參數(shù)資料
型號: PM6670AS
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): 42/53頁
文件大小: 745K
代理商: PM6670AS
PM6670AS
Application information
Doc ID 14436 Rev 2
47/53
8.1.7
All ceramic capacitors application
Design of external feedback network depends on the output voltage ripple across the output
capacitors' ESR. If the ripple is great enough (at least 20 mV), the compensation network
simply consists of a CINT capacitor.
Figure 40.
Integrative compensation
The stability of the system depends firstly on the output capacitor zero frequency. It must be
verified that:
Equation 48
where k is a free design parameter greater than unity (k > 3). It determines the minimum
integrator capacitor value CINT:
Equation 49
CFILT
CINT
RINT
gm
+
-
Vr=0.9
VSNS
Ton One-shot
generator
VREF
PWM
Comparator
+
-
COMP
VDDQ
Integrator
out
Zout
SW
C
R
2
k
f
k
f
π
=
>
Vo
Vref
f
k
f
2
g
C
Zout
SW
m
INT
π
>
相關(guān)PDF資料
PDF描述
PM6670A 1.4 A SWITCHING CONTROLLER, QCC24
PM6670STR 3 A SWITCHING CONTROLLER, QCC24
PM6670S 3 A SWITCHING CONTROLLER, QCC24
PM6670TR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670ATR 1.4 A SWITCHING CONTROLLER, QCC24
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