TUSB4041I: power problem

zhang ping

Part Number: TUSB4041I

Tusb4041ievm 3.3V and 1.1V power supply both use 1A power chip, but my actual application load power consumption is only tens of Ma. Through calculation, I use 300mA power chip to supply 3.3V power and the same chip to supply 1.1V power. However, the computer can identify hub but not USB device, but the test overall power consumption is about 200mA. Please help to analyze the power consumption problem?

over 4 years ago

0 Brian Zhou over 4 years ago

TI__Guru*** 144915 points

device may not in active mode, can you share schematic?

0 zhang ping over 4 years ago in reply to Brian Zhou

Genius 3835 points

During the debugging, we found that reset the tusb after power on will make the function of tusb normal. Do you have any suggestions on the circuit design? TUSB4041sch.pdf

0 Brian Zhou over 4 years ago in reply to zhang ping

TI__Guru*** 144915 points

as mentioned in another ticket, increase cap value >2uf to increase reset time, also remove the resistor

0 JMMN over 4 years ago in reply to Brian Zhou

TI__Guru 60870 points

Hi Zhang,

Did increasing the capacitor help?

Regards,

JMMN

0 zhang ping over 4 years ago in reply to JMMN

Genius 3835 points

no help

0 JMMN over 4 years ago in reply to zhang ping

TI__Guru 60870 points

Hi Zhang,

When the hub is connected to the host, what does the host report? Can you confirm that the downstream port power is enabled? Can you check that the power to the downstream devices is not drooping below 4.5V?

Regards,

JMMN

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TUSB4041I: power problem