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ZLED-PCB8 Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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2 / 28 page ZLED7720 High Current 40V LED Driver with Internal Switch © 2011 Zentrum Mikroelektronik Dresden AG — Rev. 1.2 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. Brief Description The ZLED7x20 continuous-mode inductive step- down converter family is part of our line of LED- control ICs. It is designed for applications requiring high brightness and high current. It can efficiently drive a single LED or multiple series-connected LEDs from a voltage input higher than the LED for- ward voltage: Vin = 6 to 40 VDC. It provides an adjustable output current ≤1.2A, which is set via an external resistor and controlled by the ZLED7x20’s integrated high-side output current-sensing circuit and high speed internal 40V power switch. An external control signal, which can be a DC voltage, PWM, or microcontroller-generated waveform, on the ADJ pin can also be used to linearly adjust a continuous output current or to control a gated out- put current. The output can be turned off by applying a voltage lower than 0.2V to the ADJ pin, which puts the ZLED7x20 in a low-current standby state. The ZLED7x20 enables diverse industrial and consumer lighting applications requiring high driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit pro- tection. The ZLED7x20 can also minimize bill-of- material costs because very few external com- ponents are required for most applications. Only a resistor, a diode, an inductor, and three capacitors are needed for a typical basic application. ZLED7x20 Typical Application Circuit Features • Up to 0.35A output current • Internal 40V power switch • Wide DC input voltage range 6 to 40 VDC • Output current accuracy: 3% (typical) • Dimming ratio: 1200:1 • LED open-circuit protection • Thermal shutdown protection Benefits • High efficiency: up to 98% • Single pin on/off and brightness control using DC voltage or PWM • Very few external components needed for operation • Footprint compatible to our ZLED7000 depending on the application. Available Support • Evaluation Kit Physical Characteristics • Operating temperature: -40°C to 105°C • Switching frequency: up to 1MHz ZLED7x20 Family Selection Matrix Product Max. Current Output Package ZLED7020 1.2A SOT89-5 ZLED7320 1.0A DFN-5 ZLED7520 0.75A DFN-5 ZLED7720 0.35A DFN-5 For additional information on our ZLED driver family, visit www.zmdi.com/products/led-drivers/ |
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