ON Semiconductor (Nasdaq: ONNN), a leading global supplier of high-performance, energy-efficient, silicon solutions, released its latest GreenPoint[tm] open reference design for LCD TV power supplies. This 180 watt (W) High Voltage LCD Integrated Power Supply (HV-LIPS) combines the main system power with the backlight inverter. By implementing an architecture where the inverter is directly powered from the 400 volt (V) PFC rail, the reference design eliminates a complete power conversion stage, improving overall system efficiency, simplifying the design and reducing the bill of materials. The design supports the need for higher efficiency power supplies to meet the active and standby power requirement of the ENERGY STAR 3.0 TV standard that went into place in November 2008.
ON Semiconductor’s reference design for LCD TV power supplies meets IEC 61000-3-2 harmonic content requirements, and exceeds global standby requirements with typical standby power consumption of 400 milliwatts (mW) with a 50 mW load. ON Semiconductor was able to leverage a proprietary variable frequency control architecture to achieve up to 60 W output capability from the flyback stage while meeting the standby requirements, thus eliminating the need for a dedicated standby supply.
“Our customers have expressed interest in the design, as HV-LIPS power supplies are starting to enter the mainstream market for 32 inch and larger LCD TVs,” said Bill Schromm, senior vice president and general manager of ON Semiconductor’s Computing and Consumer Group. “The reference design merges the power supply with the inverter onto a single PCB with a maximum height of 25 mm, to meet the tight form factor constraints of LCD TVs.”
The HV-LIPS LCD TV Reference Design
The reference design addresses all functional blocks of the HV-LIPS LCD TV power supply, including power factor correction; control, signal, and audio power; high-voltage backlight inverter; and CCFL drive and current balancing. The design utilizes several of ON Semiconductor’s newest power management devices and draws from its leading discrete component portfolio to achieve superior power efficiency performance. The design was completed in conjunction with Microsemi Corporation (NASDAQ: MSCC) to incorporate its latest CCFL backlight inverter and JIN Current Balancer technology for CCFL.
“Microsemi and ON Semiconductor have collaborated to provide customers with an optimized, turnkey LCD TV backlight solution that brings outstanding performance and functionality to eco-friendly LCD TVs,” said Tom Kapucija, director of marketing in the Analog Mixed Signal Group of Microsemi. “The LX6503 delivers synchronization and lamp current accuracy while supporting a broader range of signal frequencies and sources than alternative solutions for mainstream HV-LIPS applications. This gives HV/LIPS display users a superior visual experience whether they are watching TV broadcasts or playing DVD or Blu-Ray content. The integration of the LX6503 CCFL inverter controller into ON Semiconductor’s GreenPoint 400V HV-LIPS reference design creates a complete solution for our customers.”
ON Semiconductor has a complete documentation package for the HV-LIPS LCD TV reference design, including description, schematics, bill-of-materials, Gerber files, and evaluation guidelines. The documentation package is available at www.onsemi.com/powersupplies, as are links to relevant industry information and other supporting information. The documentation package is also available by contacting a local Microsemi representative at www.microsemi.com/contact/contactfind.asp.
Key products in the reference design include:
From ON Semiconductor
NCP1606 Critical Conduction Mode Power Factor Controller. The NCP1606 is an active power factor controller specifically designed for use as a pre-converter in medium power off line power supplies. It embeds a Critical Conduction Mode power factor control scheme that exhibits near-unity power factor across a wide range of input voltages and power levels. The NCP1606 is priced at $0.30 per unit in 2,500-unit quantities, in SOIC-8 packages; and at $0.36 per unit in 50-unit quantities, in PDIP-8 packages.
NCP1351 Variable Off-Time Controller. The NCP1351 is a current mode controller targeting low power off line flyback Switched Mode Power Supplies. Based on a fixed peak current technique (quasi fixed TON), the controller decreases its switching frequency as the load becomes lighter. As a result, a power supply using the NCP1351 naturally offers excellent no load power consumption, while optimizing the efficiency in other loading conditions. The NCP1351 is priced at $0.32 per unit in 2,500-unit quantities, in SOIC-8 packages; and at $0.36 per unit in 50-unit quantities, in PDIP-8 packages.
