TPS62162：TPS62162老是运行于Power Save Mode这个模式

Question: TPS62162 always work on power save mode

Because when I use TPS62162 provide power to DSP, DSP always get into Low power mode. I test the output voltage of TPS62162 separately, the Vout is normal 3.3V, but the output of PG pin is doesn't show the PWM mode, it seems to work in power save mode. when I change the load of 3.3V output, it still work in power save mode, May I ask what causes this ?

Answer :

Hi,

Could you please provide the load size before and after your change, as well as your circuit parameters (inductor value, output capacitance value)?Please kindly provide the schematic diagram if it is possible, so that we can better help you analyze the issue.

It seems that the waveform you tested is SW pin, not PG pin, Could you please help to confirm it? When load current is less than 0.5 * Δ IL, our device is working on the power save mode.Δ IL can be calculated by the Equation 8 on datasheet. To better help the community readings these threads, can you communicate with us in English. Thank you very much ! 

您好，

您可以提供一下你改变前后的负载大小，以及你的电路参数（电感值，输出电容值）吗？ 如果可以麻烦提供一下原理图，这样我们可以更好的帮助您分析问题。

您的波形测的应该是SW脚的波形，而不是PG脚的波形，您可以确认一下吗？当负载电流小于0.5*ΔIL时我们的器件是工作在power save mode模式下的。ΔIL 可已通过数据手册中的Equation 8来计算。您可以用英语和我们交流吗，我们很难理解中文，谢谢。

Best regards,

Kevin

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TPS62147 – New 17Vin, 2A buck with forced-PWM option for low output ripple.
1% accuracy over temperature, 0.8V to 12Vout, pin-compatible to 4A (TPS62136), for industrial applications.

Hi，
Since I have not heard from you lately. If you have further questions, you can reply to it below. If not, I will turn off this item.
Best Regards,
Kevin