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HI
Currently, my client is planning to develop the specification of AC 220V Input / 2.5V, 450A Output.
I think the circuit should be composed of UCC28070-Q1 + UCC28951-Q1.
Is it possible to configure the circuit to satisfy the SPEC with this configuration?
Or do you have an IC that you can recommend separately?
HI Colin
Hello Andy
Yes, the PFC stage is not necessary. The UCC28951-Q1 will operate from a DC voltage generated at the output of an AC bridge rectifier. The Excel calculator for this device allows you to set the DC input voltage range and it will then run through the other calculations needed for your design. The duty cycle range (Dmin to Dmax) increases as the input voltage range increases, but 250Vdc to 375Vdc is achievable without difficulty.
Regards
Colin
HI Colin
Thank you very much for your quick reply.
I would like to ask you one more thing.
Can you get the excel file you mentioned ??
Hi Andy
It's on the product web page at http://www.ti.com/product/UCC28950/toolssoftware
Scroll down the page to 'Software 2' and select the Excel or Mathcad design tools.
Be careful with the transformer turns ratio - which is displayed rounded to nearest integer. Use copy and paste to bring the unrounded value from cell C25 into cell C26 (both cells display the rounded value)
Secondary voltage stresses on SRs are twice those calculated
Regards
Colin