TPS65150:Setting of VGH output

Hi Chanwoo,

Do you mean changing DLY2 has no effect to the delay time? What if you set DLY1 = DLY2?

BR

Patrick

When changing the cap of DLY2, the final output time of 18V changes normally.

The section where VGH is output at 9V seems to be a problem for the LCD. (red box part)

The output of VGH should start last. I will share the sequence of the LCD.

Hi Chanwoo,

So you mean the VGH start up delay can still be adjusted by DLY2 cap? Seems this is still the normal behavior of our IC.

BR

Patrick

Hi patrick,

The delay can be adjusted, but VGH output is 0V->9V->18V in steps.

VGH is held for about 30 ms at 9 V output and then output to 18 V.

I want to get rid of the section that is kept at 9V.

Please refer to the scope diagram.

Thanks for the answers.

Hi Chanwoo,

Our expert is currently out of office. He will reply to you later. Thanks for your understanding.

Best Regards,

Steven

Hi Chanwoo,

If you disconnect the LCD (Load of TPS65150), will the 30ms 9V still exist?

BR

Patrick

Hi Patrick,

yes, It is the same even if the LCD is removed.

BR,

Chanwoo

CTRL(13PIN) was connected to the existing VI, but I tried connecting it to GND.

The output of VGH was confirmed to be the same as before.

According to the datasheet, the output should be L.

Is there any need to replace the IC?

Best Regards,

chanwoo

Hi Chanwoo,

So how many ICs have you tested? If you tested only one, you could try another to see if similar issue still exists.

BR

Patrick