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LM5122: Is LM5122 a good choice?

Bo Zeng Peng
Prodigy 130 points
Part Number: LM5122

Hello,

In our application, we want to use LM5122 to drive a 500W power amplifier for short pulse (e.g. 10 ms). The power input to our system would be around 50 W. So our idea now is to put a big capacitor at the output. 

When the power amplifier is working, we expect the LM5122 to go to hiccup mode. And the capacitor would discharge to provide the required power. 

When the power amplifer is in idle mode, we hope LM5122 can recover from the hiccup mode to charge the capacitor. 

We would like to ask if LM5122 a good choice for this application.

Can LM5122 recover from hiccup mode? In my simulation with TI-NA spice as is shown in another thread ( ) , I am not able to get LM512 recovered from Hiccup mode. 

Best regards,

Bo

  • 0
    TI__Mastermind 21720 points

    Hi Bo Zeng Peng,

    Thanks for reaching out with your question and for considering the LM5122 in your design.

    Hiccup peak current limiting can be disabled by pulling the RES pin to ground. This would allow the LM5122 to continue to deliver some power to the amplifier when it is on. This could also help reduce the require capacitance needed on the output.

    The LM5122 would be a good choice for this application.

    Please let me know if you have any questions.

    Thanks

    Garrett