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LM74722-Q1: switching frequency of the boost regulator

Gerhard Krimmel
Prodigy 20 points
Part Number: LM74722-Q1


I'm currently checking if the component could be used in my application.

However I do have little concerns regarding conducted / radiated emssions caused by the boost regulater implemented in the component..

Unfortunately the datasheet does not provide information about the switching frequency of that boost regulator.

Can this information be provided?

Thanks.

  • 0
    TI__Guru 57737 points

    Hi Gerhard,

    For the Integrated boost converter,

    • VS pin is the input 
    • LX is the switch node
    • CAP is the output
    • The low side switch and high side diode are integrated 

    The boost converter output voltage VCAP is used by the gate drivers of GATE and PD signals. The boost switching frequency is around 500kHz. You can see the boost switch node signal captured below. 

    To achieve good EMI performance, please  follow '11.1 Layout Guidelines' specified in the datasheet especially for the boost components within the red box below. Also, provide enough decoupling capacitor on the VS pin to GND as specified in the datasheet.