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PM6680 bảng dữ liệu(PDF) 40 Page - STMicroelectronics

tên linh kiện PM6680
Giải thích chi tiết về linh kiện  No Rsense dual step-down controller with adjustable voltages for notebook system power
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
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PM6680 bảng dữ liệu(HTML) 40 Page - STMicroelectronics

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Device description
PM6680
40/49
R must be chosen in order to have enough ripple voltage on integrator input:
Equation 34
R1 can be selected as follows:
Equation 35
Example:
OUT1 = 1.5V, fSW = 290KHz, L = 2.5uH, Cout = 330uF with Rout ≈ 12mΩ.
We design RESR = 12mW. We choose CINT = 1nF by equations 30, 33 and Cfilt = 47pF,
RINT = 1KΩ by eq.27, 28. C = 5.6nF by Eq.34. Then R = 36KΩ (eq.35) and R1 = 3KΩ
(eq.36).
7.13.7
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 38.
VIN pin filter
Typical components values are: R = 3.9
Ω and C = 4.7uF.
●
VCC filter
A VCC low pass filter helps to reject switching commutations noise:
C
R
L
R
ESR ×
=
Z
Z
f
C
1
R
f
C
1
R
1
R
×
π
×
−
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
π
×
×
=
V
VIIN
N
1
10
00
0p
pF
F
R
R
Input
voltage
C
C



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