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UCC39002EVM: UCC39002EVM:

Part Number: UCC39002EVM
Other Parts Discussed in Thread: UCC39002

We are trying to apply the UCC39002 evaluation board to two 12V modules and although the load was shared, we observed a significant degradation in the modules’ load regulation performance. Turning off one module resulted the same degradation. Further testing revealed, with one module off, that CSO and EAO were at ~100mV (at no load), and ADJ was drawing current. Our understanding is the master’s ADJ output should not draw current. With the other module off the behavior was the same.

 Is our understanding incorrect?

 Should we assume that the EVB is defective?

 Is there procedure to verify functionality?

R10 = 10 milliOhm
R11 = Open
R7, R19, = 1k
C1, C4 = 33pF
R16, R22 = 100K
R25 = 150 Ohms
C12 = 47 uF
R30 = 10 Ohms
Power Module TDK/Lambda PN PAH300S48-12
Load =0 to 6A

The second half is identical.
VDD for the third section was 0V

We would appreciate your consideration of this matter

Paul Augenstein
Pyragon Inc, Rochester NY
585 489 9548