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ZLED7010KIT-D1 Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers |
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ZLED7010KIT-D1 Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers |
2 / 24 page ZLED7010 40V LED Driver with Temperature Compensation © 2010 Zentrum Mikroelektronik Dresden AG — Rev. 1.1 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 ZLED7010, one of our ZLED Family of LED control ICs, is an inductive step-down converter that is optimal for driving a single LED or multiple LEDs (connected in series) from a voltage source greater than the voltage rating of the LED. The ZLED7010 operates in continu- ous mode. Capable of operating efficiently with voltage supplies ranging from 6 VDC to 40 VDC, it is ideal for low-voltage lighting applications. The ZLED7010 mini- mizes current consumption by remaining in a low-current standby mode (output is off) until a voltage of ≥0.3V is applied to the ADJI pin. In operating mode, the ZLED7010 can source LEDs with an output current of ≤ 750mA (≤ 30 watts of output power*) that is externally adjustable. The ZLED7010’s integrated output switch and high-side current sensing circuit use an external resistor to adjust the average out- put current. LED control is achieved via an external con- trol signal at the ZLED7010’s ADJI pin, implemented as a pulse-width modulation (PWM) waveform for a gated output current or a DC voltage for continuous current. The ZLED7010 provides a temperature compen- sation function for maintaining stable and reliable LED operation. LED over-temperature conditions are detected via a negative temperature coefficient (NTC) thermistor mounted close to the LEDs. If an over-temperature condition occurs, the NTC value reaches the value of a threshold resistor and the IC reduces LED current automatically. After the circuit recovers to a safe temperature, current returns to the set value. ADJO outputs and ADJI inputs of consecutive ICs can be interconnected as a driver chain deploying the temperature compensation information of the predecessor. This reduces the part count because only the first stage of the series requires an NTC. RNTC VIN RTH ADJI ADJO GND ISENSE LX ZLED7010 VS n LED L1 R3 NTC C1 1μF C2 100nF R2 50kΩ RS D1 47μH 6 to 40 VDC 12 8 5 7 6 3 4 * See section 2.3 for details Features Capable of 95% efficiency* Operates in continuous mode with a wide input range from 6 VDC to 40 VDC Integrated 40V power switch One-pin on/off or brightness control via DC voltage or PWM control signal Switching frequency: ≤ 1MHz Dimming rate: 1200:1 (typical) Output current accuracy: 5% (typical) Built-in temperature compensation and open-circuit protection for LEDs Thermal shutdown protection for the ZLED7010 Very few external components needed for operation Broad range of applications: outputs up to ≤750mA SOP-8 package Application Examples Illuminated LED signs and other displays LED traffic and street lighting (low-voltage) Architectural LED lighting, including low-voltage applications for buildings Halogen replacement LEDs (low-voltage) LED flood-lighting LED backlighting General purpose exterior and interior LED lighting, including applications requiring low-voltage General purpose low-voltage industrial applications ZLED7010 Application Circuit |
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