TPS65261-1: TPS65261 is not working

rekoe

Part Number: TPS65261-1

Hello,

My problem is that the TPS65261-1 is not starting up.

In the datasheet is specified that Vin is possible between 4.5V and 18V.

I use 4.8V. In the datasheet is specified that the LDO of V7V provides 6.3V .. but how is that possible with lower input voltage?

Measurements:

Vin = 4.825V

VDIV = 4.777V

V7V = 0V .. is it possible that I need a higher voltage von 6,3V? But in the datasheed is specified that VIN has to be in range of 4.5V and 18V.

Here the schematic of it:

The both Resistors R308 and R309 are removed

The Resistor R310 it`s still there

MOSFET Q108 is removed

0 Jason Wang (BSR-MV) over 5 years ago

Hi,

Remove R310(Resistor connect with V7V pin) and try again.

Will give you more feedback on Monday.

0 Zhao Ma over 5 years ago

Hi, Sir

EN1/2/3 has internal pull-up current, they will be pull high when floating them.

After one of EN1/2/3 is high, the internal V7V will work.

So you can keep R310, and just remove R312, then try again.

0 rekoe over 5 years ago in reply to Zhao Ma

Hi,

I have now removed the three EN Resistors R312, R313 and R314.

No it works correctly thank you.

Best Regards

Power management forum