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PDF ZLED7000 Data sheet ( Hoja de datos )
| Número de pieza | ZLED7000 | |
| Descripción | 40V LED Driver | |
| Fabricantes | ZMD | |
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Data Sheet
Rev. 1.0 / June 2010
ZLED7000
40V LED Driver with Internal Switch
www.DataSheet4U.com
1 page  
ZLED7000
40V LED Driver with Internal Switch
www.DataSheet4U.com
List of Figures
Figure 2.1 Directly Driving ADJ Input with a PWM Control Signal ................................................................................. 11
Figure 2.2 External DC Control Voltage at ADJ Pin....................................................................................................... 11
Figure 2.3 Driving ADJ Input from a Microcontroller ...................................................................................................... 12
Figure 3.1 Output Ripple Reduction .............................................................................................................................. 15
Figure 6.1 Pin Configuration and Package Drawing SOT89-5 ...................................................................................... 17
List of Tables
Table 1.1 Absolute Maximum Ratings............................................................................................................................ 6
Table 1.2 Operating Conditions...................................................................................................................................... 6
Table 1.3 Electrical Parameters ..................................................................................................................................... 6
Table 4.1 Pin Description SOT89-5.............................................................................................................................. 17
Table 4.2 Package Dimensions SOT89-5 .................................................................................................................... 17
Data Sheet
June 1, 2010
© 2010 ZMD AG — Rev. 1.0
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.
5 of 19
5 Page 
ZLED7000
40V LED Driver with Internal Switch
www.DataSheet4U.com
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
1.8V to 5V
0V
PWM
ZLED7000
ADJ GND
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
ZLED7000
ADJ GND
DC
I OUT _ DC
0.079 VADJ
RS
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
(2)
Data Sheet
June 1, 2010
© 2010 ZMD AG — Rev. 1.0
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.
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