service line

Telephone:(886) 3-6585656

Fax:(886) 3-6585252

LED Lighting


12-Channel LED Driver With Grayscale Adaptive Pulse Density Modulation Control
General Description

*※Data Rate 10Mbps@10m (distance between pixels) ※

The MY9221, 12-channels (R/G/B x 4) constant current APDM (Adaptive Pulse Density Modulation) LED driver, operates over a 3V ~ 5.5V input voltage range. The device provides 12 open-drain constant current sinking outputs that are rated to 24V and delivers up to 60mA of high accuracy current to each string of LED. The current at each output is programmable by means of three external current setting resistors.

MY9221 features a 10MHz EMI reduction data clock input. MY9221 also offers a 2-wire serial interface to send the grayscale data, control command including 16/14/12/8-bit grayscale selection, grayscale clock frequency division selection, output polarity selection for high power LED driving, output Tr/Tf timing selection, current output waveform selection, and to realize the internal-latch function. MY9221 provides adaptive pulse density modulation method to increase the visual refresh rate up to 1000 Hz @ 16-bit grayscale and reduce the flickers, and it also provides output current bilateral processing for EMI reduction. Moreover MY9221 utilizes clock duty recovery technique and pulse re-timing to help long distance and multiple cascading applications. MY9221 provides typical ±1% channel-to-channel LED current accuracy. Additional features include a ±0.1% regulated output current capability and fast output transient response.

MY9221 is available in a 20-pin QFN or 24-pin SSOP/TSSOP package and specified over the -40°C to +85°C ambient temperature range.

keyword:4*3-Channel LED Driver With 16bits Grayscale APDM Control, MY9221, LED RGB Strip, video display, MY-Semi Inc.

  • Indoor and Outdoor LED Video Displays
  • Full Color Mesh Display 
  • Full Color Dot Matrix Module
  • Architectural and Decorative Lighting
  • LCD Display Backlighting
Typical Operating Circuits 

MY9221-Operating circuits-2.jpg

  • 3V ~ 5.5V Operating supply voltage
  • R/G/B x4 Output Channels
  • 3~60mA/5V Constant current output range
  • 3~35mA/3.3V Constant current output range
  • 24V Rated output channels for long LED strings
  • ±1% (typ.) LED Current accuracy between channels
  • ±2% (typ.) LED Current accuracy between chips
  • 20Mbps (max.) data rate for EMI reduction [ patent pending ]   
  • 16 / 14 / 12 / 8 bit grayscale selection
  • Built-in internal grayscale clock supports refresh rate >1000Hz@16-bit grayscale
  • Grayscale clock frequency selection for High Power LED driving application
  • Grayscale clock source selection (SSOP & TSSOP only): internal or external
  • PWM or APDM control selection [ patent pending ]
  • Clock duty recovery for cascading application
  • Current setting by 3 external resistors
  • Schmitt trigger input
  • Output Current Tr / Tf programmable
  • Output Current Bilateral Processing for EMI reduction
  • -40°C to +85°C Ambient temperature range
Order Information
MY9221SS SSOP24-150mil-0.635mm 2500 pcs/Reel
MY9221QD QFN20-4mmx4mm-0.5mm 3000 pcs/Reel
MY9221TE TSSOP24-173mil-0.65mm 2500 pcs/Reel
(Exposed Pad)
Pin Configuration
   MY9221- Pin Configuration.jpg

5F-5, No.6, Taiyuan 1st St., Zhubei City, Hsinchu County, Taiwan, 30288

Telephone: 886 (3) 560-1668    Fax: 886 (3) 560-1600   Mail address: