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參數(shù)資料
| 型號： | PM6675ASTR |
| 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)： | 38/48頁 |
| 文件大小： | 2481K |
| 代理商： | PM6675ASTR |
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PM6675AS
Application information
43/48
where k is a free design parameter greater than unity (k > 3) . It determinates the minimum
integrator capacitor value CINT:
Equation 49
If the ripple on pin COMP is greater than the integrator output dynamic (150 mV), an
additional capacitor Cfilt could be added in order to reduce its amplitude. If q is the desired
attenuation factor of the output ripple, select:
Equation 50
In order to reduce noise on pin COMP, it’s possible to introduce a resistor RINT that, together
with CINT and Cfilt, realizes a low pass filter. The cutoff frequency must be much greater (10
or more times) than the switching frequency of the section:
Equation 51
For most of 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 40.
Figure 40.
Virtual ESR network
Vo
Vref
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
=
VREF
CFILT
CINT
RINT
PWM Comparator
gm
+
-
+
-
0.6V
VOUT
Ton
Generation
Block
C
R
R1
L
Integrator
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