UCC28056: UCC28056 efficiency curve

user5781628

Intellectual 970 points

Part Number: UCC28056

Hi,

I could see the efficiency curve in the UCC28056 file as below.

Could you tell me the auxiliary power loss is included when draw the efficiency curve?

Thanks very much!

Eleven Chen

over 7 years ago

0 Benjamin Lough over 7 years ago

TI__Mastermind 27135 points

Hi Eleven,

The auxiliary power loss was not included in the power loss curves.

Best Regards,

Ben Lough

0 user5781628 over 7 years ago in reply to Benjamin Lough

Intellectual 970 points

Hi Lough,

Thanks.

I use 12V voltage for UCC28056 VCC.

If let COMP pin to ground, what is the power loss for UCC28056?

If let VOSNS pin to ground, what is the power loss for UCC28056?

I want to turn off PFC stage and get the minimum power loss for UCC28056, how to achieve it?

Thanks!

Eleven Chen

0 Benjamin Lough over 7 years ago in reply to user5781628

TI__Mastermind 27135 points

Hi user5781628,

Grounding the COMP pin will put the controller in "Burst OFF" state. The max quiescent current while in this state is 132uA. For VCC=12V, this would equate to ~1.6mW.

I would advise against grounding the VOSNS pin, this would drive the output voltage up until hitting the OVP2 protection threshold.

Pulling COMP low will turn off the PFC and will give you minimal standby power loss.

Best Regards,
Ben Lough

Power management

Power management forum

UCC28056: UCC28056 efficiency curve