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DN86 Datasheet(PDF) 5 Page - Zetex Semiconductors |
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DN86 Datasheet(HTML) 5 Page - Zetex Semiconductors |
5 / 8 page DN86 Issue 1 - October 2007 5 www.zetex.com © Zetex Semiconductors plc 2007 smoothed the ripple may drop below the combined LED forward voltage which stops the switching regulator and so reduces the average current in the LEDs. This will also reduce the average lumens output. Figures 5 to 7 show the input voltage ripple and LX voltage varying the input capacitance value Cin = C1 + C2 + C3. The higher the input capacitance the higher to output current precision and the average lumens outputs. The case with Cin=300µF has the best performance both as efficiency and current precision. Reducing the input capacitance the output current precision will decrease up to 25% with system efficiency always above 50%. Figure 5 Cin=300µF Figure 6 Cin=200µF C1 [µF] Vin [V] Iin[A] Vout[V] Iout[A] Efficiency Current Accuracy 100 12.70 0.303 9.28 0.225 54% 25% 150 12.60 0.394 9.50 0.271 52% 10% 200 12.53 0.432 9.55 0.293 52% 2% 300 12.50 0.386 9.70 0.295 60% 2% Table 3 AC input voltage |
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