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ZLED7010 Arkusz danych(PDF) 11 Page - List of Unclassifed Manufacturers

Numer części ZLED7010
Szczegółowy opis  40V LED Driver with Temperature Compensation
PDF  24 Pages
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ZLED7010 Arkusz danych(HTML) 11 Page - List of Unclassifed Manufacturers

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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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