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Original question:

REG71050: REG71050DDCT

REG71050: Enable pins timing and any limitations

Yanni Li
Intellectual 1960 points
Part Number: REG71050

We have a customer inquiring about the enable pins timing and any limitations for REG71050DDCT,here are the inquiry from the customer in verbatim:

I want to use REG71050DDCT to drive a 5V buzzer with 5V and ~30ma.I was thinking about using the enable pin as a on/off for the this.
Is there a limit to the on/off cycling of the enable pin, or a reason this wouldn't work correctly.

I am looking to add this to my design. I was going to use this IC to get 5V and then use a mosfet to source power from it to the buzzer, but why use another control line if the enable on this IC can do the same thing? I just want to know if there are unforseen reasons to not use this chip this way.

I might have to turn it of and on multiple times over a short period, thought it shouldn't be any quicker than 1 second or so.

There is not much information about the enable pins timing and any limitations it may have turning it off and on allot in a short period of time.

Thank you in advance.

  • 0
    TI__Guru 58215 points

    Hello Yanni,

    There is no timing limitation on the EN pin. In general, the device will need some time until it reacts on the EN pin and then until it has fully charged the output capacitor, see figure 20 in the datasheet.

    For turnoff, normally the load needs to discharge the output cap, so the turn off time is load dependent.

    So if your timing is too short, the output might not reach its final value or will not discharge, but not if you are turning on and off in the seconds range.

    Best regards,
    Brigitte