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PM6675AS データシート(PDF) 44 Page - STMicroelectronics

部品番号 PM6675AS
部品情報  High efficiency step-down controller with embedded 2 A LDO regulator
PDF  48 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675AS データシート(HTML) 44 Page - STMicroelectronics

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Application information
PM6675AS
44/48
Select C as shown:
Equation 52
Then calculate R in order to have enough ripple voltage on the integrator input:
Equation 53
Where RVERS is the new virtual output capacitor ESR. A good trade-off is to consider an
equivalent ESR of 30-50 m
Ω, even though the choice depends on inductor current ripple.
Then choose R1 as follows:
Equation 54
INT
C
5
C
⋅
>
C
R
L
R
VESR ⋅
=
Z
Z
f
C
1
R
f
C
1
R
1
R
π
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
π
⋅
=



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