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PM6670STR データシート(PDF) 47 Page - STMicroelectronics

部品番号 PM6670STR
部品情報  Complete DDR2/3 memory power supply controller
PDF  53 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6670STR データシート(HTML) 47 Page - STMicroelectronics

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PM6670S
Application information
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8.1.7
All ceramic capacitors application
Design of external feedback network depends on the output voltage ripple across the output
capacitors' ESR. If the ripple is great enough (at least 20 mV), the compensation network
simply consists of a CINT capacitor.
Figure 42.
Integrative compensation
The stability of the system depends firstly on the output capacitor zero frequency. It must be
verified that:
Equation 48
where k is a free design parameter greater than unity (k > 3) . It determines the minimum
integrator capacitor value CINT:
Equation 49
CFILT
CINT
RINT
gm
+
-
Vr=0.9
VSNS
Ton One-shot
generator
VREF
PWM
Comparator
+
-
COMP
VDDQ
Integrator
out
out
Zout
SW
C
R
2
k
f
k
f
⋅
π
=
⋅
>
Vo
Vref
f
k
f
2
g
C
Zout
SW
m
INT
⋅
⎟
⎠
⎞
⎜
⎝
⎛
−
⋅
π
>



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