48
Figure 37.
Virtual ESR network
The T node voltage is the sum of the output voltage and the triangular waveform generated
by the virtual ESR network. In fact the virtual ESR network behaves like a further equivalent
ESR.
A good trade-off is to design the network in order to achieve an RESR given by:
Equation 28
where
IL is the inductor current ripple and V
RIPPLE is the overall ripple of the T node
voltage. It should be chosen higher than approximately 30 mV.
The new closed loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 29
Where:
COMP
OU
T
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP pin
voltage
L
D
Output
voltage
C
R
R1
t
T
T node
voltage
V
V1
R
ROUT
OUT
V1
+
-
Vr
-
gm
Vr
+
PWM
Comparator
V1
FB
R
R1
1
R
R2
2
COMP
OU
T
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
Vr
C
COUT
OUT
COMP pin
voltage
L
D
Output
voltage
C
R
R1
t
T
T node
voltage
V
V1
R
ROUT
OUT
V1
+
-
Vr
--
gm
Vr
+
PWM
Comparator
V1
FB
R
R1
1
R
R2
2
R
R1
1
R
R2
2
out
L
RIPPLE
ESR
R
I
V
R
=
OUT
Z
m
INT
V
Vr
f
2
g
C
×
π
>
相關(guān)PDF資料
PDF描述
PM6680A 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
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