Kinetic Technologies Releases High Efficiency LED Driver for Tablets
PWM-Control Mixed-Mode Dimming Combines Low Noise and Low Duty Cycle Operation
Sunnyvale, Calif. – September 9, 2014 – Kinetic Technologies, a high-performance analog and mixed-signal semiconductor company focused on developing power management solutions for computing, consumer, industrial, and communications markets, today introduced the KTD3156, a 6 channel LED backlight driver featuring PWM-Controlled, Mixed-Mode Dimming. The KTD3156 is ideal for use in single cell Lithium-ion battery-based equipment, including Portable DVD Players, Notebooks, Netbooks, but specifically high resolution LCD displays in Tablets.
The KTD3156 is one of the most advanced, and full-featured LED backlight drivers in the market, specifically targeted at Tablet LCD displays. As one of the many backlight products from Kinetic Technologies’ Display & Lighting Product Line, the KTD3156 provides an extremely wide dimming ratio necessary in today’s high definition tablet displays.
The KTD3156 is the ideal power solution for LED backlighting in medium to large size LCD panels. It is a highly integrated step-up DC-DC converter with input voltage from 2.7V to 5.5V, accommodating 1-cell lithium ion batteries or 5V supply. KTD3156 integrates a 40V power MOSFET as well as six current sinks, which results in a simpler and smaller solution with fewer external components. High switching frequency allows the use of a smaller inductor and capacitor to further reduce the solution size. Each of the six current sinks regulates up to 30mA. With a 40V rated output, each string of the boost can connect up to 10 LEDs in series, for a total of 60 LEDs.
Featuring mixed-mode dimming, the KTD3156 switches between PWM dimming at a low dimming duty cycle and analog (DC current) dimming at high dimming duty cycles to increase the total power efficiency. The transition point of these two modes is programmable to 12.5% or 25% PWM duty cycle. The PWM dimming mode’s output PWM dimming frequency can be programmed to fixed 22kHz or following input PWM dimming frequency. For fixed 22kHz output PWM dimming, phase shift function is implemented among these six channels to further lower the input current ripple and output voltage ripple.
“As Tablet display resolution increases, consumers are demanding wider backlight dynamic dimming range for the best user experience, and at the same time maintaining high efficiency with minimal LED color-shift.” said Erik Ogren, Director of Marketing at Kinetic Technologies. “The KTD3156 achieves this by the combination of both analog and PWM dimming together with handling very low duty-cycles at high efficiency.”
Various protection features are built into KTD3156, including cycle-by-cycle input current limit protection,
output over-voltage protection, LED fault (open or short) protection and thermal shutdown protection. The leakage current in shutdown mode is 0.1µA. KTD3156 is available in a RoHS and Green compliant 16-lead 3 x 3 x 0.75mm ThinQFN or 16-lead 1.65mm x 1.65mm WLCSP package.
Key Features of KTD3156
· Input voltage range: 2.7V to 5.5V
· Drive up to 60 LEDs (10S6P)
· High efficiency LED driver, up to 90%
· High frequency step-up converter (940kHz) with Integrated 40V power MOSFET
· Integrated 6-channel 30mA current sinks with 0.5% Typ. current matching and ±2% accuracy at 20mA
· Wide input PWM dimming frequency range from 100Hz to 30kHz
· Programmable Mixed-Mode Dimming controls
· Mixed analog dimming and PWM dimming with selectable transition points
· Selectable output PWM dimming frequency either fixed 22kHz or following the input PWM frequency
· Fixed 22kHz channel current phase shift
Contact Kinetic Technologies HK Ltd. or its distributors for samples and pricing.
About Kinetic Technologies:
Kinetic Technologies designs, develops and markets proprietary high-performance analog and mixed-signal power management semiconductors for consumer, computing, industrial and communication markets. The company’s product offering consists of integrated circuits that transform, regulate, deliver and monitor the power consumed by analog and digital semiconductors and other electronic loads. The company develops application-specific products to take care of the power management needs in devices such as mobile phones, smartphones, tablet computers, netbooks, GPS and MID, as well as serving a wide range of industrial, computing and communication product segments. Kinetic Technologies, a Cayman Corporation, has R&D centers in Silicon Valley and Asia, with operations and logistics based in Asia. For more information, please visit www.kinet-ic.com.
The Kinetic Technologies logo is a trademark of Kinetic Technologies. All other brand and product names appearing in this document are the property of their respective holders.