**Part Number:**UCC28730-Q1

Dear Team,

Customer has been analyzing the UCC28730-Q1 datasheet, and raised some queries regarding the control. Please, can you give us your feedback?

**VCCR parameter**

*Datasheet: “The term VCCR is the product of the demagnetization constant, 0.432, and VCST(max)”*

I don’t clearly understand why the RCS formula uses VCCR instead of VCST.

I thought that I should calculate the Rcs by the maximum current peak of magnetizing inductance of transformer (Ipp) and the Vcst (voltage across resistor). So, using this equation:

→ Please, can you clarify?

**DMAGCC parameter**

*Datasheet: “DMAGCC is defined as the secondary diode conduction duty cycle during constant current, CC, operation. In the UCC28730-Q1, it is fixed internally at 0.432.”*

→ For calculation, I should consider 0.432 as the maximum Duty of demagnetization time. Right?

So, in voltage mode, it will be always lower.

thanks

regards,

Juri