Data Sheet Rev. 1.0 / June 2011 ZLED7X20 Family High Current 40V LED Driver with Internal Switch ZLED7X20 Family High Current 40V LED Driver with Internal Switch Brief Description Features The ZLED7X20 continuous-mode inductive step- Up to 1.2A output current down converter family is part of our line of LED- Internal 40V power switch control ICs. It is designed for applications requiring Wide DC input voltage range 6 to 40 VDC high brightness and high current. The ZLED7X20 Output current accuracy: 3% (typical) can efficiently drive a single LED or multiple Dimming ratio: 1200:1 series-connected LEDs from a voltage input higher LED open-circuit protection than the LED forward voltage: Vin = 6 to 40 VDC. It provides an adjustable output current 1.2A, Thermal shutdown protection which is set via an external resistor and controlled by the ZLED7X20s integrated high-side output current-sensing circuit and high speed internal 40V Benefits power switch. An external control signal, which can High efficiency: up to 98% be a DC voltage, PWM, or microcontroller-gener- Single pin on/off and brightness control using ated waveform, on the ADJ pin can also be used DC voltage or PWM to linearly adjust a continuous output current or to Very few external components needed for control a gated output current. operation The output can be turned off by applying a voltage Footprint compatible to our ZLED7000 lower than 0.2V to the ADJ pin, which puts the ZLED7X20 in a low-current standby state. The ZLED7X20 enables diverse industrial and Available Support consumer lighting applications requiring high Evaluation Kit driving currents, wide operating voltage range, high efficiency, and variable brightness control. It offers over-temperature and LED open-circuit protection. The ZLED7X20 can also minimize bill- Physical Characteristics of-material costs because very few external Operating temperature: -40C to 105C components are required for most applications. Switching frequency: up to 1MHz Only a resistor, a diode, an inductor, and three SOT89-5 package capacitors are needed for a typical basic application. DFN-5 package For additional information on our ZLED driver family, visit www.zmdi.com/products/led-drivers/ ZLED7X20 Typical Application Circuit Vs = 6 to 40 VDC Rs D1 (C3) LED Vin I SENSE String L1 (C1) C2 ZLED7020 0.1F LX 33H to ADJ 220H GND 2011 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.