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Original question:

LM5170EVM-BIDIR: LM5170EVM-BIDIR: Using as a buck-boost

LM5170EVM-BIDIR: LM5170 Custom circuit

Kasun Rathnapala
Prodigy 230 points
Part Number: LM5170EVM-BIDIR
Other Parts Discussed in Thread: LM5170

Hi,

I m using LM5170 to build a battery charger. currently i m designing my own circuit. I m referencing the LM5170EVM-BIDIR schematic and I saw it uses two FETs for each functionality and 4 FETs for circuit breaker.

Is there any particular reason to do so? Or any design limitation? 

I require 60 amp of charging current in 14.5V. Any suggestions to lower the cost using few FETs?

Thanks.

  • 0
    TI__Guru 68655 points

    Hi Kasun,

    Thank you for designing with the LM5170.  The parallel FETs are used on the EVM to share the power, and also the power dissipation, such that each FET is not too hot.  For your battery charger, you may not need the circuit breaker FETs. If so, you can short them out.  Then, you can also save D3. 

    Also note that the switching FETs are 100V rated.  You may be able to use lower voltage FET according to your max input voltage.  If you use <40V FETs, a single FET may be adequate.  Please estimate the power dissipation by following the datasheet design equations.

    Thanks,

    Youhao Xi, Applications Engineering