Lumissil IS31FL3248 LED driver

The IS31FL3248 is a 48-channel constant current LED driver with 16-bit PWM engine and 64 steps of current adjustment. LED current adjustment for channel and RGB group brightness can be programmed via a 33MHz serial interface. Programmable algorithms minimize audible noise that can result from MLCC decoupling capacitor.

Usage examples are LED control panels for commercial or industrial applications that include banks of 7-segment displays, single LED indicators as well as arrays of LEDs that form grids or panels for message boards or mini-LED backlighting. Cascade operation enables the control of large LED signage displays.

Key features

• 16-bit PWM and current adjustments for fine color tuning
• +/- 3% Current accuracy, channel-to-channel and part-to-part
• Programmable spread spectrum and phase delay for reduced EMI
• Real time LED open and short detection with over temperature protection

Additional features

• V_CC= 3.0V to 5.5V
• Tolerate up to 18V, nominal operation voltage between 4.5V to 16V, multiple LED’s can be connected in series
• Support 48 current sink output channels
  • 33mA@V_CC= 5V/channel maximum
  • 23mA@V_CC= 3V/channel maximum
     
• Maximum Current Band (CB)
  • 3-bit (8 steps) with a 9.7% to 100% range
     
• DC Current Scaling (SL)
  • 6-bit (64 steps) with a 25.9% to 100% range
     
• Individual 16-bit, 8+8-bit dithering, 8+4-bit dithering, 8-bit PWM mode
• Global Current Control (GCC)
  • 8-bit (256 steps) with a 9.6% to 100% range
  • 3 GCC sets for each color group
     
• Constant current accuracy
  • Channel to channel = ±3%(Max.)
  • Device to device = ±3%(Max.)
     
• Chain topology via VSB interface, PWM data I/O is daisy chained with bi-directional data transmission (write and read)
• Support bi-directional data output via DI
• Display timing reset
• Real-time LED open detection (LOD)
• Real-time LED short detection (LSD)
• Over temperature protection
• Spread Spectrums
• Software shutdown mode
• 180-degree phase delay operation to reduce power noise
• Operation temperature range: -40°C to +125°C
• eTQFP-64 (7mm×7mm) and QFN-64 (8mm×8mm) packages
• RoHS & Halogen-free compliance
• TSCA compliance

Applications

• Mini LED back light
• Center information display
• LED video displays
• Instrument control panel backlighting