参数资料
型号: PM6670STR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 3 A SWITCHING CONTROLLER, QCC24
封装: 4 X 4 MM, LEAD FREE, VFQFPN-24
文件页数: 44/54页
文件大小: 742K
代理商: PM6670STR
PM6670S
Application information
Doc ID 14432 Rev 4
49/54
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, becomes a low pass filter. The cutoff frequency fCUT 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), an additional 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 43.
Figure 43.
Virtual ESR network
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
+
-
+
-
0.9V
VDDQ
Ton
Generation
Block
C
R
R1
L
Integrator
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