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L7986TA датащи(PDF) 22 Page - STMicroelectronics

номер детали L7986TA
подробное описание детали  3 A step-down switching regulator
PDF  43 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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L7986TA датащи(HTML) 22 Page - STMicroelectronics

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Application information
L7986TA
22/43
Doc ID 022098 Rev 3
Equation 25
4.
Calculate C5 by placing the second pole at four times the system bandwidth (BW):
Equation 26
5.
Set also the first pole at four times the system bandwidth and also the second zero at
the output filter double pole:
Equation 27
The suggested maximum system bandwidth is equal to the switching frequency divided by
3.5 (FSW/3.5), anyway, lower than 100 kHz if the FSW is set higher than 500 kHz.
For example, with VOUT=5 V, VIN=24 V, IO=3 A, L=18 μH, COUT=22 μF, and ESR<1 mΩ, the
type III compensation network is:
Equation 28
In Figure 11 the module and phase of the open-loop gain is shown. The bandwidth is about
58 kHz and the phase margin is 50 °.
C
4
1
π R
4
f
LC
⋅⋅
----------------------------------
=
C
5
C
4
2
π R
4
C
4
4BW
⋅
1
–
⋅⋅⋅
-------------------------------------------------------------------------
=
R
3
R
1
4BW
⋅
f
LC
--------------------
1
–
------------------------------
=
C
3
1
2
π R
3
4BW
⋅⋅
⋅
-------------------------------------------------
=
,
R
1
4.99k
Ω
=
R
2
680
Ω
=
R
3
200
Ω
=
R
4
2k
Ω
=
C
3
3.3 nF
=
C
4
22nF
=
C
5
220pF
=
,,
,
,
,
,



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