TPS610985 Power consumption is abnormal

Joyce Hu

Prodigy 40 points

Other Parts Discussed in Thread: TLV3491, TPS610985

Hi,

I use TPS610985 and TLV3491 in my project,found that the power consumption is abnormal.Here is the schematic.

(1)The total power of DC/DC is about 5-8uA when R135 is 300Ω. When adjust R135 to 1M, the power consumption is 1.4uA.

(2)If i use software to shutdown the TLV3491,the total power of systerm decrease 2.3uA.

In datasheet of TPS610985 ,it says the consumption is 300nA.Is there any points should I pay attention?The power consumption seems abnormal.Any suggestion?

over 7 years ago

0 Peter Meaney over 7 years ago

TI__Mastermind 31580 points

Hi

The TPS610985 is a non isolated dc/dc device, I will move your post to the correct forum and ask one of the applications engineers to respond to your post.

Regards

Peter

0 Jasper Li over 7 years ago

TI__Mastermind 46905 points

300nA is the quiescent current current, not the input current as your measurement. refer to this AN from calculating and measuring the input current at light load condition "www.ti.com.cn/.../slva828.pdf"

for the question 1, the R135 should not impact the input current. but i'm afraid the 1M could the device operates abnormal. could you keep the R135 at 300R, and measure the input current again when disconnecting the load of the TPS610985

Power management

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TPS610985 Power consumption is abnormal