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LM5160A: On the EN terminal of inverting buck-boost.

watanabe
Expert 1740 points
Part Number: LM5160A
Other Parts Discussed in Thread: LM5160

Hi,

For the following conditions,
I am planning to use the attached circuit diagram.

I have a question.
I am trying to set the rising voltage of UVLO of EN to 7.4V.

Will it rise with Vin = 7.4 V with the following circuit?
Or should you Float the EN when using the inverting boost circuit?

Conditions:

Vin=9~14V

Vout=-30V

Iout=140mA

Fsw=857kHz

SoftStart=4ms

Schimatic:

Best Regards,

Watanabe

  • 0
    TI__Mastermind 40040 points

    Hello,

    If you want the turn on to be 7.4V you should set the resistor divider ratio as you have it in the schematic and I recommend this approach.  

    The EN will have 1.24V across it at turn on (with Vout at 0V).  Then, as the device turns on and the output regulates to -30V you will have 6.5V on the EN pin referenced to -Ve out when the input voltage is at 9V (ref to Gnd).  

    The LM5160 EN pin can have up to  70V from its EN to AGnd pin, so there are no issues with the device in this particular application.  

    hope this helps?

    Kind regards,

    David.