TPS2393A Waveform disturbance

T Kishi

Genius 4425 points

Other Parts Discussed in Thread: TPS2393A

Abnormal waveform is I was able to confirm in TPS2393A of EVM.

VIN ：45.5V

UVLO：45V

LOAD ：78Ω(About 600mA)

COUT ：386uF(100uF+68uF×2＋150uF)

FAULTTIME：27nF

IRAMP　　：2200pF

When the input voltage is turned ON by at about UVLO,

It confirmed the abnormal waveform.

Please tell me , Is this normal operation?

Best Regard

T Kishi

TPS2393AEVM_Waveform disturbance.pdf

over 10 years ago

0 Darwin Fernandez over 10 years ago

TI__Mastermind 41790 points

Hi Kishi,
The input voltage is close to UVLO. There is inrush current and voltage drop from the power supply cables during startup. Is the voltage going below UVLO when you enable the EVM? You probably need to increase the input voltage and use shorter cables when you enable.

0 T Kishi over 10 years ago in reply to Darwin Fernandez

Genius 4425 points

Hi Darwin

Thank you for reply.

I was understanding be due to UVLO.

I have one new question.

If pattern design is bad (for example, a bad pattern of -48V) and,

wonder this error there is likely to be liable to occur?

Please tell me.

Regard

T Kishi

Power management

Power management forum

TPS2393A Waveform disturbance