TPS2490: TIMER pin

Kuramochi Tadahiko

Guru 28715 points

Part Number: TPS2490

Hi,

My customer is evaluating TPS2490.

Charging and discharging are repeated on the TIMER pin when the current limit, nevertheless TPS2490 is latch-off type.

Is this correct behavior?

Best Regards,

Kuramochi

over 4 years ago

0 Rakesh over 4 years ago

TI__Guru** 105361 points

Hi Kuramochi,

No, the Timer voltage should be at 0V for latch-off type.

Can you share the schematic and test waveform of Vin, EN, input current, Timer voltage during overload condition.

Best Regards,

Rakesh

0 Kuramochi Tadahiko over 4 years ago in reply to Rakesh

Guru 28715 points

Rakesh-san,

Thank you for your support.

I have additional information.

My customer says that charging and discharging were repeated since the external SW FET breaks.

Have you ever heard of such a phenomenon?

And, it means that this is an abnormal condition.

They concern about the TPS2490 switch into an auto-retry mode in normal operating conditions.

Is there any possibility like that?

Best Regards,

Kuramochi

0 Rakesh over 4 years ago in reply to Kuramochi Tadahiko

TI__Guru** 105361 points

Hi Kuramochi-san,

No. That phenomenon is not expected.

Best Regards,

Rakesh

0 Kuramochi Tadahiko over 4 years ago in reply to Rakesh

Guru 28715 points

Hi Rakesh-san,

Thank you for your reply.

Though being different from designated, I attach the waveforms.

VOUT and IOUT are not shut off because FET is broken.

I request the customer designated waveforms.

Best Regards,

Kuramochi

0 Rakesh over 4 years ago in reply to Kuramochi Tadahiko

TI__Guru** 105361 points

Hi Kuramochi-san,

You mean FET has damaged. Can you share schematic and filled up design calculator for review. The design calculator is available under product folder.

Best Regards,

Rakesh

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TPS2490: TIMER pin