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L7986 Datasheet(PDF) 22 Page - STMicroelectronics

Part # L7986
Description  3 A step-down switching regulator
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7986 Datasheet(HTML) 22 Page - STMicroelectronics

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Application information
L7986
22/43
DocID022450 Rev 6
Equation 27
The suggested maximum system bandwidth is equal 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 = 5 V, VIN = 24 V, IO = 3 A, L = 18 H, COUT = 22 F, ESR < 1 m,
the type III compensation network is:
In Figure 12 the module and phase of the open-loop gain is shown. The bandwidth is about
58 kHz and the phase margin is 50°.
R3
R1
4BW
fLC
----------------- 1
–
---------------------------
=
C3
1
2
 R
3 4BW
 
-----------------------------------------
=
R1 4.99k
=
R2 680
=
R3 200
=
R4 2k
=
C3 3.3nF
=
C4 22nF
=
C5 220pF
=




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