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ZXSC410E6TA Datasheet(PDF) 8 Page - Diodes Incorporated |
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ZXSC410E6TA Datasheet(HTML) 8 Page - Diodes Incorporated |
8 / 17 page ![]() ZXSC410/ZXSC420/ZXSC440 Document number: DS33618 Rev. 6 - 2 8 of 17 www.diodes.com August 2015 © Diodes Incorporated ZXSC410/ZXSC420/ZXSC440 Application Information (cont.) LED Driving The ZXSC410/420/440 make simple low-voltage boost LED drivers; The current setting resistor value is determined by the following equation: LED FB LED R V I VFB GND RLED Open-Circuit Protection As a boost converter, if the load (LED chain) should become open-circuit, a Zener diode can be connected across the LED chain preventing overvoltage and possible damage to the main switching transistor. The Zener diodes should be selected by ensuring its voltage rating is higher than the combined forward voltage of the LED chain. Under open circuit conditions the current in the Zener diode defines the output current as: Z FB Z R V I The circuit example below give an open circuit output current of 300µA. VFB GND RLED RZ 1k Ω ZD1 To converter |
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