Window Comparator- LTC1042 for 12V window detection

I have implemented a comparator and LED indication circuit to detect 12V supply with-in range of +/- 300mV.

As in the valid window considered is 11.7V (lower limit) and 12.3V (upper limit). With this understanding I have implemented an separate LED individually on pin# 6 (ABOVE) and another on pin#1 (WITHIN).

The LED on pin#1 will glow when the detected voltage falls in Valid Window  (11.7V to 12.3V) and when the voltage is ABOVE12.3V the LED on pin#6 will glow. As a supply to this IC, on pin#8, 12V continuously supply from DC adapter is provided and on pin#3, the input is from power supply board, that generates 12V, is provided.

The problem is the LEDs on both the pin is not glow and indicating the proper margins. I simulated the circuit on LT spice, with the same values of resistors on IC pins and verified the high/ low levels (12V_EX in this case) on pin#1 and pin#6 when Vin was applied such that, 11.7 <= Vin <=12.3

But when I am measuring and testing on actual PCB, this circuit is not giving correct results. 

Please review it and let me know if I have missed out any implementation in it.

Thanks,

Dhara

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  • Hi Analog Device Team,

    Please help to resolve this issue.. We need to finalize this design and move on to freeze and procure the components..

    We are still not able to get the high (Vcc) on Within(pin#1) and Above(pin#6) pins if the supply is in range or above the window defined by Center (pin#2) and Width/2 (pin#5).

    Let us know if there is any thing missing in the design implementation shared in the image (previous post) as soon as possible.

    Regards,

    Dhara

Reply
  • Hi Analog Device Team,

    Please help to resolve this issue.. We need to finalize this design and move on to freeze and procure the components..

    We are still not able to get the high (Vcc) on Within(pin#1) and Above(pin#6) pins if the supply is in range or above the window defined by Center (pin#2) and Width/2 (pin#5).

    Let us know if there is any thing missing in the design implementation shared in the image (previous post) as soon as possible.

    Regards,

    Dhara

Children
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