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AL8805
Application Information (cont.)
Thermal and Layout Considerations
Figure 35 gives details about the PCB layout suggestions:
1.
2.
3.
the capacitor C1 has to be placed as close as possible to V IN
The sense resistor R1 has to be placed as close as possible to V IN and SET
The D1 anode, the SW pin and the inductor have to be placed as close as possible to avoid ringing.
Figure 35 Recommended PCB Layout
Application Example
Typical application example for the AL8805 is the MR16 lamp. They typically operate from 12V DC or 12V AC , using conventional electromagnetic
transformers or electronic transformers.
As a replacement in some halogen lamp applications LEDs offer a more energy efficient solution – providing no radiated heat and no Ultra Violet
light.
This application example is intended to fit into the base connector space of an MR16 style LED lamp. The design has been optimized for part
count and thermal performance for a single 3W LED in the Lens section.
AL8805
Figure 36 MR16 Schematic
An inductor choice of 33μH with saturation current higher than 1.1A, will limit the frequency variation between 230kHz and 350kHz over the
whole input voltage variation (8V to 18V), and therefore represent the best choice for an MR16 solution also taking into account the size
constraint of the lamp.
The AL8805 guarantee high level of performance both with 12V AC and 12V DC power supply.
The efficiency is generally higher than 81% and current regulation is better than 0.1mA/V in for a DC input voltage in the range from 8V to 18V.
In table 1 can be found the bill of material of the MR16 application example.
AL8805
Document number: DS35030 Rev. 4 - 2
13 of 16
www.diodes.com
July 2012
? Diodes Incorporated
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