參數(shù)資料
型號(hào): PM6670
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 1.4 A SWITCHING CONTROLLER, QCC24
封裝: 4 X 4 MM, LEAD FREE, VFQFN-24
文件頁數(shù): 18/53頁
文件大?。?/td> 799K
代理商: PM6670
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
PM6670
Device description
25/53
Figure 32. "Virtual-ESR" Network
The ripple on the COMP pin is the sum of the output voltage ripple and the triangular ripple
generated by the Virtual-ESR Network. In fact the Virtual-ESR Network behaves like a
another equivalent series resistor RVESR.
A good trade-off is to design the network in order to achieve an RVESR given by:
Equation 11
where
I
L is the inductor current ripple and VRIPPLE is the total ripple at the T node, chosen
greater than approximately 20mV.
The new closed-loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 12
where:
Equation 13
and:
COMP
VSNS
C
CINT
INT
R
RINT
INT
C
CFILT
FILT
t
VREF
C
COUT
OUT
COMP PIN
VOLTAGE
OUTPUT
VOLTAGE
C
R
R11
t
T
T NODE
VOLTAGE
V
V2
ESR
V1
+
-
V
VREF
REF
- g
gm
m
R
RFb1
Fb1
R
RFb2
Fb2
Vr
+
PWM
Comparator
I=gm(V1-Vr)
V
V11
ESR
I
V
R
L
RIPPLE
VESR
=
Vout
Vr
f
2
g
C
Z
m
INT
π
>
TOT
out
Z
R
C
2
1
f
π
=
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