AL5958

Description

The AL5958 is a 48-channel constant current sources matrix driver with M-PDM (Multiplex Pulse Density Modulation) control, supporting any dynamic applications from 0 scan to 32 scans. When connected to two devices, they can support up to 32 scans each device with 16 scans of integrated built-in nMOS switches.

The distinctive M-PDM technology increases the refresh rate of dynamic scanning systems without increasing the frequency of grayscale clock to prevent high clock frequency causing EMI interference. And the technique of automatic black frame insertion could abate efficiently the influence of blurs caused by the scanning switch and built-in intelligent matrix display functions. The device operates from 3V to 5V input voltage range and provides 48 constant current sourcing outputs that deliver up to 20mA of high accuracy current for each LED channel string. The current output of each color group can either be set by three different external current-sensing resistors or program a 6-bit global current control register.

The AL5958 provides a good channel to channel current accuracy and device to device current matching ±1.5% (typical).

The device operates over -40°C to +85°C ambient temperature range. The AL5958 is available in wettable W-QFN9090-76/SWP (Type A1) package.

Feature(s)

• Two Separated Power Supply: VR and VGB
  • VR Supply Range 2.8V to 5V
  • VGB Supply Voltage Range 3V to 5V
• 48 Output Current Sources:
  • 0.5mA to 20mA Constant Current Output Range
  • Current Setting by 3 External Resisters
  • Three 6-Bit Global Current Control for Each Color Group
  • ±1.5% (typ) LED Current Accuracy Between Channels
  • ±1.5% (typ) LED Current Matching Between Devices
  • Output Staggered Delay
• Built-in 16 NMOS Scan Switches
  • For Static and Dynamic Systems from 0 Scan to 1/32 Scan
  • Flexible Scan Sequence
• Built-in 3 x 16k Bits SRAM
• Grayscale PWM Dimming
• 16-Bit PWM Dimming Resolution
  • High Refresh Rate Achieved by Multiplex Pulse Density Modulation (M-PDM) Technology
  • Selectable Single or Double Edge Trigger Grayscale Clock for EMI Reduction
• Diagnosis and Protections
  • LED Open/Short, Grayscale Clock Watchdog
  • Undervoltage Lockout (UVLO)
• Intelligent Built-in Matrix Display Command Functions
  • Automatic Black Frame Insertion
  • Last Scan and Next Scan Line Ghost Image Abatement
  • Low Brightness Uniformity Compensation
  • Short LED Caterpillar & Open LED Fail Line Abatement
• Daisy-Chained Capability
• Sleep Mode to Save Power
• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• An automotive-compliant part is available under a separate datasheet (AL5958Q)

Application(s)

• Mini and micro-LED matrix display products
• RGB LED backlighting
• Gaming PC and keyboards
• Audio mixer indicators
• Music spectrum indicator equalizers
• LED luminous panels
• Local dimming backlights
• Film studio digital backgrounds