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L7980 Datasheet(PDF) 21 Page - STMicroelectronics

No. de pieza L7980
Descripción Electrónicos  2 A step-down switching regulator
PDF  44 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7980 Datasheet(HTML) 21 Page - STMicroelectronics

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L7980
Application informations
Doc ID 15181 Rev 4
21/44
Equation 20
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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