TV power supply, 310W, PFC using UCC28063,
The problem is described as follows:
Output light load to heavy load, PFC voltage will drop to 240V.
UCC28063 has no drive output.
The following picture:
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TV power supply, 310W, PFC using UCC28063,
The problem is described as follows:
Output light load to heavy load, PFC voltage will drop to 240V.
UCC28063 has no drive output.
The following picture:
Can you first probe IC1 VCC to see if it is in normal operation range?