16-Channel, 16-Bit Grayscale PWM Dimming LED Driver-AL58263

Description

The AL58263 from Diodes is a 16-channel constant-current LED driver with 16-bit grayscale Adaptive Pulse Density Modulation (APDM) and supports error diagnostics, power-saving functionality, and current gain control. This distinctive APDM technology abates the non-ideal IOUT distortion due to non-symmetric transient responses and enhances the refresh rate by efficiently separating the frame waveform.

The device operates over a 3V to 5.5V input voltage range, 15V output channel voltage, fast 25MHz DCK input, and delivers up to 55mA of high-accuracy current to each LED string. Each channel’s output current can be programmable through a digital interface individually. All channels’ output current can be set by one external sensing resistor, along with a 6-bit global current control register.

The AL58263 has built-in diagnostics and LED open/short protection, including error detection. These error results are stored in a register for the MCU to read out.

The AL58263 is available in the TSSOP-24EP (Type A1-B) package and specified over the -40°C to +85°C ambient temperature range.

• Indoor and outdoor LED video displays
• Variable message signs (VMS)
• Traffic signs
• Outdoor billboard signage
• LCD display backlighting

Feature(s)

• Input Voltage VDD: 3V to 5.5V
• Output Current Range
  • 2~55mA/5V, 2~35mA/3.3V
  • ±0.1% Output current regulation capability
  • 6-bit global current control: from 12.5% to 200%
• 16 Constant-Current Sink Output Channel
  • 16-bit grayscale resolution with Adaptive Pulse Density Modulation control
  • 15V rated output channels for long LED strings
  • Fast Transient Response – supports external grayscale clock with double edge up to 16MHz
  • ±1.5% (typ.) LED Current accuracy between channels
  • ±3% (typ.) LED Current accuracy between chips
  • Non-scramble waveform for high power LED application
  • Grayscale counter reset selection
  • Grayscale data synchronization selection
• Diagnosis and Protections
  • Error detection includes LED Open, LED Short, Output port leakage, Output short-to-GND, Output short-to-Power and REXT short-to-GND
  • Error detection LEDs on at 0.1mA to avoid any flickering
  • Short detection threshold voltage selection (2/3/4/4.5V)
  • Sleep and 0-data mode to lower down the supply current
  • Pre-overtemperature warning
• 4-Wire Serial Interface (LAT, DI, DO, DCK)
  • 25MHz clock frequency for data transfer
  • EMI reduction grayscale clock
  • Cascaded capability (Max 1,440 devices)
  • External GCK watchdog
  • Stagger outputs delay for EMI reduction

     

    Diodes' AL58263 LED driver belongs to the category of advanced LED display lighting solutions. With its high level of integration, precise current control, and innovative APDM technology, this driver is suitable for a wide range of applications, including LCD backlighting, signage, automotive lighting, and architectural lighting. The ability to individually program each channel's output current and the enhanced refresh rates provided by APDM make the AL58263 an excellent choice for demanding LED lighting projects requiring high performance and accuracy.