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UCC28C45-EP: RC Circuit

Part Number: UCC28C45-EP

Hi,

Good Day.

On the component datasheet, an example application schematic (sheets 9 & 10 – Figure 4) shows an RC circuit (see circled in red below) implemented between the Current Sense pin (#3) and the Primary of Transformer T1.

The customer is using the UCC28C45MDREP in a circuit without this RC and is nothing an inconsistent charging current. 

  1. What is the design intent of this RC network on the CS pin?
  2. Are we damaging the PWM controller without this RC network in our device?

Please advise. Thank you very much.

Best Regards,

Ray Vincent