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AP8802FNG-7 Datasheet(PDF) 5 Page - Diodes Incorporated |
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AP8802FNG-7 Datasheet(HTML) 5 Page - Diodes Incorporated |
5 / 13 page AP8802 1A LED Step-Down Converter AP8802 Rev. 1 5 of 13 MARCH 2009 www.diodes.com © Diodes Incorporated LED Current Control The LED current is controlled by the resistor RSET in Figure 2. Connected between VIN and SET the nominal average output current in the LED(s) is defined as: SET THD LED R V I = If the CTRL pin is driven by an external voltage (lower than 2.5V), the average LED current is: SET THD REF CTRL LED R V V V I = LED current Versus RSET and VCTRL 0.2 0.33 0.39 0.47 0.56 0.39 0.47 0.56 0.68 0.82 1 3 0.2 0.33 0.47 0.68 0.82 1 1.2 1.5 2 3 1.2 1.5 2 3 1 0.82 0.68 2 1.5 1.2 0 200 400 600 800 1000 1200 0 0.15 0.3 0.45 0.6 0.75 0.9 1.05 1.2 1.35 1.5 1.65 1.8 1.95 2.1 2.25 2.4 2.55 2.7 2.85 3 RSET value [Ohms] LED current @ VCTRL = 1.25V LED current @ VCTRL = 2.5V LED current @ VCTRL = 0.625V Figure 3: LED Current setting Vs RSET and VCTRL Application Information |
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Similar Description - AP8802FNG-7 |
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