TOP254YN

TOPSwitch-HX is a highly integrated monolithic off-line switcher IC designed for off-line power supplies. TOPSwitch-HX integrated circuits enable design of power supplies up to 195 W, while providing high efficiency under all load conditions. TOPSwitch-HX also provides very good performance at low load and during standby (no load) operation. The TOPSwitch-HX Family allows the designer to meet the efficiency requirements for the new energy-efficiency standards. Innovative and proprietary features enable design of compact and cost effective switching power supplies while reducing overall design cycle time and system cost. The TOPSwitch-HX Family also enables the design of power supplies with robust functionality and provides enhanced safety features such as output overvoltage protection, overload power limiting and hysteretic thermal protection.

Lower System Cost, Higher Design Flexibility

• Multi-mode operation maximizes efficiency at all loads
• New eSIP-7C and eSIP-7F packages build on PI’s experience with high power and high reliability packages
• No heatsink required up to 35 W (up to 48 W at 230 VAC) using P, G or M packages
• Output overvoltage protection (OVP) is user programmable for latching/non-latching shutdown with fast AC reset
• Line undervoltage (UV) detection prevents turn-off glitches
• Line overvoltage (OV) shutdown extends line surge limit
• Accurate programmable current limit
• Optimized line feed-forward for line ripple rejection
• 132 kHz frequency (254Y-258Y and all E packages) reduces transformer and power supply size (half frequency option for video applications)
• Tight I²f parameter tolerance reduces system cost
• Frequency jittering reduces EMI filter cost
• Heatsink is connected to SOURCE for low EMI
• Improved auto-restart delivers <3% of maximum power in short circuit and open loop fault conditions
• Accurate hysteretic thermal shutdown function automatically recovers without requiring a reset
• Fully integrated soft-start for minimum start-up stress
• Extended creepage between DRAIN and all other pins improves field reliability

EcoSmart – Energy Efficient

• Energy efficient over entire load range
• No-load consumption
• Less than 200 mW at 230 VAC
• Standby power for 1 W input
• >600 mW output at 110 VAC input
• >500 mW output at 265 VAC input

eSIP (E) Package (eSIP Package Information)

• Low junction-to-case thermal impedance (2 °C per watt)
• Low height is ideal for adapters where space is limited
• Simple clip-mounted heatsink reduces manufacturing cost

Applications:

• LCD monitors
• Personal computers
• Small servers
• Laptop adapters
• Set-top boxes
• Digital TVs
• Printers
• DVD Players and Recorders
• UPS
• Video Games
• Broadband Modems
• Cellular phone adapters
• Audio Amplifiers