LM5085: FET selection affect ripple injection value?

Shotaro Sakai

Expert 3420 points

Part Number: LM5085

Hello team,

Does Q1 selection affect the value of ripple voltage on Type-3 Ripple Circuit?

Best regards,

Shotaro

over 2 years ago

+1 Henry Kou over 2 years ago

TI__Expert 3766 points

Hi Shotaro,

Q1 selection affects your maximum ON time selection for FSW and RT, which affects your equation for choosing ripple voltage components. See section below where R3 and C1 are dependent on ON time:

Regards,

Henry

Power management

Power management forum

LM5085: FET selection affect ripple injection value?