Kinetic Expands Its Power Solution with High Efficiency LED Driver KTD3156 Featuring PWM-controlled, Mixed-mode Dimming

PublishTime： 2023-12-11 Article Source：Kinetic Technologies News

Kinetic Technologies, a high-performance analog and mixed-signal semiconductor company focused on developing power management solutions for computing, consumer, industrial, and communications markets, 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, and 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 Technologies۪ 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 a 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 mode۪s output PWM dimming frequency can be programmed to fixed 22kHz or following input PWM dimming frequency. For fixed 22kHz output PWM dimming, a 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 0.1A. 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 ranges 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

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