參數(shù)資料
型號: PM6675STR
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): 43/53頁
文件大?。?/td> 2632K
代理商: PM6675STR
Application information
PM6675S
48/53
Equation 51
In order to reduce noise on the COMP pin, it's possible to introduce a resistor RINT that,
together with CINT and Cfilt, becomes a low pass filter. The cutoff frequency fCUT must be
much greater (10 or more times) than the switching frequency:
Equation 52
For most applications both RINT and Cfilt are unnecessary.
If the ripple is very small (e.g. such as with ceramic capacitors), a further compensation
network, called "Virtual ESR" network, is needed. This additional part generates a triangular
ripple that substitutes the ESR output voltage ripple. The complete compensation scheme is
represented in Figure 50.
Figure 50.
Virtual ESR network
Select C as shown:
Equation 53
q
)
q
1
(
C
INT
filt
=
FILT
INT
FILT
INT
CUT
INT
C
f
2
1
R
+
π
=
Vr
CFILT
CINT
RINT
PWM Comparator
gm
+
-
+
-
1.237V
VOUT
Ton
Generation
Block
C
R
R1
L
Integrator
VREF
0.6V
INT
C
5
C
>
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