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LM61460EVM: LM61460 Passives

Part Number: LM61460EVM
Other Parts Discussed in Thread: LM61460

Hi there,

My team and I are building a board which utilizes the LM61460. We are using the EVM as a guide.
I have some questions with regards to the LM61460 EVM:
Please take into consideration that I am trying to maximize efficiency here and will happily add additional components to assist with this.
What is RINJ used for? If I am not planning on doing accurate voltage sensing on the output, do I need this?
Can enable be tied directly to the 28V input? Is it better to tie with a 100k res?
How do I connect an LED to PGOOD? The language is a bit confusing? Should I just connect an LED to the output instead?
Daniel
  • Hello Daniel,

    Good to hear from you again.

    Rinj is used to hook up secondary of bode plotter injection transformer across. It is not needed for device operation, rather, is provided in aiding in loop analysis testing.

    EN can withstand the voltage that of VIN up to is ABSMAX as specified in the datasheet.

    For highest efficiency (at high loads) the biggest hook would be reducing the loss associated with the DCR of the output inductor and switching loss. This can be achieved by selecting an inductor with low DCR and designing the converter for low switching frequency, ie: 400kHz. 

    For high efficiency at low loads, selecting an output FB divider with RFBT = 1M can aid in reducing input current.

    PGOOD is open drain output. With device out of regulation, fault can be signified with LED by having LED with current limiting and appropriate biasing configuration.