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L5985 Scheda tecnica(PDF) 21 Page - STMicroelectronics

Il numero della parte L5985
Spiegazioni elettronici  2A step-down switching regulator
PDF  36 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5985 Scheda tecnica(HTML) 21 Page - STMicroelectronics

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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 = 2A, L = 15µH, 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
75kHz and the phase margin is 47°.
Figure 12.
Open loop gain Bode diagram with ceramic output capacitor
R
1
4.99k
Ω
=
R
2
1.1k
Ω
=
R
3
150
Ω
=
R
4
4.99k
Ω
=
C
3
3.3nF
=
C
4
10nF
=
C
5
100pF
=
,,
,
,
,
,



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