Diodes Incorporated

AL8807
Demoboard AL8807EV4

AL8807EV4 USER GUIDE

Topology: Buck
Input Voltage (min.): 12.00 V
Input Voltage (max.): 12.00 V
Output 1: 10.00 V / 1.100 A

Original publication on 2012-05-01, revision Issue 2

Description

This evaluation circuit demonstrates theAL8807 High Efficiency 30V 1.5A Buck LEDDriver operating in a circuit providing 1.1ALED current in MR16 form intended to drive 1to 3 high brightness LEDs in series with a totalload voltage drop up to 10V. The circuitincludes a 470μF reservoir capacitor toprevent flicker for 50Hz or 60Hz AC inputpower. EMC filtering is included to meetinternational standards including the radiatedemission requirements of EN55015 andEN55022 Class B.The switching frequency is approximately440kHz when driving 2 Osram DragonDiamond LEDs.The construction uses a double-sided FR4printed circuit board, 17 x 20 x 0.8 mm with2oz/sq ft copper (70μm). Components aremounted on both sides.

Characteristics

  • 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

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Bauform Version Samples
744777115 PDF WE-PD SMT Power Inductor 15 1.6 2.2 70 81 19.5 7345 Standard