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L5981 Datenblatt(PDF) 21 Page - STMicroelectronics

Teilenummer L5981
Bauteilbeschribung  1A step-down switching regulator
PDF  37 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5981 Datenblatt(HTML) 21 Page - STMicroelectronics

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Application informations
L5981
21/37
Equation 21
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW/3.5), anyway lower than 100kHz if the FSW is set higher than 500kHz.
For example with VOUT=3.3V, VIN=12V, IO=1A, L=33µH, COUT=22µF, the type III
compensation network is:
In Figure 12 is shown the module and phase of the open loop gain. The bandwidth is about
56kHz and the phase margin is 53°.
R
3
R
1
4BW
⋅
f
LC
-----------------
1
–
---------------------------
=
C
3
1
2
π R
3
4BW
⋅⋅ ⋅
-----------------------------------------
=
,
R
1
4.99k
Ω
=
R
2
1.1k
Ω
=
R
3
110
Ω
=
R
4
5.6k
Ω
=
C
3
4.7nF
=
C
4
10nF
=
C
5
100pF
=
,,
,
,
,
,



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