AN1518

Application ideas

27/30

Figure 27.

Synchronization example

10.5

Compensation network with MLCC (multiple layer ceramic

capacitor) at the output

MLCCs with values in the range of 10 µF-22 µF and rated voltages in the range of 10 V-25 V

are available today at relatively low cost from many manufacturers.

These capacitors have very low ESR values (a few m

Ω) and thus are occasionally used for

the output filter in order to reduce the voltage ripple and the overall size of the application.

However, a very low ESR value affects the compensation of the loop (see Section 5) and in

order to keep the system stable, a more complicated compensation network may be

required. The figure below shows an example of a compensation network stabilizing the

system with ceramic capacitors at the output (the optimum component value depends on

the application).

Figure 28.

MLCC compensation network example