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L5985 Scheda tecnica(PDF) 19 Page - STMicroelectronics

Il numero della parte L5985
Spiegazioni elettronici  2A step-down switching regulator
PDF  36 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L5985 Scheda tecnica(HTML) 19 Page - STMicroelectronics

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L5985
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5.4.1
Type III compensation network
The methodology to stabilize the loop consists of placing two zeros to compensate the effect
of the LC double pole, so increasing phase margin; then to place one pole in the origin to
minimize the dc error on regulated output voltage; finally to place other poles far away the
zero dB frequency.
In Figure 10 the type III compensation network is shown. This network introduces two zeros
(fZ1, fZ2) and three poles (fP0, fP1, fP2). They expression are:
Equation 16
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.
f
Z1
1
2
π C
3
R
1
R
3
+
()
⋅⋅
------------------------------------------------
=
f
Z2
1
2
π R
4
C
4
⋅⋅
------------------------------
=
,
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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