LM3150: High switching transients

eric wilson

Part Number: LM3150
Other Parts Discussed in Thread: LM61440

My circuit functions as expected --> 6V to 30V in, 5.2V out at 15 watts. However, the switching transients are about 1 volt peak to peak. Any suggestions. I used the Webench schematic and BOM.

over 4 years ago

0 Timothy Hegarty over 4 years ago

TI__Guru 73952 points

Hi Eric,

Please send the schematic and a completed quickstart calculator file https://www.ti.com/tool/LM315XQUICK-CALC

You may need to increase the output capacitance depending on the load step and its di/dt. Note that we also have converters (with integrated FETs) for this input voltage range and output current, e.g. LM61440.

Regards,

Tim

0 Timothy Hegarty over 4 years ago in reply to Timothy Hegarty

TI__Guru 73952 points

Just to confirm, when you mention " switching transients", are you referring to steady state output ripple or load transient response? A 5.2V/3A output generally needs at least one 47uF/10V/X7R capacitor.

Regards,

Tim

0 Timothy Hegarty over 4 years ago in reply to Timothy Hegarty

TI__Guru 73952 points

Hi Eric,

If there aren't any further questions, I will close out this thread.

Regards,

Tim

Power management

Power management forum

LM3150: High switching transients