LM3478: LM3478 ripple on light load

Kai Hsiao

Guru 12675 points

Part Number: LM3478

Dear Sir

I meet 500mV ripple output voltage on light load

When output current is 130mA ,LM3478 can be config to CCM

May I know how could I use small output current (iout=50mA) to config LM3478 to CCM

0 EricLee over 8 years ago

Hello

By using a bigger inductance inductor, your converter will operate in CCM at lower output current.

Thanks.

0 Kai Hsiao over 8 years ago in reply to EricLee

Guru 12675 points

Dear Eric

Thanks for your reply
Do you have excel calculator??
I can't use webench to optimize the schematic

Thanks

0 EricLee over 8 years ago in reply to Kai Hsiao

Hello
Sorry I don't have. Simulation might be able to provide you more information. You can download the model at www.ti.com/.../snvmaw8
Thanks

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