Universal Input Buck Controller

Hello Catalin,

I suggest you go to the TI Designs page, click on the Power Supply tab, you'll have access to over 1,000 designs: http://www.ti.com/general/docs/refdesignsearchresults.tsp .  Click on the VIN MIN tab, sort by highest VIN.  I see two possible designs that are >320VIN.

If these do not meet your requirements or give you a starting point, please provide more details such as VOUT and IOUT, and some additional information as to the application/what is this supply powering?

~Leonard 

and another option, using WEBENCH, start with the UCC28630 ( www.ti.com/product/ucc28630 ), input your design parameters into the WEBENCH box at the right of the page and click OPEN DESIGN.

Thank you both.

Sorry for giving so little specifications. I will try to improve it.

---Specs---

• Input Voltage: Mains rectified voltage ~325 V DC  OR it could be the output voltage of a PFC stage with e.g. 360 VDC min and 400 VDC max and 390 VDC typical (it has to be decided, but you got the range..)
• Output Voltage = 62 V DC
• Output Current = 16 -17 A  (Output Power ~ 1 kW)
• No isolation necessary because the next stage is an inverter with galvanic isolation.

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So, given those specs, I have some questions:

1) Based on the topology selector page (http://www.ti.com/lsds/ti/power-management/pwm-resonant-controller-overview.page), I know Buck converter is not the suitable topology, however, is it possible to make one, even though it is not recommended ? (No isolation is necessary because the next stage of the design has galvanic isolation i.e. next stage is an inverter).

2)  In the Power Management section -> Non isolated DC/DC Switching regulator -> Buck controller external switch (http://www.ti.com/lsds/ti/power-management/buck-controller-external-switch-products.page#), I see the highest input voltage is 100 V buck controller. They do mention output voltage and output current as well (hence, power capability).

Ben Lough's recommendation in post #3 uses the UCC28881 controller with integrated MOSFET. It specifies the output current capability since it has a MOSFET built it. However, what I do not understand is that in the UCC28630, it does not have an integrated MOSFET, does not have any current specifications, but in the datasheet they do specify that it has a 60W output power (max). So my question is, why do they specify that, even though the controller does not even play a role in the power stage, meaning, it is not in the power path, has nothing integrated which would be in the power path ?

Is it only a recommendation ? Can 1 kW Buck converter be built with that controller (even though it is not the best solution) ? PD: I have used the WebBench designer tool but no design is available since it can not find a MOSFET to handle the current. I will figure out the MOSFET, I only care whether the controller chip will catch fire or not.

3) In my opinion, for 1 kW, the best SMPS topology would be between LLC , Full Bridge and Phase Shifted Full Bridge, do you agree ? If you do not agree, can you recommend what is the suitable topology for this case?

4) Can you recommend an IC controller for a topology given in question 3).

5) 1st page of the datasheet of UCC25600 says it is intended for 100W to 1 kW PSU, trying to build one for 1 kW would be too close to its maximum margin, or could be fine ?

Thank you very much for answering and wasting your time with me even though I was not clear from the very beginning.

Best regards,

Cata