TPL5110-Q1: TPL5110-Q1 Frequent reset

user6354551

Part Number: TPL5110-Q1
Other Parts Discussed in Thread: TPL5110, TPL5110EVM

Dear

Our company refers to "TPL5110EVM User's Guide" and TPL5110 manual application circuit design One shot mode circuit is as follows:

The test found the following two problems:

1. Due to the existence of C8 capacitor, IC is frequently reset.The yellow is DRV and the blue is +3V3. How to avoid this problem?

2. Power supply + BAT on. After one shot mode, IC is easy to reset and restart when power supply + BAT fluctuates, as shown in the following figure.How does this reset happen?POR?Why does a voltage fluctuation within the supply voltage range still cause a reset?

over 2 years ago

0 Noel Fung over 2 years ago

TI__Guru* 81400 points

Hi There,

Would you please try again with R20 and R21 = 0Ω?

0 user6354551 over 2 years ago in reply to Noel Fung

Prodigy 180 points

R20 and R21=0R have been tried, test problem 1 still exists.Please be informed that ~

0 Noel Fung over 2 years ago in reply to user6354551

TI__Guru* 81400 points

Hi There,

in your second picture, if the yellow trace represents +bat, the voltage drop is actually very big, almost 1/4 to 1/3 of its max.

If you use a stable power supply to replace +bat, do you see any issue?

0 user6354551 over 2 years ago in reply to Noel Fung

Prodigy 180 points

Question 2. Voltage fluctuations within the supply voltage range can still cause reset?After voltage fluctuation, it is still within the IC power supply range of 1.8~5.5V.The phenomenon of problem 2 does not exist if there is no voltage fluctuation.

0 Noel Fung over 2 years ago in reply to user6354551

TI__Guru* 81400 points

Hi There,

Right, so the problem came from the battery voltage. As shown in your picture, there are three power glitches. The time base is 500ms/div. The voltage drop was happen gradually in 200ms to 300ms. This voltage drop did not trigger a "reset". However, the battery voltage will resume back to 3V in a very short period of time. I believe it is this rising edge that trigger a reset to the device. The first two power glitches did not trigger a reset probably because the voltage drop are not low enough.

To resolve this problem, maybe you can try put a 10µF or 100µF capacitor at pin 1 of U3.

0 user6354551 over 2 years ago in reply to Noel Fung

Prodigy 180 points

As you said, the three power glitches trigger a reset probably because the voltage drop are low enough. when voltage drop happened, the voltage value is still higher than 2V. Shown in the datasheet, Supply voltage range: 1.8V to 5.5V. This moment IC should still work normally. why the problem happens?

0 Noel Fung over 2 years ago in reply to user6354551

TI__Guru* 81400 points

Hi There,

I think the voltage drop alone will not trigger a reset, the reset is likely triggered by the fast voltage return back to 3V.

Clock & timing

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TPL5110-Q1: TPL5110-Q1 Frequent reset