TPA3140D2: Quiescent supply current in shutdown mode for TPA3140D2,TPA3144D2

Hello Hasebe-san, Shawn will take a look at your question, but in the meantime do you know that we have newer, high-performing replacements for these parts (TPA3136/37) www.ti.com/.../TPA3136D2. They are inductor free and have ultra-low EMI? Thanks, Jeff

Hello Shawn-san,

Thank you for your reply.

I measured the current in the power supply line.

First of all, 12 V was supplied to the power supply and the ICC was measured. As a result, it was possible to measure 35 mA which is the same value as Typ. Data of specifications.

After that, when the SD button was pressed in the same manner, Icc (sd) = 381 μA was measured.

If the value of the data sheet is MTS Board, I do not think it matches the specifications of datasheet.

The datasheet has a description of using the TPA 3140 D 2 EVM which is available at ti.com.

They are nervous to the power consumption values in the design.

First of all, please tell me whether the correct measured value in EVM or our measured value is correct.

Also please tell me why the specifications at shutdown are MTSBoard.

Best Regards,

Y.Hasebe

Hello Jeff-san,

Thank you for your reply and information.
But my customer has already started design.
So,I will introduce these devices at the next opportunity.

Best Regards,
Y.Haesbe

Hi Hasebe-san,
As I explained above, the value in datasheet only includes the leakage current on the device, but not includes the current through the components on the EVM. So the number should be the same for both EVM and MTS board. We need to focus on the test method. I believe your result is for the total current of EVM. How much is PVCC on your EVM board? When you push down the botton SHUTDOWN, the current through R1 is 240uA if PVCC=24V. This part of the current should be excluded. The same is R11.
You could also measure the current on PVCC and AVCC pin during shuntdown. But this needs some re-work on the EVM.
In addition, is there any load on the output of the EVM? It should be open.
One thing need to be noted is that please make sure the instrumemnt for current measurement has high precision, because the current is very low in this case. What if you turn off the power supply, is the measured current 0uA? We need to make sure there is leakage in this measurement.
Best reagards,
Shawn Zheng

Hello Shawn-san,

Thank you for your quick reply.
How much is PVCC on your EVM board?
⇒It is 12V.
When you push down the botton SHUTDOWN, the current through R1 is 240uA if PVCC=24V.
⇒I will try to check with vcc = 24V.
In addition, is there any load on the output of the EVM?
⇒No load is applied.
What if you turn off the power supply, is the measured current 0uA?
⇒It is 0μA.

Best Regards,
Y. Hasebe

Hello Shawn-san,

I'm sorry for my late reply.

I tried to recheck about 24V and 12V.

So I understood that your advice is correct.

Then I calculated it taking into consideration the circuit consumed by other than IC,

and it was possible to derive a value close to the specifications of the data sheet.

I removed the current consumption of PVCC and GVDD respectively from all the expense currents at SD.
Actually using TPA 3140 D 2 and under the condition of 12 V power supply,
I (power supply) = 381 uA
Current flowing through R1 I(R1): 120 uA
Current flowing through R11 I(R11): 12 uA
Current flowing through GVDD - GND resistance (total 50 kΩ)I(GVDD): 100 uA

ICC (sd) = I (power supply) - I (R1) - I (R11) - I (GVDD) = 41 uA

Is that correct?

Best Regards,

Y.Hasebe

Hi Hasebe-san,
Thank you very much for the update. I think your understanding and measurement are correct basically. Maybe you can measure the power supply current with removing all of the components which could introduce extra current loss.
Best ragards,
Shawn Zheng