參數(shù)資料
型號: 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): 42/53頁
文件大小: 799K
代理商: PM6670
Obsolete
Product(s)
- Obsolete
Product(s)
Obsolete
Product(s)
- Obsolete
Product(s)
PM6670
Application information
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 20mV), the compensation network
simply consists of a CINT capacitor.
Figure 42. 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
>
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PM6670S 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK
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