AN75 データシートの表示（PDF） - Diodes Incorporated.

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AN75

High Power Factor LED Replacement T8 Fluorescent Tube using the AL9910 High Voltage LED Controller

Diodes Incorporated. 

AN75

Results

The performance of the system is outlined in Figures 4, and 5.

They display a level of system efficiency higher than 87% when driving 18 LEDs. The system

efficiency reduces with decreasing number of LEDs but 83% can still be achieved when driving

14LEDs at 264Vac input.

When driving 18 LEDs, a current regulation of around 3% is achieved between the input voltages of

110Vac to 264Vac. The LED current drops to 190mA at 85Vac as the minimum bus voltage VIN(min)

falls below the LED stack voltage (VLED(max)) during part of the AC line cycle, driving the LED off.

Figure 6 shows the power factor across the line voltage range. Power factor greater than 0.9 can be

achieved at 85Vac.

Figure 4 LED driver system efficiency

Figure 5 LED driver current regulation

Issue 1 – January 2011

10

© Diodes Incorporated 2010

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