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PM6685 Datasheet(PDF) 41 Page - STMicroelectronics

Part # PM6685
Description  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685 Datasheet(HTML) 41 Page - STMicroelectronics

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PM6685
Monitoring and protections
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Equation 27
The following condition should be satisfied:
Equation 28
Where k is a free design parameter greater than 3 and determines the minimum integrator
capacitor value CINT:
Equation 29
In order to ensure stability it must be also verified that:
Equation 30
C must be selected as shown:
Equation 31
R must be chosen in order to have enough ripple voltage on integrator input:
out
ESR
TOT
R
R
R
+
=
TOT
out
Z
sw
R
C
2
k
f
k
f
×
×
π
=
×
>
OUT
Z
sw
m
INT
V
Vr
f
k
f
2
g
C
×
⎟
⎠
⎞
⎜
⎝
⎛
−
×
π
>
OUT
Zout
m
INT
V
Vr
f
2
g
C
×
×
π
>
INT
C
5
C
×
>



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