TPL5110: I am stuck at TPL5110 timer holding pulse .

Bishal Naya

Part Number: TPL5110

I am stuck at TPL5110 output voltage holding. It just gives me a small 0.5uS pulse on Output line. i need minimum 1 second pulse on output line to trigger my circuit. Can anybody help me out. T

5 months ago

0 Noel Fung 5 months ago

TI__Guru* 85670 points

Hi Bishal,

What resistor value did you put at pin 3?

0 Bishal Naya 5 months ago

Prodigy 10 points

I put 20k on pin 3

0 Noel Fung 5 months ago in reply to Bishal Naya

TI__Guru* 85670 points

Hi Bishal,

20kΩ will give you 50s interval, to get 1s interval, we should use 5.2kΩ.

BTW, did you provide the DONE signal to the timer?

0 Bishal Naya 5 months ago in reply to Noel Fung

Prodigy 10 points

DONE Pin is floating . Replace 20k with 5.2k but same issue. Is there any issue with the done pin if it is floating ?

0 Noel Fung 5 months ago in reply to Bishal Naya

TI__Guru* 85670 points

HI Bishal,

DONE signal is not available, that means you are using it as a timer only.

Even if we do not use the DONE pin, we should pull it LOW via a small resistor (say 1kΩ).

If there is no DONE signal, after POR and resistance reading, DRV will assert LOW. It will return to HIGH 50ms before t_IP is elapsed and then it will turn LOW again for the next time interval. As a result, you should get a series of 50ms pulse every t_IP period.

To put the device in timer mode, you need to tie the EN/ONE_SHOT pin to HIGH.