LM61460-Q1: inrush current from input cap

HI

The current into input IC is decide by the input slew rate, and the current to IC decide by the output cap and load. you need care about the input overshoot when you applied the Vin very quickly, the inductor of the input will resonant with the input cap make the VIN PIN votlage higher than input voltage. the current will be controlled the IC, its max current will be its current limit.

Thanks

Hi Daniel,

So do we have input inrush current spec which generated by applying Vin quickly?

Roy

Hi 

We don't have limitation for Vin dv/dt slew rate for device but pls make sure the voltage at VIN PIN is no larger than max voltage rating. 

Thanks

Hi Daniel,

So we only need to concern the voltage spike apply to Vin, is it right?

The inrush current2 showing below doesn't need to care, is it right?

Regards,

Roy

Roy

Yes, the chip not care the inrush current. only the votlage spike on the input PIN.

the inrush 2 current is due to the quick dv/dt applied on the input line, it will cause large current to charge the Cin, Irush2=Cin*dv/dt ,so the inrush current go into Cin.

Thanks