TPS2660: TPS26601 Issue about SHDN/

Jake Jung

Expert 1915 points

Part Number: TPS2660

Hi.

I have a question about SHDN/ working.

1. Load is about 800mA

2. First Start up is OK

3. SHDN/ pin is set LOW, VOUT is OFF. This working is OK.

4. But SHDN/ pin is set HIGH, VOUT is sitll OFF and FLT is activated.

5. And then if SHDN/ pin is set LOW -> HIGH after 8~10 seconds, VOUT is ON.

Why this working is occurred?

Please let me know how to fix this.

Thanks.

0 Karikalan Selvaraj over 7 years ago

Hi Jung,

Could you share waveform of VIN , VOUT, SHDN and FLTb. This will help to identify why the faulty behaviour is seen.

Regards,
Kari.

0 Jake Jung over 7 years ago in reply to Karikalan Selvaraj

Expert 1915 points

Hi Kari

I attached waveform and test result. Please refer below PPT file.

Problem is when SHDN/ is HIGH within about 5 seconds after SHDN/ LOW, VOUT is not turn ON.

Why this issue is occurred and let me know debugging point.

0 Jake Jung over 7 years ago in reply to Karikalan Selvaraj

Expert 1915 points

Hi.

I attached waveform and waiting.
Please let me know that.

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