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TPS22810: Can TPS22810 drive inductive relay

Teach Me
Expert 1940 points
Part Number: TPS22810
Other Parts Discussed in Thread: TPS1H000-Q1, TPL7407LA

Hi TI Experts,

I plan to use TPS22810 as load switch to drive a relay for power supply sequences.

Can TPS22810 able to drive an inductive relay?

The load relay characteristic as below:

44 mH @ 100 Hz

Rshunt 37 Ohms @ 1 kHz

26 mH @ 1 kHz

Rsh 109 Ohms @ 1 kHz

 

DC current when energized 350 mA

 

In the mean time, i need to know whether flyback diode is needed or not, or I can use the quick discharge portion to de-energize the coil.

Thanks,

Br,

Teach Me

  • 0
    TI__Genius 15740 points

    Hi Teach Me,

    For driving inductive loads, we typically recommend our low side drivers (such as our TPL7407LA) or high side switches (such as our TPS1H000-Q1). Our low side switches have the flyback diode integrated and our high side switches have inductive load pulse specifications in the electrical characteristics.

    If you wanted to stick with the TPS22810, we cannot guarantee any energy dissipation across the body diode. A flyback diode would need to be added to protect the device from inductive transients. To test your specific configuration with this device, it would be worth ordering an EVM off of ti.com.

    Thanks,

    Alek Kaknevicius