Diodes Incorporated AL8853EV1

Overview

AL8853EV1 from Diodes Incorporated is an evaluation board implementing the AL8853 constant-frequency peak-current-mode boost LED controller for high-efficiency, audio-noise-free constant-current LED driving. It delivers 800mA output current at up to 60V with >90% efficiency across 20–36V input, supporting PWM and analog dimming in LCD TV, monitor, and flat-panel display applications.

For engineers reviewing the AL8853EV1 datasheet, AL8853EV1 pinout, AL8853EV1 application, or AL8853EV1 equivalent, this board serves as a validated reference design with full schematic, BOM, PCB layout, and measured performance data-including efficiency vs. duty cycle, dimming linearity (1–100% PWM), load/line regulation (<0.6%), and comprehensive protection waveforms.

Technical Context

The AL8853EV1 implements a fixed-frequency (1 MHz typical) peak-current-mode boost topology using the AL8853 IC in SO-8 package. It integrates transconductance error amplification for precise current regulation and supports dual dimming modes: direct PWM input (5–50 kHz) and analog voltage control via the COMP pin.

Protection circuitry includes UVLO (16.5 V turn-on / 14.5 V hysteresis), OVP (2.0 V threshold on OVP pin), OCP (via CS pin sensing), OTP (160°C shutdown with 30°C hysteresis), LED open, cathode-short-to-GND (V_COMP ≥3.2 V for 37 ms), and output short detection (OVP <0.25 V).

Key Specifications

Availability

AL8853EV1 is available at Aetrix Electronics and suitable for LCD TV backlighting, flat-panel display power supplies, and industrial LED signage requiring stable component supply, rapid prototyping validation, and production-ready reference design reuse.

Supply support for AL8853EV1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and lighting applications.

The AL8853EV1 belongs to Diodes' LED driver evaluation platform family, designed specifically to accelerate development of high-efficiency, protection-rich boost-based constant-current LED drivers for commercial display systems.

FAQ

What is the primary function of the AL8853EV1 evaluation board?

The AL8853EV1 is a fully assembled demonstration board that implements the AL8853 boost LED controller IC to deliver regulated constant-current output for LED backlighting. It provides measurable performance data-including efficiency curves, dimming linearity, protection response waveforms, and thermal behavior-to validate design assumptions before custom PCB development.

Can AL8853EV1 operate in constant-voltage mode?

Yes-AL8853EV1 can be reconfigured for constant-voltage operation by modifying R10 (to 750 kΩ), replacing R11 with a 2.49 kΩ resistor, removing R12/R13, and substituting C7 with a 10 nF capacitor. This yields a stable 60 V output with up to 95% efficiency at 32 V input and 800 mA load.

Which protection features are implemented and how are they verified?

Verified protections include LED open (OVP pin >2.0 V), cathode-short-to-GND (V_COMP ≥3.2 V for 37 ms), output short (OVP <0.25 V), OTP (160°C shutdown with auto-restart at 130°C), UVLO, OCP, and diode/inductor short detection. All are demonstrated with oscilloscope waveforms in the user guide (Pages 5–6).

What are the physical dimensions and RoHS status of AL8853EV1?

The board measures 70 mm × 50 mm and is RoHS compliant per the user guide (Page 2). Its layout includes clearly labeled test points (VIN, GND, PWM, LEDA, LEDK) and uses industry-standard passive and active components-including SO-8 AL8853, TO252 MOSFET (DMT10H010LK3), PowerDI5 Schottky (SDT5H100P5), and EE1610 inductor.