TPL5110: DRV out to be maintained active

TISL

Expert 4105 points

Part Number: TPL5110

Dear e2e support,

If my understanding of our TPL5110 is correct, the DRV output remains active during a maximum of "Tip-50ms".

Is there a solution to maintain this output always active?

My need is to add a delay between an external event and a relay we have to drive:

external event --> delay set between 0 and 2s --> drive a relay until we decide de reset the function.

Do you see any trick to do this with our TPL5xxx or any other solution?

Regards,

over 4 years ago

0 Lane Boyd over 4 years ago

TI__Genius 16845 points

Another customer recently posted a similar query on the forum. What do you think of this approach?:

https://e2e.ti.com/support/clock-and-timing/f/48/t/921169

Kind regards,
Lane

0 TISL over 4 years ago in reply to Lane Boyd

TI__Expert 4105 points

Hi Lane,

Correct. That's the kind of application.

Could you explain how a RC on the DRV can latch this output?

DRV is a push-pull, right?

Regards,

0 Lane Boyd over 4 years ago in reply to TISL

TI__Genius 16845 points

Yes, DRV is push-pull. The RC will not impact the signal at the DRV pin, but at the RC output you may see that the 50ms pulse is mostly filtered out.

One thing to note is that the time interval of TPL5110 can only be set at power up, it cannot be changed dynamically. Do you need to change the time interval each time?

Perhaps you can use the TPL5110 in one shot mode . Request the DRV output using M_DRV as shown in Figure 12 (use the external event to control M_DRV)

Kind regards,
Lane

Clock & timing

Clock & timing forum

TPL5110: DRV out to be maintained active