Diodes AL8806 Manuel d'utilisateur télécharger pdf (Page 11)

AL8806

Document number: DS35144 Rev. 5 - 2

11 of 15

www.diodes.com

July 2013

L8806

Application Information (cont.)

PCB Layout

When laying out the PCB for the AL8806 the following should be observed:

1. The decoupling capacitor C1 has to be placed as close as possible to V

2. The sense resistor, R

SET

, has to be placed as close as possible to V

and SET

3. The anode of the freewheel diode (D1), the SW pin and the inductor have to be placed as close as possible to each other to avoid ringing.

AL8806

SET

CTRL

GND

SET

To avoid

radiated EMI

keep dashed

tracks as

short as

possible

Figure 6 PCB Layout

The AL8806 has two evaluation boards available on request (AL8806EV4 and AL8806EV6). Information can be found on the Diodes website and

from a Diodes’ sales representative.

Application Example

A typical application example for the AL8806 is the MR16 lamp; which normally operate from 12V

or 12V

supplies, using conventional

electromagnetic transformers or electronic transformers.

As a replacement for MR16 halogen lamps, LED lamps offer a more energy efficient solution - radiating no heat and no Ultra Violet light. The low

thermal impedance of the AL8806 and its 1.5A switch capability allows it drive some of the latest multi-die LEDs; which increases the lamp’s

luminance.

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 multi-die LED in the Lens section as well as EMI conformance.

Figure 7 MR16 Schematic

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Diodes AL8806 Manuel d'utilisateur Page 11