參數(shù)資料
型號(hào)： PM6680TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.4 A DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁(yè)數(shù)： 35/49頁(yè)
文件大?。?/td> 2931K
代理商： PM6680TR
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 = 1.5 V, fSW = 290 kHz, L = 2.5 uH, Cout = 330 uF with Rout ≈ 12 m.
We design RESR = 12mW. We choose CINT = 1nF by equations 30, 33 and Cfilt = 47 pF,
RINT = 1 k by eq.27, 28. C = 5.6 nF by Eq.34. Then R = 36 k (eq.35) and R1 = 3 k
(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
and C = 4.7 uF.
●
VCC filter
A VCC low pass filter helps to reject switching commutations noise:
C
R
L
R
ESR ×
=
Z
f
C
1
R
f
C
1
R
1
R
×
π
×
×
π
×
=
V
VIIN
N
1
10
00
0p
pF
F
R
Input
voltage
C
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