64%

66%

68%

70%

72%

74%

76%

78%

10%

20%

30%

40%

50%

60%

70%

80%

90% 100%

Output Power

Efficiency

Efficiency @ 115V RMS

Efficiency @ 230V RMS

LC

S1

CS

D

PA

LC

P

K

R

R

t

N

R

L

´

´

´

´

=

(

)

(

)

OUT

OCC

RUN

OCC

DD

DD(on)

DD(off )

C

V

I

1 mA

I

C

V

V

1 V

´

+

´

=

-

-

UCC28710, UCC28711, UCC28712, UCC28713, UCC28714, UCC28715, UCC28716

www.ti.com

SLUSB86B – NOVEMBER 2012 – REVISED JULY 2015

(24)

9.2.2.7 VS Resistor Divider, Line Compensation, and Cable Compensation

The VS divider resistors determine the output voltage regulation point of the flyback converter, also the high-side

is initially determined based on transformer auxiliary to primary turns ratio and desired input voltage operating

threshold.

(25)

(26)

The UCC28710 family can maintain tight constant-current regulation over input line by utilizing the line

expected gate drive and MOSFET turn-off delay. Assume a 50-ns internal delay in the UCC28710 family.

(27)

On the UCC28710, UCC28714 and UCC28715 which has adjustable cable compensation, the resistance for the

desired compensation level at the output terminals can be determined using Equation 28.

(28)

9.2.3 Application Curves

Figure 22. Output at Startup at 115-V RMS

Figure 21. Efficiency

(No Load)

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