What is the advantage of film capacitor?

[chihhao]

Film capacitor

What is the advantage of film capacitor??

Why people use it in charge pump circuit??

Thanks for your help.

 

[martinthorn]

Re: Film capacitor

Why people use it in charge pump circuit??

Good response to current transients (during rapid charge/discharge
cycles when PLL is locking). Compare PLL settling times if a
X7R capacitor is used in a loop filter : slower settling than with
film..

Capacitance vs. Temperature change is small like C0G.

Piezo-electric effect is low : lower spurious due to vibration than
when using a ceramic capacitor.

Downside is that the film-capacitors are not quite as robust as
ceramic ones : melt easily if touched with a soldering iron !