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PM6670 Datasheet(PDF) 47 Page - STMicroelectronics

Part # PM6670
Description  Complete DDR2/3 memory power supply controller
PDF  53 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6670 Datasheet(HTML) 47 Page - STMicroelectronics

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PM6670
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 20mV), 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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