MY9758A
3x16-Channel Common-Cathode LED Driver with NMOS Switches For Dynamic 1/32 Scanning Systems
General Description
The MY9758A, 3x16-channel constant current LED driver with M-PDM (Multiplex Pulse Density Modulation) control, supports any dynamic applications from 1/2 scan to 1/32 scan. The distinctive M-PDM technology enhances the refresh rate of dynamic scanning systems without increasing the frequency of grayscale clock in order to prevent from EMI interference. And the technique of automatic black frame insertion could abate efficiently the influence of blurs caused by the scanning switch.
The device operates over a 3.8V to 5V input voltage range (±10%) and provides 3x16 open-drain constant current sourcing outputs that delivers up to 20mA of high accuracy current to each string of LED.
The current output of each color group is programmable by means of an external current-sensing resistor and could be adjusted by 6-bit linear global current control.
The MY9758A provides ±2.5%(max.) channel current accuracy and ±2.5%(max.) chip current accuracy. Additional features include a ±0.1% (typ.) regulated output current capability and fast output transient response.
The MY9758A is available in a 76-pin QFN package.
Applications
- Indoor and Outdoor LED Video Displays
- Variable Message Sign (VMS)
- Dot Matrix Module
- Built-in NMOS switches (0.65A per channel)
- 3.8V ~ 5V G/B-LED and IC supply voltage (±10%)
- Min. 2.8V R-LED supply voltage
- 0.5~20mA Constant current output range
- 3x16-Channel for full color application
- ±2.5%(max.)LED Current accuracy between channels
- ±2.5%(max.) LED Current accuracy between chips
- Current setting by 3 external resisters
- 6-bit global current control for each color group
- Build-in 3x16K bits SRAM
- For static and any dynamic systems from 1/2 scan to1/32 scan
- Max. 16-bit grayscale resolution
- High Refresh rate achieved by Multiplex Pulse Density Modulation technology
- Selectable EMI reduction grayscale clock
- Automatic black frame insertion (Patent)
- Last scan and next scan line ghost image abatement
- Low brightness uniformity compensation
- Real time LED open/short detection
- Short LED caterpillar & open LED fail line abatement
- Current output staggered delay
- Grayscale enhancement
- Dynamic power saving & sleep mode
- Grayscale clock watchdog
- Flexible scan sequence
- Schmitt trigger input