TPS51285B: power on time requirement

FRANK1

Part Number: TPS51285B
Other Parts Discussed in Thread: TPS51285A

Hi sir,

The input is 12V, EN1 / EN2 is controlled by LDO3 in my design,

I see that there are some time requirements not specified in the time sequence in the datasheet of Figure 4. TPS51285A Timing Diagram of Start-up.

www.ti.com/.../tps51285b.pdf

I want to know the exact power on time requirement.

How much time can't be greater than?

Thanks.

over 4 years ago

0 Lishuang Zhao over 4 years ago

TI__Expert 7500 points

Hi,

I can't understand which exact time do you want to know?

Figure4 in DS, VIN, EN1 and EN2 are input pins which rising time depends on input signal. VREG3 and VREG5 ramp up time depends on caps bypass this pin. Others, tss, tss(ramp) and tpgdly can all be find on electrical characteristics table.

So can you clarify your question? Or why you care about the timing and what is the application?

Thanks,

Lishuang

0 FRANK1 over 4 years ago in reply to Lishuang Zhao

TI__Expert 8555 points

Hi Lishuang,

Thank you,

I will confirm it.

0 Lishuang Zhao over 4 years ago in reply to FRANK1

TI__Expert 7500 points

Okay.

Feel free to let me know.

Lishuang

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TPS51285B: power on time requirement