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L7980ATR Datasheet(PDF) 26 Page - STMicroelectronics

Part # L7980ATR
Description  2 A step-down switching regulator
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7980ATR Datasheet(HTML) 26 Page - STMicroelectronics

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Application informations
L7980
26/44
Doc ID 15181 Rev 4
Equation 28
For example with VOUT=5 V, VIN=24 V, IO=2 A, L=27 μH, COUT=330 μF, ESR=50 mΩ, the
type II compensation network is:
In Figure 15 is shown the module and phase of the open loop gain. The bandwidth is about
24 kHz and the phase margin is 48°.
C
5
C
4
2
π R
4
C
4
4BW
⋅
1
–
⋅⋅⋅
--------------------------------------------------------------
=
R
1
1.1k
Ω
=
R
2
150
Ω
=
R
4
6.8k
Ω
=
C
4
82nF
=
C
5
82pF
=
,,
,
,



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