ON Semiconductor unveiled its GreenPoint reference design for 220W LCD-TV power supplies. This flat-screen television design delivers standby power of less than 1 W, addresses all functional blocks of the power supply and meets international regulations for low standby power dissipation. The enabling devices for the reference design are the NCP1395 and NCP5181.

NCP1395 is a resonant mode controller that offers everything needed to build a reliable and rugged power supply. Its unique architecture includes a 1.0 MHz Voltage Controller Oscillator and protections featuring various reaction times that contribute to a safer converter design, without engendering additional circuitry complexity. This device is offered in an SOIC-16 package, priced at $1.38 per unit in 2,500 unit quantities, and a PDIP-16 package, priced at $1.50 per unit in 500 unit quantities.

NCP5181 is a high voltage power MOSFET driver that provides two outputs to drive two N-channel MOSFETs. The NCP5181 uses the "bootstrap" technique to ensure proper drive of the high-side power switch. This device is offered in an SOIC-8 package, priced at $1.60 per unit in 2,500 unit quantities, and a PDIP-8 package, priced at $1.74 per unit in 1,000 unit quantities.

Other key devices

NCP1653 - a Power Factor Correction (PFC) controller that is ideal for continuous conduction mode (CCM) PFC applications like those found in flat-screens televisions. This device makes the choice of incorporating a PFC front-end into a power supply design easy by reducing part count and providing a robust, cost-effective front-end without range switches. This device is offered in an SOIC-8 package, priced at $0.80 per unit in 2,500 unit quantities, and a PDIP-8 package, priced at $0.88 per unit in 1,000 unit quantities.

NCP1027 - a highly integrated Switch Mode Power Supply (SMPS) switcher. This device provides improved efficiency at light loads by entering a skip cycle when power demand is low. This device is offered in a PDIP-8 package, priced at $0.95 per unit in 1,000 unit quantities.

Supporting devices

TL431 - a programmable precision reference. MBR10H100CT - 100 V, 10 A, H-series SWITCHMODE power rectifier. MBRS260 - 60 V, 2 A, schottky power rectifier. MMSZ7V5E - 225 W, 7.5 V, energy rated zener.

A complete documentation package for the LCD-TV power supply is available -- including description, schematic, bill-of-materials, Gerber images and evaluation results.