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TPL5111: Using this nano-timer with n-channel transistor to power electromagnet.

Mike Sully
Prodigy 10 points
Part Number: TPL5111
Other Parts Discussed in Thread: TPL5110,

Hello,

I have a 3V circuit already using TPL5110 and a p-channel FET that powers an electromagnet (has a 100 ohm resistance) for 1 hr when Pin 5 of TPL5110 (that is connected to GATE of the FET) goes LOW for a 1 hr time interval (used 124kOhm resistor for that time intereval). The circuit and nano-timer work great. 

However, now I would like to create a circuit that works the same, but uses TPL5111 and an n-channel FET (Pin 5 of timer still connected to GATE), but with the electromagnet now only receiving power when Pin 5 goes HIGH. I have received mixed reviews that TPL5111 is not ideal for this use. Do you agree or do you think TPL5111 can be used in this situation? Any input you have would be greatly appreciated so I can hopefully incorporate this chip in my products.

Thank you,

Mike

  • 0
    TI__Prodigy 165 points

    Hello Mike,

    TPL5110 output is DRV, where as TPL5111 output is nDRV (inverted output). Other than inverted outputs they are identical parts.

    Assuming gate switching parameters for both N-channel & P-channel FETS are identical, technically both the devices should result in same functionality.

    Regards,

    Siva.