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PM6681ATR Datasheet(PDF) 37 Page - STMicroelectronics

Part # PM6681ATR
Description  Dual synchronous step-down controller with adjustable LDO
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6681ATR Datasheet(HTML) 37 Page - STMicroelectronics

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PM6681A
Design guidelines
37/47
where
∆I
L is the inductor current ripple and VRIPPLE is the overall ripple of the T node
voltage. It should be chosen higher than approximately 30 mV.
The new closed loop gain depends on CINT. In order to ensure stability it must be verified
that:
Equation 30
Where:
Equation 31
where RTOT is the sum of the ESR of the output capacitor Rout and the equivalent ESR
given by the virtual ESR network RESR.
Moreover CINT must meet the following condition:
Equation 32
Where k is a free design parameter greater than 3 and determines the minimum integrator
capacitor value CINT:
Equation 33
C must be selected as shown:
Equation 34
R must be chosen in order to have enough ripple voltage on integrator input:
Equation 35
R1 can be selected as follows:
OUT
Z
m
INT
V
Vr
f
2
g
C
×
×
π
>
TOT
out
Z
R
C
2
1
f
×
×
π
=
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
>
INT
C
5
C
×
>
C
R
L
R
ESR ×
=



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