TPS61170: About Device Operation After Applying Static Electricity

Yuta Nishie

Part Number: TPS61170

Hi,

The customer tested the application with a static electricity test. When static electricity was applied to the LCD attached to the application instead of the TPS61170, the waveform was similar to Fig. 1 in the attached document.
Could you comment on the following questions?

1. After supplying static electricity, Vin decreased and Vout=Vin (Fig. 2). I think this behavior is due to UVLO, is that correct?

2. In Figure 3, when Vout=Vin, CTRL=Low was entered, and then Vout became the desired voltage (24 V). Could you tell me why Vout=24 V even though CTRL= Low?

TPS61170 waveform.pdf

Best Regards,

Nishie

10 months ago

0 Mulin Yuan 10 months ago

TI__Expert 3330 points

Hi Nishie,

Would you please provide further details to help judge the phenomenon:

1.Please provide the schematic that contains the LCD and TPS61170. I'd like to check the impact to TPS61170 when static electricity was applied to the LCD. Please also point out the test point.

2.Keep CTRL low, reset and set VIN, will VOUT follow VIN to shut down and restart?

3.Can you replicate the phenomenon? Whether it occurs every time after applying static electricity?

4.Can you provide the SW and inductor current waveforms?

Regards,

Mulin

0 Yuta Nishie 10 months ago in reply to Mulin Yuan

Genius 3230 points

Hi Mulin-san,

Thank you for your support.

I ask the customer about the your question. Also, if a schematic is available from the customer, it cannot be posted to E2E due to non-disclosure information. Could you tell me your email address?

Best Regards,

Nishie

0 Mulin Yuan 10 months ago in reply to Yuta Nishie

TI__Expert 3330 points

Hi Nishie,

My email address is mulin-yuan@ti.com.

Regards,

Mulin

0 Yuta Nishie 10 months ago in reply to Mulin Yuan

Genius 3230 points

Hi Mulin-san,

Thank you.

As soon as I get the circuit diagram from the customer, I will send it to you.

Best Regards,

Nishie

0 Mulin Yuan 10 months ago in reply to Yuta Nishie

TI__Expert 3330 points

Hi Nishie,

Ok, I will wait for your reply.

Regards,

Mulin

0 Yuta Nishie 10 months ago in reply to Mulin Yuan

Genius 3230 points

Hi Mulin-san,

I sent you an e-mail with the subject "[E2E] TPS61170: About Device Operation After Applying Static Electricity".

I would appreciate it if you could reply by e-mail.

Best Regards,

Nishie

+1 Mulin Yuan 10 months ago in reply to Yuta Nishie

TI__Expert 3330 points

Hi Nishie,

I will check the email and reply by e-mail later. Please feel free to contact me by e-mail.

Regards,

Mulin

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TPS61170: About Device Operation After Applying Static Electricity