Experimental results

AN2835

16/21

Doc ID 15073 Rev 1

20% difference to the rated value. Therefore a 100

Ω and 140 Ω dummy load is chosen for

constant power evaluation on bench. Please refer to Figure 16 and 17 for test results of the

lamp voltage and lamp current.

Figure 18 shows the input line voltage and current waveforms at 110 Vac and Figure 19 for

220 Vac, both bench measurements show the AC input simultaneous waveform, the input

current plot is very good and has extreme low distortion.

In steady-state, the input power (Pin), output power (Pout), operating efficiency and power

factor under 110 Vac and 220 Vac is shown in Table 3. Obviously the efficiency is over 88%

and the power factor is higher than 98%.

Figure 16.

Load with 100

Ω in steady-state

Figure 17.

Load with 140

Ω in steady-state

Upper: Output voltage 100 V/div

Lower: Output current 500 mA/div

Upper: Output voltage 200 V/div

Lower: Output current 500 mA/div

Figure 18.

Steady-state at 110 Vac input

Figure 19.

Steady-state at 220 Vac

Upper: Output voltage 200 V/div

Lower: Output current 1.0 A/div

Upper: Input voltage 200 V/div

Lower: Input current 500 mA/div