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ZLED7012 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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9 / 16 page ZLED7012 Low-Voltage Four-Channel LED Driver Data Sheet November 9, 2010 © 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.0 All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. The information furnished in this publication is subject to changes without notice. 9 of 15 Figure 1.5 Efficiency (%) over the VCC Range (2.8V to 5.5V) at 25°C 2 Circuit Description 2.1. Block Diagram 2.2. ZLED7012 Overview The ZLED7012 is a low-noise, constant-frequency charge pump DC/DC converter for driving up to four LEDs with constant current at a level controlled via a PCC serial digital interface, providing a uniform and linear brightness progression. Its 20mA (maximum) current output per LED channel is optimal for low-voltage or battery-powered applications, such as portable applications powered by 1-cell lithium batteries. The ZLED7012’s current sinks can operate in parallel for driving higher current LEDs. Only a few, small external components are needed for typical applications. The ZLED7012’s charge pump operates at a fixed frequency (1MHz typical) with minimal noise and harmonics. |
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