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L5986 数据表(PDF) 23 Page - STMicroelectronics

部件名 L5986
功能描述  2.5 A step-down switching regulator
PDF  39 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L5986 数据表(HTML) 23 Page - STMicroelectronics

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L5986 - L5986A
Application information
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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 not negligible ESR (> 30 m
Ω), so with this
kind of output capacitor the type II network combined with the zero of the ESR allows
stabilizing the loop.
In Figure 12 the type II network is shown.
Figure 12.
Type II compensation network
The singularities of the network are:
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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