Datasheet

DocID022801 Rev 5 23/42
A7986A Application information
Figure 12. Open loop gain Bode diagram with ceramic output capacitor
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: 2π∗ESR∗COUT>1/BW), this zero helps
stabilize the loop. Electrolytic capacitors show not negligible ESR (>30 mΩ), so with this
kind of output capacitor the Type II network combined with the zero of the ESR allows the
stabilization of the loop.
In Figure 13, the Type II network is shown.