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AN2870 데이터시트(PDF) 32 Page - STMicroelectronics

부품명 AN2870
상세설명  L6585DE combo IC
PDF  41 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2870 데이터시트(HTML) 32 Page - STMicroelectronics

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Designing with L6585DE
AN2870
32/41
A more accurate procedure can be followed considering that the reported curves can be
represented by the following equation (f in kHz and R in k
Ω):
Equation 40
In particular the constant, k, and the exponent, e, can be calculated for a given Cosc
(expressed in pF) as follows:
Equation 41
Equation 42
Firstly k and e should be found and then R can be calculated as follows:
Equation 43
()e
R
k
f
=
() 872
.
0
OSC
3
C
10
6
.
499
k
⋅
=
() 581
.
0
OSC
C
33
.
1
1
e
−
=
Figure 17.
(A) k parameter versus Cosc (pF)
Figure 17.
(B) e parameter versus Cosc (pF)
e
1
pre
run
pre
e
1
run
run
f
k
R
//
R
f
k
R
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
=
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
=



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