參數(shù)資料
型號(hào): PM6670S
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 3 A SWITCHING CONTROLLER, QCC24
封裝: 4 X 4 MM, LEAD FREE, VFQFPN-24
文件頁數(shù): 20/54頁
文件大?。?/td> 742K
代理商: PM6670S
PM6670S
Device description
Doc ID 14432 Rev 4
27/54
Equation 14
Moreover, the CINT capacitor must meet the following condition:
Equation 15
where RTOT is the sum of the ESR of the output capacitor and the equivalent ESR given by
the Virtual-ESR Network (RVESR). The k parameter must be greater than unity (k > 3) and
determines the minimum integrator capacitor value CINT:
Equation 16
The capacitor of the virtual-ESR Network, C, is chosen as follows:
Equation 17
and R is calculated to provide the desired triangular ripple voltage:
Equation 18
Finally the R1 resistor is calculated according to expression 19:
Equation 19
RTOT = ESR + RVESR
TOT
out
Z
SW
R
C
2
k
f
k
f
π
=
>
Vout
Vr
f
k
f
2
g
C
Z
SW
m
INT
π
>
INT
C
5
C
>
C
R
L
R
VESR
=
Z
f
C
1
R
f
C
1
R
1
R
π
π
=
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