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L5980 Fiches technique(PDF) 19 Page - STMicroelectronics

No de pièce L5980
Description  0.7 A step-down switching regulator
PDF  37 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5980 Fiches technique(HTML) 19 Page - STMicroelectronics

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Application information
L5980
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Equation 17
Figure 10.
Type III compensation network
In Figure 11 the Bode diagram of the PWM and LC filter transfer function (GPW0 · GLC(f))
and the open loop gain (GLOOP(f) = GPW0 · GLC(f) · GTYPEIII(f)) are drawn.
Figure 11.
Open loop gain: module bode diagram
The guidelines for positioning the poles and the zeroes and for calculating the component
values can be summarized as follow:
1.
Choose a value for R1, usually between 1 kΩ and 5 kΩ.
2.
Choose a gain (R4/R1) in order to have the required bandwidth (BW), that means:
f
P0
0
=
f
P1
1
2
π R
3
C
3
⋅⋅
------------------------------
=
f
P2
1
2
π R
4
C
4
C
5
⋅
C
4
C
5
+
--------------------
⋅⋅
--------------------------------------------
=
,,



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