Diodes Incorporated

AL8861
Demoboard AL8861EV2

AL8861EV2 EVALUATION BOARD USER GUIDE

Topology: Buck
Input Voltage (min.): 4.50 V
Input Voltage (max.): 40.00 V
Switching Frequency (max.): 1000.00 kHz

Original publication on 2017-12-04, revision 1 on

Description

The AL8861EV2, Figure 1, is a double sided evaluation board for the AL8861 step-down, or ‘buck’, LED driver with internal switch. The evaluation board is preset to drive 1.5A into a single LED, or multiple LEDs, the maximum number of which depends on their total forward voltage drop and the supply voltage. (The maximum drive current of the AL8861 is 1.5A)

Characteristics

  • Low BOM Counts
  • Wide Input Voltage Range: 4.5V to 40V
  • Output Current up to 1.5A
  • Internal 40V NDMOS Switch
  • Typical 5% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or PWM Signal
  • Recommended Analog Dimming Range: 5% ~100%
  • Soft-Start
  • High Efficiency (up to 97%)
  • LED Short Protection
  • Inherent Open-Circuit LED Protection
  • Rs Short Protection
  • Over Temperature Protection (OTP)
  • Up to 1MHz Switching Frequency
  • Pb-free TSOT25 and SOT89-5 Packages

Products

  Order Code SPEC Product series L
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Version Samples
744771122 PDF WE-PD SMT Power Inductor 22 3.37 3.77 31 36 13.5 Standard
744771220 PDF WE-PD SMT Power Inductor 220 0.96 1.2 290 400 3.8 Standard
744771215 PDF WE-PD SMT Power Inductor 150 1.21 1.43 185 230 4.4 Standard
74477120 PDF WE-PD SMT Power Inductor 100 1.53 1.7 150 160 6.6 Standard
744771133 PDF WE-PD SMT Power Inductor 33 2.68 3 49 57 11 Standard
744771147 PDF WE-PD SMT Power Inductor 47 2.21 2.6 72 75 9.2 Standard
744771168 PDF WE-PD SMT Power Inductor 68 1.91 2.19 96 120 7.6 Standard