ZSLS7025 Boost LED Driver Brief Description Features The ZSLS7025, one of our ZSLS Family of LED control ICs, is a constant current boost converter designed for driving high-brightness LEDs. It is optimal for driving multiple white LEDs connected in series so that the LED current is uniform for better brightness and color control. The wide input range and high output current enables diverse industrial, after-market automotive, and consumer lighting applications. The ZSLS7025 output current is adjustable via an external current sense resistor and can deliver stable constant output current from a few milliamps up to 2A or higher. The ZSLS7025 drives a constant current into the load. The control loop features a pulse frequency modulated (PFM) architecture that is inherently stable and does not need loop compensation. The ZSLS7025 supports pulse-width modulation (PWM) or linear voltage dimming, which allows flexible control of the LED luminance. The ZSLS7025 can operate in applications with a wide input voltage range from 5V to 100V. An integrated over-voltage protection (OVP) circuit protects the system, even under no-load conditions. The over-voltage protection is adjustable via external resistors R1 and R2. Wide application input voltage range: 5V to 100V (Higher voltage supported. See section 2.1 in the data sheet.) Constant current output limited only by external component selection No loop compensation required Internal over-voltage protection Internal over-temperature protection Brightness control via PWM or DC voltage control signal input SOP-8 package Benefits High efficiency: up to 95% Minimum bill of materials Small form-factor package Available Support Demonstration Kit Physical Characteristics Junction temperature: -40°C to 125°C RoHS compliant For additional information on our LED driver family, visit www.zmdi.com/products/led-drivers/ ZSLS7025 Typical Application Circuit VIN =5 to 100 VDC L1 CIN RVDD ZSLS7025 VDD CVDD GATE TOFF CS ADJ FB GND RTOFF D1 Q1 R1 COUT LED String OVP RCS R2 RFB © 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.00 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. ZSLS7025 Boost LED Driver ZSLS7025 Block Diagram 5 to 100 VDC VIN L1 RVDD D1 5V Clamp VDD CIN Voltage Regulator Block 1 CVDD Current Mirror ZSLS7025 Vref1 (1.0V) Vref2 (0.3V) TOFF COUT 2 Vref3 (0.25V) RTOFF Vref4 (0.05V) + VDD - Vref4 50k ADJ 3 Vref1 + Q1 Blanking 500ns 900k S n LED R Q 100k GATE - 5 + FB CS + 6 Vref3 UVLO + Vref2 7 R1 - POR OVP + Vref1 8 RCS GND R2 RFB 4 Typical Applications Retro-fit Lighting Architectural/Building Lighting MR16 Lights Replacement Tubes SELV Lighting LED Backlighting Signage and Outdoor Lighting General Purpose Low-Voltage Industrial and Consumer Applications Ordering Information Product Sales Code Description Package ZSLS7025-ZI1R ZSLS7025 – Boost LED Driver SOP-8 (Tape & Reel) ZSLS7025KIT-D1 ZSLS7025PCB-D1 Demo Board, 1 ZLED-PCB10, and 5 ZSLS7025 ICs Kit Sales and Further Information Zentrum Mikroelektronik Dresden AG Grenzstrasse 28 01109 Dresden Germany ZMD America, Inc. 1525 McCarthy Blvd., #212 Milpitas, CA 95035-7453 USA Phone +49 (0)351.8822.7.533 Phone +855-ASK-ZMDI Fax +49 (0)351.8822.8.7533 (+855.275.9634) www.zmdi.com [email protected] Zentrum Mikroelektronik Dresden AG, Japan Office 2nd Floor, Shinbashi Tokyu Bldg. 4-21-3, Shinbashi, Minato-ku Tokyo, 105-0004 Japan ZMD FAR EAST, Ltd. 3F, No. 51, Sec. 2, Keelung Road 11052 Taipei Taiwan Zentrum Mikroelektronik Dresden AG, Korean Office POSCO Centre Building West Tower, 11th Floor 892 Daechi, 4-Dong, Kangnam-Gu Seoul, 135-777 Korea Phone +81.3.6895.7410 Fax +81.3.6895.7301 Phone +886.2.2377.8189 Fax +886.2.2377.8199 Phone +82.2.559.0660 Fax +82.2.559.0700 DISCLAIMER: This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Zentrum Mikroelektronik Dresden AG (ZMD AG) assumes no obligation regarding future manufacture unless otherwise agreed to in writing. The information furnished hereby is believed to be true and accurate. However, under no circumstances shall ZMD AG be liable to any customer, licensee, or any other third party for any special, indirect, incidental, or consequential damages of any kind or nature whatsoever arising out of or in any way related to the furnishing, performance, or use of this technical data. ZMD AG hereby expressly disclaims any liability of ZMD AG to any customer, licensee or any other third party, and any such customer, licensee and any other third party hereby waives any liability of ZMD AG for any damages in connection with or arising out of the furnishing, performance or use of this technical data, whether based on contract, warranty, tort (including negligence), strict liability, or otherwise. © 2012 Zentrum Mikroelektronik Dresden AG — Rev. 1.00 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.