AN2761 datasheet(30/36 Pages) STMICROELECTRONICS

30 / 36 page

Test results and significant waveforms

AN2761

30/36

Doc ID 14690 Rev 2

The power factor (PF) and the total harmonic distortion (THD) have been measured and are

illustrated in Figure 21 and 22. As shown, the PF measured at full load and half load

remains close to unity throughout the input voltage mains range while, when the circuit is

delivering 20 W, it decreases at high mains range. THD is low, remaining within 16% at

maximum input voltage.

The efficiency is very good at all load and line conditions. At full load it is always significantly

higher than 90%, making this design suitable for high-efficiency power supplies.

The measured output voltage variation at different line and load conditions is illustrated in

Figure 24

. As shown, the voltage is perfectly stable over the entire input voltage range. Just

at 265Vac and light load, there are negligible deviations of 1 V due to the intervention of the

burst mode function.

Figure 21.

EVL6562A-TM-80W

power factor vs. Vin and load

Figure 22.

EVL6562A-TM-80W

THD vs. Vin and load

0.800

0.825

0.850

0.875

0.900

0.925

0.950

0.975

1.000

130

180

230

280

Vin (Vac)

Pout = 80W

Pout = 40W

Pout = 20W

130

180

230

280

Vin (Vac)

Pout = 80W

Pout = 40W

Pout = 20W

Figure 23.

EVL6562A-TM-80W

efficiency vs. Vin and load

Figure 24.

EVL6562A-TM-80W

static Vout regulation vs. Vin and

load

130

180

230

280

Vin (Vac)

Pout = 80W

Pout = 40W

Pout = 20W

Pout = 5W

392

393

394

395

396

397

398

399

400

130

180

230

280

Vin (Vac)

Pout = 80W

Pout = 40W

Pout = 20W

Pout = 5W

AN2761 Datasheet(PDF) 30 Page - STMicroelectronics

AN2761 Datasheet(HTML) 30 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

Datasheet Download

Link URL