Hey all,
What type of capacitor is best suited for input filtering. MLCC or Polymer capacitors ? This is for a buck converter ADP1850. Design specs are as follows
Vin: 12V
Vout: 8.1V
iOut(max): 83A
Freq: 220kHz
Duty Cycle: .675
Peak I: 10A
RMS I: 3.16A
L: 1.2uH
Capacitor peak RMS I: 11.7A
Cin, Min: 103uf
This will be used to charge a 3S2P, 8.1V 260F bank of capacitors. On page18 they talk about both ripple current and voltage
I am confused if i should go with the Polymer because of the high ripple current but would prefer the MLCC (two in parallel for this application) because of their low ESR. What does insulation resistance of 100 MΩ·μF mean for these capacitors ?
What type of capacitor is best suited for input filtering. MLCC or Polymer capacitors ? This is for a buck converter ADP1850. Design specs are as follows
Vin: 12V
Vout: 8.1V
iOut(max): 83A
Freq: 220kHz
Duty Cycle: .675
Peak I: 10A
RMS I: 3.16A
L: 1.2uH
Capacitor peak RMS I: 11.7A
Cin, Min: 103uf
This will be used to charge a 3S2P, 8.1V 260F bank of capacitors. On page18 they talk about both ripple current and voltage
and shows formula for both MLCC and Ploymer. For the applicaiton, calculated ripple current is about 11.7A. This MLCC is rated 16V and for my application Vout is 8.1V. As per the datasheet temp vs ripple current rating is shown in the range of 0-5A. Does it that mean that is the max rating ?The input capacitor needs sufficient ripple current rating to handle the input ripple, as well as an ESR that is low enough to mitigate input voltage ripple.
I am confused if i should go with the Polymer because of the high ripple current but would prefer the MLCC (two in parallel for this application) because of their low ESR. What does insulation resistance of 100 MΩ·μF mean for these capacitors ?