DIODES INCORPORATED AL5873QEV1 Linear LED Driver User Guide

AL5873QEV1 User Guide
55V/250mA 3CHs Linear LED Driver

General Description

The AL5873Q is a three-channel linear LED driver with PWM dimming and analog dimming control. Each channel can drive up to 250mA with a total driving current up to 750mA. The LED channel current of the AL5873Q can be set through two reference resistors connected to the REF1 and REF2 pins.
The AL5873Q regulates LED current for each channel, accurate down to ±4%, with excellent dimming performance. The AL5873Q enters standby mode to save power if no PWM signal is detected.
The AL5873Q monitors the temperature and reduces the LED current if the chip temperature exceeds the threshold temperature. Moreover, the input under voltage lockout (UVLO), LED string open/short protection, overtemperature protection (OTP), and fault indicator (FAULTB) are designed to improve system robustness.

Applications

• Automotive aftermarket LED inner lamps
• Aftermarket rear lights – tail and stop lights, rear turn indicators, parking lights, fog lights, reverse lights

Key Features

• Wide Input Voltage Range from 5V to 55V
• Each Channel up to 250mA Current Capability
• Set Stop and Tail Current Independently Through Two Resistors
• Switch LED Current Between Stop and Tail Function Automatically via FULL Input
• PWM Dimming via Both PWM Input and Power Supply
• Analog Dimming via ADIM Input
• Automatically Enter and Exit Standby Mode Without Enable Pin
• Internal Protections:
  • Input Undervoltage Lockout (UVLO)
  • LED String Open Protection
  • LED String Short Protection
  • Over Temperature Protection (OTP)
• Thermal Fold-Back if Chip Temperature Exceeds the Threshold
• Fault Reporting: UVLO, OTP, LED Open, and LED Short

AL5873QEV1 Specifications

Connection Instructions & Quick Start Guide

1. Ensure that the DC source is switched OFF or disconnected before soldering or connecting.
2. By default, the LED current of evaluation board is preset at 125mA per channel.
3. Connect the anode wire of external LED string to LEDA of J7 connector.
4. Connect the cathode wire of external LED string to LED1~LED3 of J7 connector.
5. Power Supply Input: 5~55VDC between TAIL and GND for TAIL mode;
6. Power Supply Input: 5~55VDC between STOP and GND for STOP mode
7. 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.
8. Turn on the main switch. LED string should light up.
9. For PWM dimming operation, remove the jumper on J1, and supply 200Hz~2kHz PWM signal on PWM terminal. PWM dimming operation is available in STOP mode.
10. For analog dimming operation, ensure J1 is shorted by jumper; supply a 0-1.5VDC signal on ADIM terminal. This operation is available both in STOP mode and TAIL mode.
11. This board supports FAULTB signal output. Pull FAULTB to VIN by short J2 with a jumper, otherwise FAULTB is pulled high by AL5873Q internal block.

Evaluation Board Schematic

Evaluation Board Layout

Bill of Material

Operating Waveforms:

• Turn On & Off
• Stable Operating
• PWM Dimming
• Analog Dimming
• Dimming Curve

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

IMPORTANT NOTICE

1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE
   IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design with Diodes’ products. Diodes’ products may be used to facilitate safety-related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of Diodes’ products for their intended applications, (c) ensuring their applications, which incorporate Diodes’ products, comply the applicable legal and regulatory requirements as well as safety and functional-safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality control techniques, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications.

3. Diodes assumes no liability for any application-related information, support, assistance or feedback that may be provided by Diodes from time to time. Any customer or user of this document or products described herein will assume all risks and liabilities associated with such use, and will hold Diodes and all companies whose products are represented herein or on Diodes’ websites, harmless against all damages and liabilities.

4. Products described herein may be covered by one or more United States, international or foreign patents and pending patent applications. Product names and markings noted herein may also be covered by one or more United States, international or foreign trademarks and trademark applications. Diodes does not convey any license under any of its intellectual property rights or the rights of any third parties (including third parties whose products and services may be described in this document or on Diodes’ website) under this document.

5. Diodes’ products are provided subject to Diodes’ Standard Terms and Conditions of Sale ( https://www.diodes.com/about/company/terms-and-conditions/terms-and-conditions-of-sales/ ) or other applicable terms. This document does not alter or expand the applicable warranties provided by Diodes. Diodes does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.

6. Diodes’ products and technology may not be used for or incorporated into any products or systems whose manufacture, use or sale is prohibited under any applicable laws and regulations. Should customers or users use Diodes’ products in contravention of any applicable laws or regulations, or for any unintended or unauthorized application, customers and users will (a) be solely responsible for any damages, losses or penalties arising in connection therewith or as a result thereof, and (b) indemnify and hold Diodes and its representatives and agents harmless against any and all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim relating to any noncompliance with the applicable laws and regulations, as well as any unintended or unauthorized application.

7. While efforts have been made to ensure the information contained in this document is accurate, complete and current, it may contain technical inaccuracies, omissions and typographical errors. Diodes does not warrant that information contained in this document is error-free and Diodes is under no obligation to update or otherwise correct this information. Notwithstanding the foregoing, Diodes reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes.

8. Any unauthorized copying, modification, distribution, transmission, display or other use of this document (or any portion hereof) is prohibited. Diodes assumes no responsibility for any losses incurred by the customers or users or any third parties arising from any such unauthorized use.

9. This Notice may be periodically updated with the most recent version available at https://www.diodes.com/about/company/terms-andconditions/important-notice

The Diodes logo is a registered trademark of Diodes Incorporated in the United States and other countries.
All other trademarks are the property of their respective owners.
© 2023 Diodes Incorporated. All Rights Reserved.

Rev. 1
AL5873QEV1
www.diodes.com
December 2023
© 2023 Copyright Diodes Incorporated.
All Rights Reserved.

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