UC3846: How to configure Automatic Symmetry

Ryker She

Part Number: UC3846

Tool/software:

Hi expert,

My customer (Uni-trend) is evaluating UC3846 and they want to use Automatic Symmetry Correction in Push-Pull Configuration but don't know how to configure, could you provide some guideline about it? Thanks.

Best Regards,

Ryker

4 months ago

0 Hong Huang 4 months ago

TI__Guru 74115 points

Hi,

What is Automatic Symmetry Correction and where do you see this? Please provide details on this.

0 Ryker She 4 months ago in reply to Hong Huang

TI__Expert 4880 points

Hi Hong,

We saw Automatic Symmetry Correction in datasheet as below, we can't refer full datasheet and could you also provide the full datasheet to us? Besides, below is the customer (Uni-trend) schematic, please help to check how to configure the Automatic Symmetry Correction function?

UC3846.pdf

Best Regards,

Ryker

0 Hong Huang 4 months ago in reply to Ryker She

TI__Guru 74115 points

Hi,

The datasheet can be found here

UCx846/7 Current Mode PWM Controller datasheet (Rev. C)

It looks Automatic Symmetry Correction is achieved in push-pull converter with peak current mode control where to eliminate / limit the flux walking by peak current control. So you need to use peak current mode control in push-pull converter to achieve this feature without other setup.

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UC3846: How to configure Automatic Symmetry