Diodes Incorporated AL1783EV1

Overview

AL1783EV1 from Diodes Incorporated is an evaluation board for the AL1783 three-channel linear LED driver IC, designed for smart connected lighting systems. It supports 6.5–60V input, delivers up to 250mA per channel (750mA total), features independent PWM dimming per channel, ±4% current regulation accuracy, and integrated thermal fold-back/UVLO/LED open-short protection.

For engineers reviewing the AL1783EV1 datasheet, AL1783EV1 pinout, AL1783EV1 application, or AL1783EV1 equivalent, this board enables rapid validation of multi-channel LED current control, thermal management behavior, fault reporting via FAULTB, and PWM dimming performance at 1kHz/10kHz across architectural, industrial, and panel lighting designs.

Technical Context

The AL1783EV1 implements a linear constant-current architecture with three independent high-side current sinks, each regulated by an external RSET resistor (e.g., 24kΩ sets 250mA) using a 1.5V internal reference. Current regulation accuracy is ±4% over temperature and line variations.

It integrates real-time thermal monitoring with automatic current fold-back above threshold, UVLO (typ. 6.0V turn-on), overvoltage clamping, and LED string fault detection-reporting all events via open-drain FAULTB. Standby mode activates automatically when PWM signals are absent, eliminating need for an enable pin.

Key Specifications

Availability

AL1783EV1 is available at Aetrix Electronics and suitable for architectural lighting, industrial lighting, and panel light development requiring stable component supply, repeatable thermal validation, and multi-channel PWM dimming verification.

Supply support for AL1783EV1 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 manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and lighting applications.

The AL1783 product line targets smart, multi-zone LED lighting systems requiring precise per-channel current control, robust fault handling, and seamless integration with microcontroller-based dimming interfaces.

FAQ

What is the purpose of the AL1783EV1 evaluation board?

The AL1783EV1 is a fully assembled evaluation platform for the AL1783 three-channel linear LED driver IC. It allows engineers to validate current regulation accuracy, thermal fold-back response, PWM dimming linearity, and fault reporting behavior under real-world input voltage and load conditions without custom PCB design.

How do I set the LED current per channel on AL1783EV1?

Each channel's LED current is set by an external resistor (RSET) connected between REFX and GND. With VREF = 1.5V nominal, I_LED = 1.5V / (4000 × RSET). For example, a 24kΩ resistor yields 250mA per channel. The board includes 0805 footprints for R1–R3 to support user-defined current settings.

Does AL1783EV1 support standalone operation without a microcontroller?

Yes-AL1783EV1 operates without a microcontroller. It accepts direct PWM signals (1kHz or 10kHz) on P1 connectors (PWM1–PWM3) and automatically enters standby mode if no PWM activity is detected, reducing quiescent power consumption without requiring an enable signal.

What protections does AL1783EV1 demonstrate during testing?

The board demonstrates four key protections: input under-voltage lockout (UVLO), over-temperature protection (OTP) with fold-back and auto-recovery, LED string open-circuit detection, and LED short-circuit detection-all signaled via the FAULTB pin pulled low, enabling immediate system-level response.