DIODES AL5810QEV4 Adjustable 60V Linear LED Driver User Guide

DIODES AL5810QEV4 Adjustable 60V Linear LED Driver

General Description

The AL5810 Linear LED driver offers excellent temperature and voltage current stability with output adjustable handling capability. The AL5810 simplifies the design of LED drivers by setting the LED current with an external resistor using standard value resistors.

The AL5810 has an open drain output that can swing from 2.0V up to 60V supply voltage enabling it drive long LED chains for high-side or low-side LED strings. Its low 0.5V RSET pin is outside of the LED current path and can maintain current accuracy while minimizing the required overheads to regulate the LED current. This reduces its power dissipation compared to traditional linear LED drivers, making it ideal for driving  LEDs up to 250mA.

The AL5810 is available in the Wettable Flank W-DFN2020-3 (2mm x 2mm), power dissipation (PDIS) up to 2W and TO-252 (DPAK) package, (PDIS) up to 3.8W.

Applications

• Decorative Lighting
• Display Signage
• AC Lighting Panels
• LED Strings for Dome and Mood Lighting
• Instrumentation Illumina

Key Features

• 2.0V to 60V Wide Input Voltage Range
• An external resistor for 100mA setting (Typ. 7.5kΩ)
• Low Reference Voltage (VRSET = 0.5V)
• Adjustable Sink or Source LED Current Up to 200mA/250mA (WDFN2020/TO-252)
• ±5% LED Current Tolerance @Room Temp
• Parallel Devices to Increase Regulated Current
• Over Temperature Shutdown
• 40°C to +105°C Ambient Temperature Range
• Wettable W-DFN2020-3 (2mm x 2mm), PDIS up to 1.62W, TO-252 (DPAK), PDIS up to 3.8W
• Totally Lead-Free & Fully RoHS Compliant
• Halogen and Antimony Free “Green” Device

AL5810QEV4 Specifications

EVB Physical Picture

Connection Instructions

Power Supply Input: 4.5~16VDC (VIN, GND);
Connect LED string between “HS LED+” and “HS LED-” for high side connection;
Connect LED string between “LS LED+” and “LS LED-” for low side connection;
For PWM dimming operation: supply a 0-3.3V 200Hz~500Hz signal between PWM & GND.

Quick Start Guide

1. By default, the LED current of evaluation board is preset at 50mA per channel.
2. Ensure that the DC source is switched OFF or disconnected before soldering or connecting.
3. For LED high side connection
   • Connect the anode wire of external LED string to HS LED+;
   • Connect the cathode wire of external LED string to HS LED-;
   • J1 & J4 are open, J2&J3 are shorted by Jumper (Default);
   • For PWM dimming operation, J1,J3 & J4 are open, J2 is shorted by Jumper.
4. For LED low side connection
   • Connect the anode wire of external LED string to LS LED+;
   • Connect the cathode wire of external LED string to LS LED-;
   • J1 & J2 are open, J3&J4 are shorted by Jumper;
   • PWM dimming operation is NOT supported in low side connection.
5. Connect two DC line wires to the VIN and GND terminals on the evaluation board.
6. Ensure that the area around the board is clear and safe, and preferably that the board and LEDs are enclosed in a transparent safety cover.
7. Turn on the main switch. LED string should light up.

Evaluation Board Schematic

Evaluation Board Layout

Bill of Material

System Performance

Test @ LED voltage = 5.46V

PWM Dimming Curve
Test @VIN=12V, LED voltage=5.46V

PWM Dimming Curve (Fpwm=200Hz)

Waveforms:

Turn ON:

Turn OFF:

BCI Test:

EVB can pass ISO11452-4 200mA BCI test without LED flicker and output current decrease.

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