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iW7027

16-Channel, External Current Sinks LED Driver with Patented 2-pin Sensing to Protect Against LED Shorts

iw7027-typical-applications-diagram.jpg

16-channel, external current sinks LED driver

The iW7027 is a 16-channel LED backlight driver that enhances TV picture quality and reduces BOM cost for 2D and 3D LCD TVs.  It uses external LED current sinks and up to two external DC/DC converters (boost, buck, LLC, etc.) for the LED driver to enable easy current and voltage scaling.  By integrating Dialog’s patented BroadLED™ technology, enabling a unique 2-pin LED open/short sensing technology to protect the external current sinks, the iW7027 eliminates the need for high voltage sensing components and reduces the required pin count resulting in a smaller, lower-cost package.  The BroadLED technology also enables the use of loosely binned LED arrays, further reducing the total BOM cost.

Dialog’s patented AnyMode™ dimming offers comprehensive, simple and flexible options to improve LED TV picture quality. It allows continuous PWM signals or burst PWM signals that are fully synchronized to the video frame at the same or higher frequency. The PWM duty cycle can be updated in each video frame and with user-configurable tail or head delays. This provides more options to reduce motion blur and improve the contrast ratio. A built-in PLL (phase-locked loop) further ensures jitter-free operation even with a noisy VSYNC signal.

Lifecycle status

● Active

Features

16-channel LED driver controller, unlimited LED voltage per channel

Patented BroadLED™ adaptive switch mode technology for high current matching at maximum efficiency

  • Enables patented 2-pin external LED open/short protection circuit
  • Enables use of cheaper, loosely binned LED arrays for lower BOM cost

TQFP-44 Package – reduced pin count and cost

Flexible input supply voltage rating:  5V/9V-16V

AnyMode™ comprehensive dimming control improves picture quality

  • High frequency PWM dimming up to 4kHz
  • Scanning-mode PWM dimming
  • Configurable phase-shift dimming
  • 8-bit analog dimming
  • 12-bit PWM dimming
  • Hybrid dimming (analog and PWM)

PWM dimming range: 0% to 99.9%

Scalable LED current

Supports 2D and 3D LCD TV modes

Supports patterned retarder (PR) and shutter glass (SG) 3D technologies

Comprehensive protection features:

  • Individual LED short protection
  • Channel-to-channel short protection
  • Current sink MOSFET drain-to-source short protection
  • Current sense resistor short protection
  • Microcontroller interrupt interface
  • LED open-fault detection
  • Over-temperature protection

Digitally controlled scanning mode

External LED current sink MOSFETs for maximum flexibility

SPI daisy-chain interface simplifies design when supporting more than 16 LED strings

Internal PLL ensures jitter-free operation even with noisy VSYNC signal

Reduces BOM costs

  • Digital control engine eliminates need for MCUs
  • 2-pin sensing removes need for external high voltage sensing components
  • 5V/9V-16V input supply voltage eliminates need for separate voltage rail

Applications

Direct and Edge-Lit LED TVs

Block Diagrams

iw7027-typical-applications-diagram.jpg

Typical applications diagram

iw7027-functional-block-diagram.jpg

Functional block diagram

To order a sample of any of our products, please complete the following form. We will provide up to five parts free of charge. Our sales department will provide pricing for samples orders exceeding five parts.

Sample Request Form

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Product Briefs and Summaries
Name Date Version
iW7027 Product Summary (629 KB) 30/03/2020 1.0