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Total power solutions target LCD TV SMPS apps

Posted: 17 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:total power device solution? LCD TV SMPS? diode technology?

Fairchild Semiconductor announced it is offering the new Stealth II and Hyperfast II diode technology as part of a total power device solution specifically designed to optimize LCD TV SMPS applications.

The new FFP08S60S and FFPF08S60S Stealth II diodes exhibit efficient soft recovery and fast reverse-recovery time. These characteristics are suitable for reducing problematic EMI and MOSFET switching losses in continuous-current-mode (CCM) power factor correction (PFC) designs.

Also being introduced is the FFPF08H60S Hyperfast II diode. Featuring fast reverse-recovery time and low forward-voltage drop, this diode helps reduce conduction losses to increase energy efficiency in discontinuous-current-mode (DCM) PFC designs.

Complementary technologies
The new Stealth II and Hyperfast II technology was developed to combine with, and complement, an array of Fairchild's existing UniFET and SuperFET MOSFET technologies.

An LCD TV's SMPS operates in two types of PFC current modes: CCM and DCM. For optimizing CCM designs, Fairchild's new FFP/PF08S60S Stealth II fast-recovery diodes can be combined with the company's previously introduced UniFET MOSFETs. For example, the 19A 500V FDA18N50 UniFET uses proprietary planar stripe DMOS technology for low Rds(on) and high unclamped inductive switching capability. Combining a new Stealth II diode with this UniFET device reduces switching loss by 10 percent compared to previous-generation devices, which results in high system efficiency. Similarly, the new FFPF08H60S Hyperfast II diode can be combined with the same UniFET device to improve efficiency and avalanche protection during DCM PFC operation.

The power challenge
Today's LCD TV SMPS must reduce power consumption while maintaining system performance and reliability in switching-mode operation. Fairchild said its SuperFET Fast Recovery MOSFET (FRFET) products are optimized to meet this design challenge. Uniting SuperFET technology with a lifetime killing process, SuperFET FRFETs offer improved body-diode characteristics, turn-off dV/dt immunity and low EMI. These advanced MOSFETs increase efficiency and reliability in even the most cutting-edge LLC half-bridge converters.

"By tailoring our new Stealth II and Hyperfast II diodes to achieve these system benefits and then combining them with existing technologies, Fairchild demonstrates its ability to draw on its proven product and design expertise to help engineers keep pace with increasing design challenges."

The new products are available in Pb-free packages that meet or exceed the requirements of the joint IPC/JEDEC standard J-STD-020C and are compliant with E.U. regulations now in effect.

Pricing for the FFPF08S60S and FFP08S60S in TO-220F is 54 cents and 48 cents for the FFPF08H60S, all in 1,000 pieces. The devices are available with 12 weeks ARO delivery time.

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