L5987 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'L5987' PDF : 40 Pages View PDF
L5987
6.4.2
Application information
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: 2ESR COUT > 1 / BW), this zero
helps stabilize the loop. Electrolytic capacitors show not negligible ESR (> 30 m), so with
this kind of the output capacitor, the type II network combined with the zero of the ESR
allows stabilizing the loop.
In Figure 14 the type II network is shown.
Figure 14. Type II compensation network
The singularities of the network are:
Equation 26
fZ1 = -2-----------R--1---4-------C----4-
fP0 = 0
fP1 = 2------------R-----4----1---C--C-------4--4------+--------C--C--------5--5--
DocID14972 Rev 4
25/40
40
Share Link: 
