Off Line Switcher 7-Pin SOIC-C

LinkSwitch-LP switcher ICs cost effectively replace all unregulated isolated linear transformer based (50/60 Hz) power supplies up to 3 W output power. For worldwide operation, a single universal input design replaces multiple linear transformer based designs. The self-biased circuit achieves an extremely low no-load consumption of under 150 mW. The internal oscillator frequency is jittered to signifi cantly reduce both quasi-peak and average EMI, minimizing filter cost. LinkSwitch-LP comprises a 700 V power MOSFET switch with a power supply controller on the same die. Unlike conventional PWM (pulse width modulation) controllers, it uses a simple ON/OFF control to regulate the output voltage. The controller consists of an oscillator, feedback (sense and logic) circuit, 5.8 V regulator, BYPASS pin undervoltage circuit, over-temperature protection, frequency jittering, current limit circuit, and leading edge blanking.

• Output Power - Adapter : 2.5 W
• Output Power - Open Frame : 2.5 W
• Lowest component count switcher
• Very tight parameter tolerances using proprietary IC trimming technology and transformer construction techniques enable Clampless™designs – decreases component count/system cost and increases efficiency
• Meets industry standard requirements for thermal overload protection – eliminates the thermal fuse used with linear transformers or additional components in RCC designs
• Frequency jittering greatly reduces EMI – enables low cost input fi lter configuration
• Meets HV creepage requirements between DRAIN and all other pins, both on the PCB and at the package
• Proprietary E-Shield™ transformer eliminates Y-capacitor