ON Semiconductor has released its latest GreenPoint open reference design for LCD TV power supplies. Rated at 180W, the 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 400V 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 400mW with a 50mW load. ON Semiconductor was able to leverage a proprietary variable frequency control architecture to achieve up to 60W output capability from the flyback stage while meeting the standby requirements, thus eliminating the need for a dedicated standby supply.
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 Corp. to incorporate its latest CCFL backlight inverter and JIN Current Balancer technology for CCFL.
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