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PM6675STR bảng dữ liệu(PDF) 48 Page - STMicroelectronics

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PM6675STR bảng dữ liệu(HTML) 48 Page - STMicroelectronics

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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
C
INT
filt
−
⋅
=
FILT
INT
FILT
INT
CUT
INT
C
C
C
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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