WLED driver integrates a 48-V MOSFET to provide a complete backlighting solution
June 30, 2010 // Paul Buckley
Maxim Integrated Products has introduced a six-string WLED driver that provides a complete backlighting solution for notebooks and netbooks. The high-performance step-up controller integrates a 48 V MOSFET capable of driving up to 13 LEDs/string.
The integration reduces BOM cost and saves board space by eliminating an external MOSFET. The step-up controller frequency can be programmed from 250 kHz to 1MHz, allowing flexibility in selecting external components. The MAX17127 features a wide input-voltage range (5 V to 26 V), making it well suited for both netbooks that use a 2- to 3-cell Li+ battery and notebooks that use a larger battery.
The current in each string can be programmed from 10 mA to 30 mA using an external resistor, which helps in setting the appropriate brightness level. Meanwhile, better than ±2 percent accurate current matching between strings ensures even LED brightness. The MAX17127 operates in a direct-dimming mode with a dimming frequency ranging from 100 Hz to 25 kHz. The LED current is directly controlled by the external dimming signal's frequency and duty cycle. The wide dimming range eliminates the audible noise issues usually encountered in WLED drivers. A low feedback voltage at each LED string helps reduce power loss and improve efficiency.
The MAX17127 offers multiple features to protect the controller from faults, including overcurrent, overtemperature, and open-/short-string conditions. Additionally, the step-up controller has cycle-by-cycle current limiting and soft-start capability to control inrush current.
Availability and Pricing
The MAX17127 is available in a 4 mm x 4 mm, 20-pin TQFN package and operates over the -40 to +85 degrees Celsius extended temperature range. Prices start at 0.73 US Dollars (1000-up, FOB USA).
Thin film solar cells may rival silicon
July 07, 2015
A consortium of eleven European partners in eight countries claims to have an effcient alternative to silicon that achieves ...
3D printing for photonics: a British initiative
It's crunch time (again) for EUV lithography
Digi-Key to distribute Monolithic Power Systems worldwide
Autonomous taxis would be green and cost effective says study
What she sees is what you get
July 06, 2015
360º video is an ongoing experiment, something that's technically feasible, yet whose consumer use-cases are not quite well ...
Prototyping in silicon photonics boosted by European collaboration
Private equity makes moves on GaN startup
TSMC overtakes Intel in chip capex ranking
- Critical Requirements in High Speed Signal Generation Applications
- The 400XAC Series: Two Major Advantages that Simplify Functional Testing
- A Smart Way to Drive ECU Consolidation
- Autonomous Driving: An Eye on the Road Ahead
InterviewCEO interview: Cadence is about enablement, collaboration
EDA companies are being asked to provide expertise from the circuit- to the system-level observes Lip-Bu Tan, CEO of EDA software vendor Cadence Design Systems Inc. Covering such a breadth of endeavour ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.