TPS7A25: Load Transient Details

Hirotsugu Kobayashi

Mastermind 8485 points

Part Number: TPS7A25

Hi team,

I have two questions.

Do you have a waveform with the horizontal axis of the load transient expanded?

Does the load transient depend on the ambient temperature?

Best Regards,

over 3 years ago

0 Jason Song over 3 years ago

TI__Mastermind 23361 points

Hi Kobayashi-san,

Yes, we do, please see Figures 28 and 29 in the datasheet for the load transients of TPS7A25. Yes, the overshoot value may change across different temps, at hot conditions, the overshoot could be increased.

Regards,

Jason Song

0 Hirotsugu Kobayashi over 3 years ago in reply to Jason Song

Mastermind 8485 points

Hi Jason,

I want to check how many seconds the voltage drop drops. In Fig.28, the horizontal axis is too large.

Do you have a Load Transient waveform on the order of ns?

Do you have actual Load Transient figure at low temperature (-30C) and high temperature (85C)?

Best Regards,

0 Hirotsugu Kobayashi over 3 years ago in reply to Hirotsugu Kobayashi

Mastermind 8485 points

Hi Jason,

If you don't have a graph on the order of ns, would you please get the Load Transient waveform under the following conditions?
Vin = 5V, Vout = 3.3V, Cout = 2.2uF, Iout = 1mA to 100mA

Best Regards,

0 Jason Song over 3 years ago in reply to Hirotsugu Kobayashi

TI__Mastermind 23361 points

Hi Kobayashi-san,

The load transients are only provided at room temp. The slew rate used in the datasheet plots is 0.5A/us, and the rising and falling time are around 600ns. The load transients result is highly determined by the board parasitic and the actual capacitor used with different degrading. For the condition that you are interested in, I would expect the load transient overshoot and undershoot to reduce to roughly 30% of the ones shown in the datasheet for 1mA - 300mA.

What's the tolerance for the overshoot and undershoot in the application?

Regards,
Jason Song

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TPS7A25: Load Transient Details