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Original question:

TPS22810: Need help to chose Power Switch

TPS22810: TPS22810: How to wire a dual supply rail plus and minus 18V for soft-start with load switch?

Neil Henry
Intellectual 965 points
Part Number: TPS22810
Other Parts Discussed in Thread: TPA3251, TPS2121

Hello,

Trying to setup the TPS22810 as a inrush current limiter circuit for an analog audio front end application with the PREAMP OPA1662A-Q1 FRONT END. When the audio system turn on, can hear a loud pop-noise!

How to wire a dual supply rail plus and minus 18V for soft-start with load switch TPS22810?

SYSTEM DESIGN FLOW:

PreAMP-OPA1662 > TPA3251 > SPEAKER

The PreAMP-OPA1662 front end audio board sounds great!

However need to get rid of the pop noise, thank you. 

WIRING scenario:

+18V ->  TPS22810 {PreAMP-OPA1662 > TPA3251 > SPEAKER}

-18V ->   TPS22810 ????? [not sure how to apply this to the load switch] PLEASE ADVISE ON HOW TO APPLY ON TPS22810 AND OR TPS1H100. A PDIP alternative is welcome.

QUESTION:

1. How to wire a dual supply rail plus and minus 18V for soft-start with load switch TPS22810?

2. Can we use only one TPS22810 load switch for dual supply? If so is there a design reference for dual +-!8V supply?

3. Is there a PDIP load-switch that you all can recommend and cost effective that can solve the pop-noise?

4. Is there a TI reference design for discrete inrush current limiter as alternative?

We are looking all possible solution to solve the pop noise.

Regards

Neil Henry

IRAD

  • 0
    TI__Genius 10855 points

    Hi Neil, 

    Thanks for reaching out on E2E!

    So if my understanding is correct, you're connecting two TPS22810 in a power muxing configuration (2 input, 1 output). If so, unfortunately the TPS22810 cannot be used in this manner. Since the device does not have reverse current blocking, if the voltage on the output ends up slightly higher (ie IN1 starts decaying and then switches to IN2), then current will flow backwards through the body diode.

    I recommend looking at our app note, Power Multiplexing using Load Switches and eFuses. Not only do we provide a few configurations for MUXing, but we have some recommendations on how to configure manual/automatic switchover using an inverter or resistors. The TPS25942 could work for this application.

    Let me know if you have any questions.

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    Intellectual 965 points

    Hi Arthur,

    We have a discrete solution but looking for an integrated solution.

    Looking to explore a PDIP package for this scenario.

    Not sure what TI have that may do the trick!

    Thank you

    Neil

  • 0 in reply to Neil Henry
    TI__Genius 10855 points

    Hi Neil, 

    Unfortunately we don't have any DIP packages with reverse current blocking that can support this voltage range. Would a single integrated device, such as the TPS2121 work here instead?

    This device would replace both load switches and have all the logic integrated. It also comes with reverse current protection, overvoltage protection, current limit, and thermal shutdown.

    Thanks,

    Arthur