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MPY634: MPY634 Power supply pin limit current?

hoonmin Jang
Prodigy 60 points
Part Number: MPY634

Hello 

I am using MPY634 IC chip for mixer purpose. And we want to supply +15V and -15V as power. 
 I have 3 questions
1) How much current limit should I put on the power supply? 
2) And how much current is supplied to the power supply during normal operation? 
3) Lastly, when using the chip, what part should be paid attention to during the test so that the chip does not burn?

Thank you.

  • 0
    Guru 140200 points

    Hi Hoonmin,

    according to the datasheet the maximum supply current is 6mA. See page 3 of datasheet.

    The output short-circuit current is 30mA typical. See page 2 of datasheet.

    And the output short-circuit is allowed for an "indefinite period". See page 3 of datasheet. But, of course, to guarantee a long lifetime of chip the output short-circuit period should be limited and should not repeatedly and intentionally provoked during normal operation.

    To furtherly limit the heat dissipation during an output short-circuit, you could mount an "isolation" resistor at the output. This resistor will also help to isolate the output from capacitive loads eventually destabilizing the output.

    Kai

  • 0
    TI__Genius 9435 points

    Hi Hoonmin,

    hoonmin Jang said:
    how much current is supplied to the power supply during normal operation?

    As Kai pointed out form the datasheet, the maximum quiescent current is 6mA, however it is likely your device will be closer to 4mA as this is the typical value.

    hoonmin Jang said:
    How much current limit should I put on the power supply?

    This depends on how much current you plan to sink/source at the output of the MPY634 and if you want to limit the current to protect your device or other equipment in case of a fault condition. Kai mentioned that the output short-circuit current is 30mA, this is the current that can be sourced by the device when the output is connected directly to ground and can result in damage to the device if this is done for extended periods of time. I recommend calculating your load requirements and adjusting the current limit accordingly.

    hoonmin Jang said:
    Lastly, when using the chip, what part should be paid attention to during the test so that the chip does not burn?

    See page 3 of the datasheet for the Absolute Maximum Ratings. Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, for functional operation of the device see the electrical specifications section beginning at page 2 of the datasheet. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.

    Thanks,

    Zach