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L5980 Datasheet(PDF) 24 Page - STMicroelectronics

Part # L5980
Description  0.7 A step-down switching regulator
PDF  37 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5980 Datasheet(HTML) 24 Page - STMicroelectronics

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Application information
L5980
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Equation 25
For example with VOUT = 1.2 V, VIN = 12 V, IO = 0.7 A, L = 22 μH, COUT = 220 μF,
ESR = 50 m
Ω, the type II compensation network is:
In Figure 15 is shown the module and phase of the open loop gain. The bandwidth is about
35 kHz and the phase margin is 49°.
C
5
C
4
2
π R
4
C
4
4BW
⋅
1
–
⋅⋅⋅
--------------------------------------------------------------
=
R
1
1.1k
Ω
=
R
2
249
Ω
=
R
4
12k
Ω
=
C
4
47nF
=
C
5
68pF
=
,,
,
,



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