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ZLED7000-ZI1R Datasheet(PDF) 11 Page - List of Unclassifed Manufacturers |
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ZLED7000-ZI1R Datasheet(HTML) 11 Page - List of Unclassifed Manufacturers |
11 / 20 page ZLED7000 40V LED Driver with Internal Switch 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 subject to changes without notice. 11 of 19 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 ADJ pin. This control signal must be capable of driving the ZLED7000’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 Table 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 ZLED7000. Figure 2.1 Directly Driving ADJ Input with a PWM Control Signal 7000 ZLED GND ADJ 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 ADJ 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 ADJ Pin ADJ GND ZLED7000 DC S ADJ DC _ OUT R V 079 . 0 I (2) Where IOUT_DC = Nominal average output current through the LED(s) with a DC control voltage VADJ = External DC control voltage: 0.3 V ≤ VADJ ≤ 1.2V RS ≥0.13Ω |
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