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TS12A12511: TS12A12511DCNR

Siegfried Wurzer
Prodigy 30 points
Part Number: TS12A12511

Hi,

I want to use the TS12A12511DCNR in our PCB;
Supply Voltage of the switch is 12V; the control signal for the switch (pin 6 "IN") is generated by an uC and is 4.5V.
According the specificartion of the TS12A12511DCNR the "on" level for the "IN" signal is minimum 5V. Are really 5V necessary to switch the TS12A12511DCNR to "on" @ 12V V  or does it also work with 4.5V for the control signal? (I don't have 5V in the circuit).

Do sombody know the input circuit of TS12A12511DCNR pin 6 "IN - signal"?

Thanks in advance
Siegfried

  • 0
    Prodigy 70 points

    Hi Siegfried,

    if you want an industrial design follow or undergo the spec! IMHO the simplest solution is a opendrain driver consisting of

    a 2N7002 driven by the uC with pullup resistor 100k..1Meg to Vcc at pin6. Result is inverted signal with 12Vcmos-level.

    In others case it can work direct (datasheet figure 6): +Vcc/GND->Vth (3Vcc->1.1V; 5Vcc->1.6V; 6Vcc->1.8V; extrapolation 12->~2.4V),

    but dont ask for behaviour at temperature, tolerance etc. .The IC is a CMOS, the threshold have tolerance (look at threshold for 2N7002).

    Regards

    Miko

  • 0 in reply to Miko92
    TI__Mastermind 45380 points
    Siegfried,

    You may find out when you test the device that the device will work with 12V supply and 4.5V. However, TI can only recommend operating the device based off the stated spec.

    Miko92 recommendation of creating a level shifter on the control logic pin is also a valid option.

    Thank you,
    Adam