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Beep Capacitor in driver A3941

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  • Beep Capacitor in driver A3941

    Hello All,

    I have been listening to an annoying beep on the circuit board that I mount and now I decided to look from where it came from as it spread all over the circuit board and it was difficult to know if it came from the coils or other capacitors, what it was.

    This is the capacitor that goes on pins 7 and 8 (Vreg) of the driver A3941, this ceramic capacitor of 22uF / 25V (digi-key 445-9112-1-ND) emits a beep. This capacitor I do not know how to calculate it.
    Also as recommended Allegro is close to the driver's pins.

    The maximum voltage according to the datasheet is 13.75V in Vreg when measuring I get 13.5V.

    I would like to know the reason for that sound beep or if I have to switch to another capacitor,

    Thank you.
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    Last edited by jackadam; May 31st, 2017, 03:53 PM.

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