TPS54260: TPS54260 RT/CLK

T Kishi

Part Number: TPS54260

My customer has question.

Customers are referring to this circuit.

http://www.tij.co.jp/jp/lit/an/slva540/slva540.pdf

Customer checking the RT / CLK pin waveform,At point B, it operates with an offset of about 1V.
The RT / CLK low threshold is not met. How can customer improve this?

TPS54260_RTCLK.pdf

Best Regard

T Kishi

over 5 years ago

0 Ankit Gupta95 over 5 years ago

TI__Expert 4555 points

Hi Kishi.

Do waveform looks fine at point B, when part is not powered up? Can you please share the screenshot. Thanks!

Best Regards,

Ankit Gupta

Application Engineer

0 T Kishi over 5 years ago in reply to Ankit Gupta95

Genius 4425 points

Hi Ankit

The customer got the waveform.

The waveform is appears that an offset of about 300mV is applied when no power is applied.
Is this a problem on the clock signal side?

Rgeard

T Kishi

0 Ankit Gupta95 over 5 years ago in reply to T Kishi

TI__Expert 4555 points

Hi Kishi,

Something is not looking correct here.

Can you please ask customer to have Sync signal and waveform at point B in one scopeshot, when part is not powered up.

Best Regards,

Ankit Gupta

0 T Kishi over 5 years ago in reply to Ankit Gupta95

Genius 4425 points

Hi　Ankit

The customer got the waveform.
Is the waveform different from normal operation?

Regard

T Kishi

0 T Kishi over 5 years ago in reply to Ankit Gupta95

Genius 4425 points

Hi Ankit

Are there any subsequent updates?

The customer is asking for a comment, so please comment.

Regard

T Kishi

0 Zhao Ma over 5 years ago in reply to T Kishi

TI__Genius 15135 points

Hi, Kishi

Suggest to change C12 to 100pF or change R22 to 1kohm, then test again.

Power management

Power management forum

TPS54260: TPS54260 RT/CLK