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L7986TA Datasheet(PDF) 26 Page - STMicroelectronics

Part # L7986TA
Description  3 A step-down switching regulator
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7986TA Datasheet(HTML) 26 Page - STMicroelectronics

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Application information
L7986TA
26/43
Doc ID 022098 Rev 3
4.
Then calculate C3 in order to place the second pole at four times the system bandwidth
(BW):
Equation 33
For example, with VOUT=5 V, VIN=24 V, IO=3 A, L=18 μH, COUT=330 μF, and ESR=35 mΩ,
the type II compensation network is:
Equation 34
In Figure 14 the module and phase of the open-loop gain is shown. The bandwidth is about
21 kHz and the phase margin is 45 °.
C
5
C
4
2
π R
4
C
4
4BW
⋅
1
–
⋅⋅⋅
-------------------------------------------------------------------------
=
R
1
1.1k
Ω
=
R
2
150
Ω
=
R
4
4.99k
Ω
=
C
4
82 nF
=
C
5
68pF
=
,,
,
,



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