UCD9224 Controller + UCD74120 Driver fails regulation

Victor Vargas

Other Parts Discussed in Thread: UCD74120, UCD9224

Hi E2E,

I'm using the UCD9224 Controller in combination with the UCD74120 Driver.

The problem I'm facing is that the voltage is being regulated for a short time (5 seconds best case, immediately turns off worst case) as the following image shows

The conditions when its regulating are the following ones (It starts regulating with faults already present):

When it stops regulating, the following conditions arises

The configurations are the following ones

Source.zip

The problem is with the 1.8V, 1.2V runs OK. For the moment, dependencies on 1.8V are off.

Any guess ? The PS provides enough current

Thanks !

over 8 years ago

0 Zhiyuan Hu over 8 years ago

TI__Genius 9845 points

The operation stopped due to FLT input is asserted. The FLT is sent from UCD74120. Please check if UCD74120 has one of the following conditions: high-side over current, low-side over current, over temperature, VGG UVLO, or noise on FLT.

Thanks,

Zhiyuan

0 Victor Vargas over 8 years ago in reply to Zhiyuan Hu

Prodigy 95 points

Thanks, yes I already make it worked by the Faults.

Where can I manually turn on and off the outputs using the GUI ?

Thanks !

0 Zhiyuan Hu over 8 years ago in reply to Victor Vargas

TI__Genius 9845 points

FLT is from UCD74120, triggered by fault conditions. It cannot be turned off.

Regards,

Zhiyuan

0 Victor Vargas over 8 years ago in reply to Zhiyuan Hu

Prodigy 95 points

Yes, Thats correct Mr, Zhiyuan.

My question was more oriented that, if you dont have any fault, is theres an option where, I can turn off and on by software, the outputs ?

Thanks

0 Zhiyuan Hu over 8 years ago in reply to Victor Vargas

TI__Genius 9845 points

Please go to Configure->On_Off_Config. If choose Control PIn Only, you can toggle CONTROL pin to turn on/off the rail. If choose OPERATION Only, you can send OPERATION PMBus command to turn on/off the rail. Both CONTROL and OPERATION can be controlled by Fusion GUI in Monitor page.

Regards,

Zhiyuan

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UCD9224 Controller + UCD74120 Driver fails regulation