I'm looking for suggestions for electrolytics that are 10mm diameter and up to 25mm tall, through-hole radial capacitors with 5mm lead spacing. The value needs to be in the range of 330uF to 470uF. I typically use 35v caps due to their lower ESR vs 16v caps. Currently, the Panasonic FC is being used but the FM series is under consideration.
This is for the primary side of a switching power supply in a car audio amplifier.
Is there a way to calculate power dissipation in a capacitor to predict which will operate at a lower temperature? For example, a 470uF may have a lower ESR but will have greater current due to higher capacitance than a comparable 330uF. Would a 470uF with an ESR of 0.02 ohms operate at a lower temperature than a 330uF with an ESR of 0.025 ohms? Let's assume that the ripple will be about the same and largely determined by much larger amplifiers operating from the same 12v supply.
This is for the primary side of a switching power supply in a car audio amplifier.
Is there a way to calculate power dissipation in a capacitor to predict which will operate at a lower temperature? For example, a 470uF may have a lower ESR but will have greater current due to higher capacitance than a comparable 330uF. Would a 470uF with an ESR of 0.02 ohms operate at a lower temperature than a 330uF with an ESR of 0.025 ohms? Let's assume that the ripple will be about the same and largely determined by much larger amplifiers operating from the same 12v supply.
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