LM5155-Q1: question about Isupply in 《How to Design a Boost Converter Using LM5155 (ti.com)》

Jay wang

Intellectual 2491 points

Part Number: LM5155-Q1

hi experts

when i read this APP note:How to Design a Boost Converter Using LM5155 (ti.com)

i cannot find how to calculate Isupply.

i know Isupply means input supply current of the boost converter. BUT how to get 2.985A

over 1 year ago

0 Niklas Schwarz over 1 year ago

TI__Mastermind 26070 points

Hi Jay,

Thanks for using the e2e forum.

The output power or output current and voltage need to be defined by the application requirements.
In an ideal system (efficiency = 100%), Pout = Pin. This way the input current can be calculated.

Best regards,
Niklas

0 Jay wang over 1 year ago in reply to Niklas Schwarz

TI__Intellectual 2491 points

ok got it. if i use efficiency = 100%,Vout=24V,Iout=2A,Isupply=2.985A, then Vsupply is 16.08V

if use efficiency = 90%, Isupply is close to 2.985A

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LM5155-Q1: question about Isupply in 《How to Design a Boost Converter Using LM5155 (ti.com)》