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AL8806EV6

P1-P3P4-P6P7-P8
Issue 1 – June 2011
© Diodes Incorporated 2011
www.diodes.com
1 of 8
AL8806EV6 USER GUIDE
Performance
• 12VDC and 12VAC input
• 1.1A LED current
• Drives 1 to 3 LEDs in series
• 2% current regulation 9V to 30VDC
(with 2 LEDs)
• Ambient temperature range
-40°C to +105°C
Ordering Information
Order Number
AL8806EV6
Introduction
This evaluation circuit demonstrates the
AL8806 High Efficiency 30V 1.5A Buck LED
Driver operating in a circuit providing 1.1A
LED current in MR16 form intended to drive 1
to 3 high brightness LEDs in series with a total
load voltage drop up to 10V. The circuit
includes a 470µF reservoir capacitor to
prevent flicker for 50Hz or 60Hz AC input
power. EMC filtering is included to meet
international standards including the radiated
emission requirements of EN55015 and
EN55022 Class B.
The switching frequency is approximately
440kHz when driving 2 Osram Dragon
Diamond LEDs.
The construction uses a double-sided FR4
printed circuit board, 17 x 20 x 0.8 mm with
2oz/sq ft copper (70µm). Components are
mounted on both sides.
AL8806EV6
Issue 1 – June 2011
© Diodes Incorporated 2011
www.diodes.com
2 of 8
Quick Start Guide
Suitable Test Equipment
Count Description Manufacturer Part Number
1
Adjustable Power Supply, 12V
2A
Thurlby Thandar CPX400A
2 Digital Multimeter Fluke 179
1 Digital Storage Oscilloscope Tektronix TDS2024B
2
LED, high brightness, “Dragon
Diamond”, series connected on
suitable heat conducting PCB
Osram
Lamp Operation
1. Set the power supply to 12.0V but do not switch on. Set the current limit to 2.0A.
2. Connect up the AL8806EV6 board to the equipment as in Figure 1 below. Set DMM1 and
DMM2 to measure current up to 2A.
Figure 1: Test Schematic using VDC Input
3. Cover the LEDs to avoid dazzling.
4. Switch on the power supply. This should illuminate the LEDs. Note that the input current
(DMM1) is approximately 690mA. The output current (DMM2) is approximately 1.12A. The
input voltage can be varied from approximately 9VDC to 30VDC and the current regulation
observed is typically within ±2%.
CAUTION: The LEDs are very bright. Ensure
they are hidden from direct view, or covered
with a dispersing filter. The lid from an
aerosol can is convenient for this.
Also the LEDs are very hot. Do not touch!!
AL8806EV6
Issue 1 – June 2011
© Diodes Incorporated 2011
www.diodes.com
3 of 8
Observe Switching Waveform
5. The switching waveform can be observed on an oscilloscope.
6. Set the oscilloscope as follows:
Channel 1 sensitivity: 2V/div (at probe tip)
Time base: 1µs/div
Trigger Source: CH1
Trigger Mode: Auto
7. Connect the ground lead of a 10x probe to the supply negative terminal near P2 of the
AL8006EV2, and touch the probe tip onto the anode of D1 as in Figure 2 below. On the
oscilloscope, press RUN/STOP to capture the waveform. The cursor readout indicates a
switching frequency of 440kHz approximately.
Figure 2:
Figure 3: Oscilloscope Waveform
P1-P3P4-P6P7-P8

AL8806EV6

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Description:
BOARD LED DRIVER MR16 1A
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