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ZLED7010 Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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ZLED7010 Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
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11 / 24 page  ZLED7010 40V LED Driver with Temperature Compensation Data Sheet August 12, 2010 © 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 PRELIMINARY and subject to changes without notice. 11 of 23 2.3.2. PWM Control The output current on LX can be set to a value below the nominal average value determined by resistor RS by using an external PWM signal as the control signal applied to the ADJI pin. This control signal must be capable of driving the ZLED7010’s internal 500kΩ pull-up resistor. See Figure 2.1 for an illustration. The minimum signal voltage range is 0V to 1.8V; the maximum voltage range is 0V to 5V. See section 1.3 for the specifications for the signal’s duty cycle DPWM. Any negative spikes on the control signal could interfere with current control or proper operation of the ZLED7010. Figure 2.1 Directly Driving ADJI Input with a PWM Control Signal S ADJ DC _ OUT R V 079 . 0 I ZLED GND ADJO 7010 ADJI 1.8V to 5V 0V PWM 2.3.3. External DC Voltage Control of Output Current The output current on LX can be set to a value below the nominal average value determined by resistor RS by using an external DC voltage VADJ (0.3 V ≤ VADJ ≤ 1.2V) to drive the voltage at the ADJI pin. This allows adjusting the output current from 25% to 100% of IOUTnom. See Figure 2.2 for an illustration. The output current can be calculated using equation (2). If VADJ matches or exceeds VREF (1.2V), the brightness setting is clamped at its maximum (100%). Figure 2.2 External DC Control Voltage at ADJI Pin ADJI ADJO GND ZLED7010 DC (2) Where IOUT_DC = Nominal average output current through the LED(s) with a DC control voltage VADJ = External DC control voltage: 0.3V ≤ VADJ ≤ 1.2V RS ≥0.13Ω |
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