UCC28742: Not getting required Output.

Aakash Darji

Part Number: UCC28742

Tool/software:

I have been using UCC28742 IC for power switching, also using XZM-E30091 transformer for stepping up voltage. However, still I am not getting desire output in circuit like a 1000V.

over 1 year ago

0 Hong Huang over 1 year ago

TI__Guru 74115 points

Hi,

There are two reference designs. They can do 1000V input and with good results using the same family device, or similar family device. You can compare your designs to these to find where to improve.

TIDA-01505 reference design | TI.com

https://www.ti.com/lit/pdf/sluucn1

0 Aakash Darji over 1 year ago in reply to Hong Huang

Prodigy 20 points

The mentioned reference design is not meeting with our requirements as we required 1000V output when input voltage 110-120 is applied.

You shared the reference design for stepdown voltage, so it will not work.

Kindly share the reference design for stepping up output voltage.

0 Hong Huang over 1 year ago in reply to Aakash Darji

TI__Guru 74115 points

Hi,

We do not have a step up design. The operation mechanism is quite the same in a flyback. If you cannot get the 1000V, you need to test your design to see if your transformer turns ratios are correct, and the switching are correct, etc. to find where the issues are.

I suggest you to use the excel design sheet to check your design as well.

0 Aakash Darji over 1 year ago in reply to Hong Huang

Prodigy 20 points

We have taken the reference of mentioned design report which is generated from WENBENCH TI. Moreover, we have set the parameters of transformer and other components suggested in design report. However, we still not getting the desire output.
Therefore, kindly suggest that in which section we need to work for resolving the problem.
85to265VInput_1000VFlybackConverterDesign.pdf

0 Hong Huang over 1 year ago in reply to Aakash Darji

TI__Guru 74115 points

Hi,

Webench is just a starting point - you need to debug your converter to find where the issue is not able to reach 1000V. You need to capture the waveforms to see how the transformer works like to decide if your transformer and your converter work like your design and then tune up accordingly. You need to measure the waveform of each portion of your converter to find where need to tune up, such as Vds, transformer secondary-side waveform, CS pin, OUT pin, etc. to help your debugging.

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UCC28742: Not getting required Output.