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PM6675 Datasheet(PDF) 43 Page - STMicroelectronics

Part # PM6675
Description  Very fast load transient response using constant on-time control loop
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6675 Datasheet(HTML) 43 Page - STMicroelectronics

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Then calculate R in order to have enough ripple voltage on the integrator input:
Equation 54
Where RVESR is the new virtual output capacitor ESR. A good trade-off is to consider an
equivalent ESR of 30-50m
Ω , even though the choice depends on inductor current ripple.
Then choose R1 as follows:
Equation 55
C
R
L
R
VESR ⋅
=
C
f
1
R
C
f
1
R
1
R
Z
Z
⋅
⋅
π
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
⋅
⋅
π
⋅
=



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