TPS40140: TPS40140 pulse loss in the first phase

Lenna Yan

Intellectual 1960 points

Part Number: TPS40140

Hi team,

I have another questions about the TPS40140. The input voltage is 10V and output voltage is 3.3V. During the test, the customer will find the first phase loses two pulses. Do you know why the controller will loss pulse?

over 3 years ago

0 Qian Chen over 3 years ago

TI__Mastermind 24075 points

Hi Lenna,

What's green signal in waveform?

Does it happen during steady state, load transient or other condition?

Thanks

Qian

0 Lenna Yan over 3 years ago in reply to Qian Chen

TI__Intellectual 1960 points

Hi Qian,

The circuit is operating in steady state.

0 Qian Chen over 3 years ago in reply to Lenna Yan

TI__Mastermind 24075 points

Hi Lenna,

Can you check if COMP signal has a dip when two pulses are missing?

Also, can you measure bode plot to check if loop is stable?

Thanks

Qian

0 Qian Chen over 3 years ago in reply to Qian Chen

TI__Mastermind 24075 points

This post is supported offline.

Thanks

Qian

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TPS40140: TPS40140 pulse loss in the first phase