Maximum value of Output Capacitor of TOPswitch 271

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Hi

Is there the maximum limit of output capacitor value in the design if the output capacitor's value recommended in PI expert software is not used? How to calculate it?

thanks,
Regards,

Hi,

PI expert tool chooses output capacitance from database based on output rms ripple current . In general most of the applications demands 1% ripple voltage. The maximum value of capacitance is limited by soft-start timer. Top switch has 17ms soft-start timer meets most applications startup requirements for a rated power.

Can Heavy load with capacitor 4700uF or 6900uF cause TOP266 damage or just start-up problem?

Hi Hzhu,

There is no damage to top-switch with capactive load, since it has a peak-peak current limit.