MP2459 during load step

DC-DC Power Converters
1

MP2459, vin=24v, vout=5v, cin=4.7uF, L=15uH, Cout=22uF, R divider = 124kohm, 23.7kohm.

During a load step from 0mA to 500mA, Vout drops 200mV. The duty cycle does not increase during this time. The load step slewreate is 0.5A/us and takes 50us to recover.

Shouldn’t the dutycycle increase during the load step, or it is too fast?

2

Hi Magnus,

Can you show me the load transient waveforms? I want to see the load current, SW node voltage and the output voltage. Thanks!

Best,

Fox

3

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