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ZXLD383ET5TA Datasheet(PDF) 6 Page - Zetex Semiconductors |
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ZXLD383ET5TA Datasheet(HTML) 6 Page - Zetex Semiconductors |
6 / 10 page ZXLD383 Issue 1 - September 2008 6 www.zetex.com © Diodes Incorporated www.diodes.com Low ripple LED current mode It is possible that the peak LED current required to achieve a given average current is either too high for the LED of choice or it leads to some loss of efficiency (due to LED resistance losses). In these cases, just two extra low cost components can be added to provide a low ripple current supply for the LED. The Schottky diode D1 and capacitor C1 rectifies and smoothes the output of the ZXLD383 giving a low ripple current supply to the load LED. Of course, this circuit could also be used to power loads other than LEDs. Note: VLED =3.5V, D1=ZHCS1000, C1 = 1uF (low ESR) Buck-boost mode Simple boost converters can run into problems when the input supply voltage is similar to or exceeds the intended load voltage as there is usually a direct current path from the power source through to the load via the boost inductor. This path does not require switching action and so is uncontrolled. When using the ZXLD383, this problem can be avoided by wiring the cathode of the load LED to Vcc rather than ground. Without switching action, the LED is reverse-biased and so no current can flow. When switching, the anode of the LED is driven to Vcc + Vf(led). The higher than normal output voltage reduces the available output current as described earlier and this is shown in the typical data provided. Note: VLED =3.5V L ILED (u H ) (m A ) 47 7.5 22 15.5 10 31 6.8 46 4.7 58 D1 LE D C1 Z XLD 383 3 2 1 4 EN A GN D VO U T 5 VC C L1 1. 5V NC L ILED (u H ) (m A ) 47 5.5 22 10.3 10 23.2 6.8 36.7 4.7 46.2 ZXL D 3 8 3 3 2 1 4 EN A GN D VO U T 5 VC C L1 LE D NC 3V |
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