Texas Instruments UCC28780EVM-021, User Manual, Page: 9 / 28

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Performance Data and Typical Characteristic Curves
9 SLUUBV6 – August 2018
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Using the UCC28780EVM-021, 45-W, 20-V High-Density Silicon (Si) Based,
Active-Clamp Flyback Converter/Evaluation Module
5 Performance Data and Typical Characteristic Curves
5.1 Efficiency Typical Result of 4-Point Average
Table 3. Efficiency Test Data
V
IN
RMS P
IN
V
OUT
I
OUT
P
OUT
(%) EFFICIENCY
EFFICIENCY
4pt-
AVERAGE
Switching
Frequency @
Full Load
90 48.210 19.927 2.252 100% 93.08% 92.57% 179kHz
90 35.875 19.930 1.680 75% 93.33%
90 24.240 19.932 1.123 50% 92.34%
90 12.720 19.935 0.584 25% 91.53%
115 47.670 19.928 2.250 100% 94.06% 92.82% 224kHz
115 35.760 19.930 1.680 75% 93.63%
115 24.290 19.931 1.123 50% 92.15%
115 12.710 19.935 0.583 25% 91.44%
230 47.780 19.924 2.250 100% 93.82% 91.71% 288kHz
230 36.130 19.925 1.681 75% 92.70%
230 24.970 19.926 1.131 50% 90.25%
230 12.950 19.933 0.585 25% 90.04%
264 47.930 19.923 2.249 100% 93.48% 91.47% 291kHz
264 36.310 19.924 1.683 75% 92.35%
264 24.870 19.93 1.131 50% 90.63%
264 13.060 19.93 0.586 25% 89.44%
5.2 Efficiency Typical Results
Figure 5. Efficiency Over Load
Figure 6. Efficiency Over Input Voltage