參數(shù)資料
型號(hào): PM6681ATR
廠商: STMICROELECTRONICS
元件分類(lèi): 穩(wěn)壓器
英文描述: 0.4 A DUAL SWITCHING CONTROLLER, QCC32
封裝: 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, ROHS COMPLIANT, VFQFPN-32
文件頁(yè)數(shù): 32/47頁(yè)
文件大小: 2762K
代理商: PM6681ATR
Design guidelines
PM6681A
38/47
Equation 36
Example:
OUT1 = 1.5 V, fSW = 290 kHz, L = 2.5 H, Cout = 330 F with Rout 12 m. We design
RESR = 12 m. We choose CINT = 1 nF by equations 31, 34 and Cfilt = 47 pF, RINT = 1 k by
eq.28, 29. C = 5.6 nF by Eq.35. Then R = 36 k
(eq.36) and R1 = 3 k (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
and C = 4.7 F.
VCC filter. A VCC low pass filter helps to reject switching commutations noise:
Figure 42.
Inductor current waveforms
Z
f
C
1
R
f
C
1
R
1
R
×
π
×
×
π
×
=
V
VC
C C
C
R
C
L
LD
D O
O5
5
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