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)： 18/53頁
文件大小： 2632K
代理商： PM6675STR
PM6675S
Device description
25/53
Equation 7
where gm = 50
s is the integrator trans conductance.
If the ripple on the COMP pin is greater than 150 mV, the auxiliary capacitor CFILT can be
added. If q is the desired attenuation factor of the output ripple, CFILT is given by:
Equation 8
In order to reduce the noise on the COMP pin, it is possible to add 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 9
If the ripple is very small (lower than approximately 20mV), a different compensation
network, called "Virtual-ESR" Network, is needed. This additional circuit generates a
triangular ripple that is added to the output voltage ripple at the input of the integrator. The
complete control scheme is shown in Figure 36.
Vout
Vr
f
k
f
2
g
C
Zout
SW
m
INT
π
>
q
)
q
1
(
C
INT
FILT
=
FILT
INT
FILT
INT
CUT
INT
C
f
2
1
R
+
π
=
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參數(shù)描述
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