• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 64 subscribers
  • Views 291 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM76005: Schematic review and BIAS pin connection

SAERO
Intellectual 326 points
Part Number: LM76005

Hello,

I'm looking for schematic review for below schematic. Also looking for suggestion for BIAS pin connection when Vout is 5.3V, 5A. All the capacitors used are ceramic and do I need more caps at input or output? 

Thank you!

  • 0
    TI__Expert 6960 points

    Hello,

    Since output is greater than 3.3V connect BIAS to Vout to boost efficiency at light loads. Your input and output caps look good. Please doublecheck the value of your feedforward capacitor (C8) using section 8.2.2.7 in the datasheet, it might be too small. 

    Regards,

    Rahil

  • 0 in reply to Rahil Ajani
    Intellectual 326 points

    Hello Rahil,

    Can you check this?

    I made few changes like, removed Pin 7 and 23 connection as per datasheet. Connected BIAS to Vout with 2.2uF bypass cap. Cff according to my calculations comes up to 7.5pF. Any ways to verify this?

    Thank you!

  • 0 in reply to SAERO
    TI__Expert 6960 points

    You would use the following formula to find Cff

    where

    Using Vout = 5.3V, Cout = 188.57uF, Rfbb = 23.2kOhm, Rfbt = 100kOhm:

    Cff = 237pF

    Please double check my math here.

    Regards,

    Rahil