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LM5160A: about open short test

Kaji@PAN
Mastermind 7775 points
Part Number: LM5160A

Hi,

I am doing open short test of LM 5160A now.
VOUT increased when the RON pin was in the open state.
Please tell me about the following about this.

 When the RON pin is in the open state, VOUT will be high, but is this behavior correct?

 Is there a way for VOUT not to rise?

Best Regards,

  • 0
    TI__Genius 13700 points
    Hello,

    The purpose of Ron is to set the ON-Time for the Constant On Time control loop.

    Ron is a pin that should never be left floating and as a result there is no characteriszed operation for the LM5160A when RON which is a required external component is not present.

    What you are possibly encountering is the result of Equation (3) & (4) in the datasheet for the LM5160A. When RON is not present the switching frequency changes and as a result of this relationship entering a not recommended and undefined state with the RON value effectively being infinite the switching frequency will deviate from the recommended operating range and the Vout will most likely move around as well.

    Is this important because sometimes the RON pads fail to be populated with a resistor are because this resistor might be damaged or removed by accident?