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L5987 Datasheet(PDF) 24 Page - STMicroelectronics

Part # L5987
Description  3 A step-down switching regulator
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5987 Datasheet(HTML) 24 Page - STMicroelectronics

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Application information
L5987 - L5987A
24/42
Equation 25
The suggested maximum system bandwidth is equals to the switching frequency divided by
3.5 (FSW/3.5), anyway lower than 100 kHz if the FSW is set higher than 500 kHz.
For example with VOUT = 3.3 V, VIN = 12 V, IO = 3 A, L = 10 μH, COUT = 22 μF, ESR < 1 mΩ,
the type III compensation network is:
In Figure 12 is shown the module and phase of the open loop gain. The bandwidth is about
71 kHz and the phase margin is 46°.
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
220
Ω
=
R
4
3.3k
Ω
=
C
3
3.3nF
=
C
4
10nF
=
C
5
180pF
=
,,
,
,
,
,



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