MUR550PF 5 A, 520 V Ultrafast Rectifier. The low forward voltage drop of the MUR550PF reduces forward conduction losses in DCM PFC applications. The MUR550PF is priced at $0.16 per unit, in 50-unit quantities for TO-220 packages, 1,500-unit quantities for axial lead packages, and 2,500-unit quantities for DPAK packages.
MBR20100CT 20 A, 100 V Schottky Rectifier. The MBR20100CT is priced at $0.55 per unit in 50-unit quantities, in TO-220 packages.
NTGD4167C Complementary, +2.9/-2.2 A, 30 V Power MOSFET. The NTGD4167C is priced at $0.16 per unit in 3,000-unit quantities, in TSOP-6 packages.
NTA4153N N-Channel, 915 mA, 20 V MOSFET with ESD Protection. The NTA1453N is priced at $0.07 per unit in 3,000-unit quantities, in SC-75 packages.
NTD14N03 N-Channel, 14 A, 25 V Power MOSFET. The NTD14N03 is priced at $0.09 per unit in 2,500-unit quantities, in DPAK packages.
NTD3055-094 N-Channel, 12 A, 60 V Power MOSFET. The NTD3055-094 is priced at $0.19 per unit in 75-unit quantities, in DPAK packages.
All of these devices are RoHS compliant and are delivered in Pb-free packages.
LX6503 CCFL Inverter Controller with SYNC technology. The LX®6503 provides the key functions needed for LCD TV / Monitor displays in a simplified controller while providing reliable lamp striking, comprehensive brightness control modes and support for 24V inverter topologies in existing backlight applications. The SYNC capability significantly improves display quality by synchronizing both the frequency and phase of the lamp current between inverters or to external signals from a wide variety of sources including DVD and Blu-Ray devices. The LX®6503 controller also features tighter lamp current accuracy as compared to competitive solutions. A wide range of supply operation from 6 V to 27 V is complemented with 600 mA source/sink drive and an on chip regulator with UVLO protection. Reliable operation is supported via programmable Strike Time, Strike Frequency, Burst Dimming Frequency, and Fault Time as well as multiple fault detection capabilities such as open lamp, over voltage, short circuit, and over current protection.
GreenPoint[tm] reference designs enable more efficient systems by establishing the feasibility of meeting evolving energy efficiency standards with existing technology, and by setting performance benchmarks. ON Semiconductor’s GreenPoint reference designs are available for ATX, DTA, STB, CRT TV, and LCD TV power supplies; and 5 W, 16 W, 40 W, 60 W, 90 W, and 200 W power adapters. To acquire documentation packages, visit www.onsemi.com/greenpoint.
About ENERGY STAR®
ENERGY STAR® is a joint program of the U.S. Environmental Protection Agency and the U.S. Department of Energy helping us all save money and protect the environment through energy-efficient products and practices.
About Microsemi Corporation
Microsemi, with corporate headquarters in Irvine, California, is a leading designer, manufacturer and marketer of high-performance analog and mixed signal integrated circuits and high-reliability semiconductors. The Company’s semiconductors manage and control or regulate power, protect against transient voltage spikes and transmit, receive, and amplify signals. Microsemi’s products include individual components as well as integrated circuit solutions that enhance customer designs by improving performance and reliability, optimizing battery performance, reducing size or protecting circuits. The principal markets the company serves include defense, commercial air, satellite, medical, notebook computers, LCD TVs, mobile, and connectivity applications.
About ON Semiconductor
With its global logistics network and strong product portfolio, ON Semiconductor (NASDAQ: ONNN) is a preferred supplier of high-performance, energy-efficient, silicon solutions to customers in the power supply, automotive, communication, computer, consumer, medical, industrial, mobile phone, and military/aerospace markets. The company’s broad portfolio includes power, analog, DSP, mixed-signal, advance logic, clock management, non-volatile memory and standard component devices. Global corporate headquarters are located in Phoenix, Arizona. The company operates a network of manufacturing facilities, sales offices and design centers in key markets throughout North America, Europe, and the Asia Pacific regions.
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