UCC28019 and UCC28019A

John2012

Intellectual 585 points

Other Parts Discussed in Thread: UCC28019A, UCC28019

Hello,

What are the differences between UCC28019 and UCC28019A?

After half hour reading the datasheest, I couldn't tell, thought to ask a quick question as I'd like to buy it today.

anybody can help?

Thank you,

over 12 years ago

0 Lisa Dinwoodie over 12 years ago

TI__Genius 15910 points

Here's a summary of the changes that were made to the UCC28019 that became the UCC28019A

UCC28019 vs. UCC28019A.ppt

0 John2012 over 12 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

Hi Lisa,

Thank you very much for your help.

may I ask one more question:

for the auxiliary supply of the IC, is there any specific requirement? such as start up delay or so?

currently I am using an IC from other company and now I am going to replace it with 28019A, I wonder if the same auxiliary power supply could be used, which is from the a few turns out of the PFC inductor.

Thank you,

0 John2012 over 12 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

also, is there an application note for this chip?I didn't find it.

thanks a lot,

0 Lisa Dinwoodie over 12 years ago in reply to John2012

TI__Genius 15910 points

The only requirement for the bias supply is that it is a well regulated 12V source. Using a winding off of the PFC inductor is not recommended as you would need a very large capacitor in order to prevent the voltage on VCC from falling below the VCCoff threshold. The voltage ripple on VCC must be less than 0.8V in order to stay within the UVLO hysteresis. This is noted on page 12 of the data sheet.

There isn't an application note for this device but there is a Design Calculator spreadsheet that is hidden in the Software section of the product folder (http://www.ti.com/litv/zip/sluc117e) and this will calculate all of the values required for a successful design.

0 John2012 over 12 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

Hi Lisa,

much appreciated, it helps a lot indeed.

0 John2012 over 12 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

HI Lisa,

I got a question here, can you please help get an answer?

http://e2e.ti.com/support/power_management/digital_power/f/184/t/267005.aspx

thanks a lot,

0 Lisa Dinwoodie over 12 years ago in reply to John2012

TI__Genius 15910 points

I'm sorry but I am not fluent in the digital-esque language that question is posted in. Someone from that product line has to address that particular question.

0 John2012 over 12 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

Hi Lisa,

thanks a lot.

how can I get it answered? is there a moderator or so that can help reach that team?

Thank you,

0 Lisa Dinwoodie over 12 years ago in reply to John2012

TI__Genius 15910 points

because the question is posted in the digital forum it should be addressed by the appropriate team as it is.

0 John2012 over 12 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

Hi Lisa,

You help me a lot, just one more question

my posts were moved to C2000 forum, but have not been answered after a week.

how can I find a moderator that can help find the team being able to answer my questions?I got stuck here and hope SB can clarify it.

Thank you very much,

0 Lisa Dinwoodie over 12 years ago in reply to John2012

TI__Genius 15910 points

I am not subscribed to any of the microprocessor forums (or any besides AC/DC isolated power). I don't know of anyone specific that supports those products.

0 John2012 over 11 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

figure out, my mistake, thanks

thanks a lot,

0 John2012 over 11 years ago in reply to Lisa Dinwoodie

Intellectual 585 points

Hi Lisa,

Does 28019A work with 400Hz input?

thanks a lot,

0 Lisa Dinwoodie over 11 years ago in reply to John2012

TI__Genius 15910 points

Technically it would work with a 400 Hz input BUT you may have to settle for compromised performance. This is because the 400 Hz line cycle is 5 - 6 times less than the typical 50 - 60 Hz input so there will be fewer switching cycles to achieve good power factor. A 60 Hz input will have approximately 540 pulses every rectified half line cycle available for wave-shaping whereas a 400 Hz line will only have 81 switching cycles available to work with.

The Design Calculator lets you input the line frequency ad uses this value in the calculations for the recommended components.

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UCC28019 and UCC28019A