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PM6675STR Datasheet(PDF) 47 Page - STMicroelectronics

Part # PM6675STR
Description  High efficiency step-down controller with embedded 2 A LDO regulator
PDF  53 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675STR Datasheet(HTML) 47 Page - STMicroelectronics

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PM6675S
Application information
47/53
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 49.
Integrative compensation
The stability of the system firstly depends on the output capacitor zero frequency. It must be
verified that:
Equation 49
where k is a free design parameter greater than unity (k > 3) . It determines the minimum
integrator capacitor value CINT:
Equation 50
If the ripple on the COMP pin 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:
CFILT
CINT
RINT
gm
+
-
VREF
VSNS
Ton One-shot
generator
Vr=0.9
V
PWM
Comparator
+
-
COMP
VOUT
Integrator
VREF
0.6V
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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