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Original question:

TIDA-01494: TIDA-01494

TIDA-01494: TIDA-01494 schematic

VAYSSE Pierre
Prodigy 20 points
Part Number: TIDA-01494
Other Parts Discussed in Thread: UCC256402, UCC256403

Hello,

I' m currently trying to assemble and (make it work) the TIDA-01494 reference design and I'm facing to difficulties regarding the assembly package. It seems the schematics (from which the BOM is derived) is not up to date regarding to the PCB. I found especially some inconsistencies in part references between schematics/BOM and PCB/assembly drawing:

in the LLC controller region:

  • Q14
  • Q4
  • R14
  • C21
  • R2
  • R25
  • C22
  • Q13
  • Q14
  • D12

in the PFC controller region:

  • D14

in the inrush limiter region:

  • R62
  • R63
  • R65
  • R66
  • D8
  • C58

(all the above components exist on the PCB but not in the current schematics neither in the BOM)

It would be nice to get the last version of the schematics to figure out what are the modifications applied on the initial design and get a chance of having something working at the end...

In addition to that list, I'm wondering why the R31 R22 R10 series resistors (1K5) are connected from mains voltage to the HV pin of U2 (pin1 of the LLC controller). It seems to be dangerous because in the DS of U2 it is stipulated that this pin should be tied to PGND (not mains !).

Thanks a lot in advance for helping us !

Regards

  • 0
    TI__Genius 9790 points

    Hi, Pierre

    U2 is UCC256402, pin 1 is HV pin which is used for high voltage startup, it is right that R31 R22 R10 series resistors (1K5) are connected from mains voltage to the HV pin of U2 (pin1 of the LLC controller).

    You may read datasheet of UCC256402, it is consolidate datasheet of UCC25640X family. In UCC25640X family, there is another PN is UCC256403, the HV pin of UCC256403 is recommended to connect to GND since the UCC256403 doesn't need HV startup.

    Regarding to the schematic and assembling, I recommend you to design a board by following the schematic since the schematic has no issue. 

    Yunsheng