AL8843EV1 User Guide
AL8843EV1
Page 3 of 10
Dec 2017 www.diodes.com
Evaluation Board Schematic
Figure 3: Evaluation Board Schematic
Page 1: ...a DC voltage signal or a PWM signal The soft start time can be adjusted by an external capacitor from the CTRL Pin to Ground Applying a voltage of 0 3V or lower to the CTRL Pin will shut down the powe...
Page 2: ...oltage ref pin 2 5V This pin can be used to achieve dimming and for switching the output current off Leave floating for normal operation PWM Signal Input Remove C4 apply PWM signal to CTRL CTRL GND An...
Page 3: ...AL8843EV1 User Guide AL8843EV1 Page 3 of 10 Dec 2017 www diodes com Evaluation Board Schematic Figure 3 Evaluation Board Schematic...
Page 4: ...tion Leave CTRL pin floating for normal operation 3 Power Supply Connect the 5 40VDC to VIN GND pin to supply the system and AL8843 4 PWM Dimming Remove C4 apply a PWM signal low level 0 3V and high l...
Page 5: ...Generic 5 C1 C2 4 7uF 50V 1210 C1210X475K5RAC Generic KEMET X7R C3 100nF 100V 0805 Generic NMC0805X7R104K100 NIC Components X7R C4 Not Fitted 0805 Optional soft start capacitor C5 C6 1uF 100V 1206 Gen...
Page 6: ...nal Waveforms Switching waveform Vin 20V 3LEDs Y Vin R SW B CTRL G IL Start up waveform Vin 20V 3LEDs Y Vin R SW B CTRL G IL Soft Start waveform Vin 20V 3LEDs C4 10nF Y Vin R SW B CTRL G IL PWM Dimmin...
Page 7: ...PWM Dimming waveform Vin 20V 3LEDs PWM frequency 500Hz Duty 50 Y Vin R SW B CTRL G IL PWM Dimming waveform Vin 20V 3LEDs PWM frequency 500Hz Duty 20 Y Vin R SW B CTRL G IL LED open protection Vin 20V...
Page 8: ...5 10 15 20 25 30 35 40 1500 1600 1700 1800 1900 2000 2100 2200 I LED mA Vin V Vo 3 3V Vo 6 6V Vo 9 9V Vo 13 2V Vo 16 5V Vo 19 8V Vo 23 1V Vo 26 4V Vo 29 7V Vo 33V Functional Data Curves Efficiency vs...
Page 9: ...AL8843EV1 User Guide AL8843EV1 Page 9 of 10 Dec 2017 www diodes com Thermal Test Figure 6 Top Vin 20V 3LEDs Burn in time 60min Figure 7 Bottom Vin 20V 3LEDs Burn in time 60min...
Page 10: ...l or foreign patents pending Product names and markings noted herein may also be covered by one or more United States international or foreign trademarks This document is written in English but may be...
