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LM5119Q: 24V to 12V converter design

Part Number: LM5119Q
Other Parts Discussed in Thread: LM5170-Q1, LM5119, LM5170

Hi Team, 

This is customer request, I would be very happy if you can support. Thanks in advance

We will make 24V -> 12V converter.
I had questions about the LM5119Q and LM5170-Q1.
 
To meet the power requirement of 12V loads, our converter output voltage will be 13.5V. Our output current versions will be 20A, 30A, 40A, 60A, 80A, 100A.
 
LM5119Q
The output current is specified as max 15A. Is it 15A for each channel or 15A is the sum of two channels?
Output 60A appears in ref design at www.ti.com/.../PMP10260 link.
Can I get 100A by increasing the Mosfet parallell number?
 
 
LM5170-Q1
I'm thinking of using it in buck mode.
The output current is specified as max 50A. Is it 50A for each channel or 50A is the sum of two channels?
In which input voltage ranges can the 50A output output when I use it as a buck?
Circuit breaker is used in bi-directional ref design, do I need circuit breaker when I use in Buck mode?

  • Hi Furkan,

    The output current capability is more decided by the FET, not LM5119. 

    It is doable to support 20-25A current per phase. 

    For 100A application, it's better to use 4phase design with 2xLM5119. 

    I'm not supporting LM5170. Can you submit a new post for LM5170 question?

    Thanks

    Qian