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PM6681ATR датащи(PDF) 38 Page - STMicroelectronics

номер детали PM6681ATR
подробное описание детали  Dual synchronous step-down controller with adjustable LDO
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6681ATR датащи(HTML) 38 Page - STMicroelectronics

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Design guidelines
PM6681A
38/47
Equation 36
Example:
OUT1 = 1.5 V, fSW = 290 kHz, L = 2.5 µH, Cout = 330 µF with Rout ≈ 12 mΩ. We design
RESR = 12 mΩ. We choose CINT = 1 nF by equations 31, 34 and Cfilt = 47 pF, RINT = 1 kΩ by
eq.28, 29. C = 5.6 nF by Eq.35. Then R = 36 k
Ω (eq.36) and R1 = 3 kΩ (eq.37).
9.7
Other parts design
●
VIN filter. A VIN pin low pass filter is suggested to reduce switching noise. The low pass
filter is shown in the next figure:
Figure 41.
VIN pin filter
Typical components values are: R = 3.9
Ω and C = 4.7 µF.
●
VCC filter. A VCC low pass filter helps to reject switching commutations noise:
Figure 42.
Inductor current waveforms
Z
Z
f
C
1
R
f
C
1
R
1
R
×
π
×
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
π
×
×
=
 
V
VC
C C
C
R
R
C
C
L
LD
D O
O5
5



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