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PM6670STR Scheda tecnica(PDF) 49 Page - STMicroelectronics

Il numero della parte PM6670STR
Spiegazioni elettronici  Complete DDR2/3 memory power supply controller
PDF  53 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6670STR Scheda tecnica(HTML) 49 Page - STMicroelectronics

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PM6670S
Application information
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Select C as shown:
Equation 52
Then calculate R in order to have enough ripple voltage on the integrator input:
Equation 53
Where RVESR 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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