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L7985 Fiches technique(PDF) 25 Page - STMicroelectronics

No de pièce L7985
Description  Voltage feed-forward
PDF  42 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7985 Fiches technique(HTML) 25 Page - STMicroelectronics

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DocID022446 Rev 7
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L7985
Application information
42
Equation 32
For example with VOUT = 5 V, VIN = 24 V, IO = 2 A, L = 22 H, COUT = 330 F, ESR = 70 m
the type II compensation network is:
In Figure 15 the module and phase of the open-loop gain is shown. The bandwidth is about
36 kHz and the phase margin is 53 °.
Figure 15. Open-loop gain Bode diagram with electrolytic/tantalum output capacitor
C5
C4
2
 R
4 C4 4BW
1
–

--------------------------------------------------------------
=
R1 1.1k
=
R2 150
=
R4 4.99k
=
C4 180nF
=
C5 180pF
=




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