UCC256402: Dual 24V/10A output configuration

Hi Manikanta,

Do you have any information how to build a transformer to support two outputs with LLC? The feedback can be supported by only either of outputs. Or should we use two LLC circuit?

case 1: 

48VDC ---- LLC(w/ trans) ---- 24VOUT1

                                          |-- 24VOUT2

case 2:

48VDC -------- LLC1(w/ trans) --- 24VOUT1

                |--- LLC2(w/trans) --- 24VOUT2

Regards,

Hisao Uhikoshi

Hi Hisao,

Total loading on this LLC is 480W? 240W on Output 1 + 240W on output 2. What's the application of this LLC? Why does customer wants to use LLC? is there any specific reason? I am asking because for 480W output and at 48V input, the input currents will be high. So, the LLC transformer would be bulky.

Regards

Manikanta P

Hi Manikanta,

Thank you for your comment. I understood that 480W(240W * 2) output with 48Vdc input is difficult. This will be used for external power supply from their CNC controller. As previously supported by you, the customer FANUC has used UCC256402 in 200Vin, DC24Vout, 15Aout(360W) applications. Therefore, we asked questions to see if UCC256402 could be used for this power supply requirement as well. Also we are requesting to PDS.

Regards,

Hisao Uchikoshi

Hi Hisao,

Since you are contacting PDS, can I close this thread?

Regards

Manikanta P

Hi Manikanta,

We are asking PDS but not asking if UCC256402 can support this output power supply. So is your thought that UCC256402 cannot support below power supply?

・ Vin=48V (Fluctuation range of 40V to 53V. Wider range than this is good.)
・Vout=24V
・ Iout=10A x 2 systems
・Isolation between Vin/Vout Isolation and between the two Vout systems

Regards,

Hisao Uchikoshi

Hi Manikanta,

Thank you for your comment. Which case do you recommend?

Hisao Uchikoshi said:

case 1: 

48VDC ---- LLC(w/ trans) ---- 24VOUT1

                                          |-- 24VOUT2

case 2:

48VDC -------- LLC1(w/ trans) --- 24VOUT1

                |--- LLC2(w/trans) --- 24VOUT2

Regards,

Uchikoshi

Hi Uchikoshi,

Could you eloborate case 2?

Could you show me the schematic for primary and secondary side connections?

Regards

manikanta P

Hi Manikanta,

Sorry for confusing you. Please ignore case 2. Do you have any note for case 1? Customer does not do any design yet. They just want to know if case 1 is realized with UCC256402.

Regards,

Uchikoshi