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PM6685 Datasheet(PDF) 42 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) 42 Page - STMicroelectronics

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Monitoring and protections
PM6685
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Equation 32
R1 can be selected as follows:
Equation 33
Example:
5V section, fSW=200kHz, L=4.7uH, Cout=100uF ceramic (Rout~0
Ω). We design
RESR = 30m
Ω. We choose CINT=1nF by equations 31, 32 and Cfilt=47pF, RINT=1.8KΩ by
eq.26,27. C=6.8nF by Eq.33. Then R=22K
Ω (eq.34) and R1=1KΩ (eq.35).
C
R
L
R
ESR ×
=
Z
Z
f
C
1
R
f
C
1
R
1
R
×
π
×
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
π
×
×
=



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