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L7986TA 데이터시트(PDF) 24 Page - STMicroelectronics

부품명 L7986TA
상세설명  3 A step-down switching regulator
PDF  43 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L7986TA 데이터시트(HTML) 24 Page - STMicroelectronics

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Application information
L7986TA
24/43
Doc ID 022098 Rev 3
6.4.2
Type II compensation network
If the equivalent series resistance (ESR) of the output capacitor introduces a zero with a
frequency lower than the desired bandwidth (that is: 2
π∗ESR∗COUT>1/BW), this zero helps
stabilize the loop. Electrolytic capacitors show non-negligible ESR (>30 m
Ω), so with this
kind of output capacitor the type II network combined with the zero of the ESR allows to
stabilize the loop.
In Figure 12 the type II network is shown.
Figure 12.
Type II compensation network
The singularities of the network are:
Equation 29
In Figure 13 the Bode diagram of the PWM and LC filter transfer function (GPW0 · GLC(f))
and the open-loop gain (GLOOP(f) = GPW0 · GLC(f) · GTYPEII(f)) are drawn.
f
Z1
1
2
π R
4
C
4
⋅⋅
------------------------------------
=
f
P0
0
=
f
P1
1
2
π R
4
C
4
C
5
⋅
C
4
C
5
+
----------------------
⋅⋅
---------------------------------------------------
=
,,



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