TPS65580: output voltage vs input voltage

Ryuji

Guru 20090 points

Part Number: TPS65580

Hello,

In the datasheet figure 11, there is the Output voltage vs. Input Voltage graph.
The output voltage is varied in steps when the input voltage is between 7 and 9 V.
Could you please let me know this reason?

Best Regards,
Ryuji

over 7 years ago

0 Zhao Ma over 7 years ago

TI__Genius 15135 points

Hi, Ryuji

TPS65580 is Dcap2 architecture.
Actually, it is not the step of Vout(3.3V).
You can refer the EVM user's guide test waveforms, find it in below link.
www.ti.com/.../slvu952a.pdf

In DCAP2, the Vout and Vin voltage determine the ON time, when (Vin - Vout) larger, the ON timer will be more accuracy.
So it maybe caused by variation of ON timer.

0 Ryuji over 7 years ago in reply to Zhao Ma

Guru 20090 points

Hi Zhao san,

Thank you for the reply.
I understood.
In Figure 11, why does the decline of accuracy stop stopping around Vin = 7V?

Best Regards,
Ryuji

0 Zhao Ma over 7 years ago in reply to Ryuji

TI__Genius 15135 points

Hi, Ryuji san

it is hard to find the reason, maybe because the limitation of circuit design.

in new part, there is no step decline of line regulation.

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TPS65580: output voltage vs input voltage