（PowerIntegrations company launched a highly integrated and has the advantages of high accuracy of the primary side control of LinkSwitch-II series AC-DC switch power converter IC, can greatly simplify the constant voltage / constant current (CV/CC) converter design, make consumer products easily meet all the global energy efficiency and no-load standards (such as external power energy star 2 standard). The new IC is very suitable for mobile phone, cordless phone charger, high brightness LED driver and the application of other precise constant pressure or constant current output.）
　　（This product is a series of LinkSwitch IC PowerIntegrations has successfully launched a new generation of products, the use of it can save the optocoupler, all secondary side of the CV/CC control circuit and all control loop compensation circuit design of precise output CV/CC converter, thus greatly simplifying the design. Through all control and protection circuit and a 700MOSFET integrated into the 8 pin package, LinkSwitch-II not only can significantly reduce the number of components, space and the system cost, but also can improve the reliability of power. The integration of more accurate compensation function, can on the transformer inductance tolerance, variation of the input voltage, output cable voltage drop (LNK61x only) to compensate the temperature drift of output and peripheral components, CV/CC +/-5% and +/-10% tolerance respectively realize temperature range in 0 – 100 ° C. In addition, LinkSwitch-II has a frequency jitter function but also can greatly reduce the cost of EMI filter. Its advanced safety features include automatic restart output short circuit protection and thermal shutdown with hysteresis. The new IC also meet between IEC 60950-1 HV on the drain pin and all other pins creepage requirements, and all the single point of failure handling safety.）
　　（In the use of LinkSwitch-II design 5V/1A, 5 W mobile phone charger design paradigm, point load test on the 115VAC to 230VAC input range under 25%, 50%, 75% and 100% showed that the average power, efficiency can reach 75%, fully meet the energy star 2 for external power requirements. LinkSwitch-II is integrated with on / off control circuit, coupled with its IC low power consumption, no secondary side current sense resistor and the control circuit, the power supply has a constant efficiency over the entire load range, and the no-load power consumption less than 30mW. LinkSwitch-II for switching power supply design to achieve the integration level set a new benchmark. Because it uses the primary side control to precisely control the output current and voltage, eliminating an optocoupler expensive and all secondary feedback and compensation element. Compared with the previous generation LinkSwitch, use the LinkSwitch-II charger designed to use less 9 elements, while compared with discrete design, is to use less 15 elements. Because LinkSwitch-II has the cable voltage drop compensation function accurately, thus can reduce the output cable with copper content to reduce the output cable costs substantially, but this does not affect the output performance. In addition, the transformer LinkSwitch-II also requires the use of smaller, so you can save the copper and core material.）
　　（Because without the use of a secondary feedback detecting element, which makes the efficiency of using LinkSwitch-II charger to nearly 80% level. Moreover, LinkSwitch-II can significantly reduce the no-load power consumption, when the charger is disconnected with the equipment, the no-load power consumption will be reduced to the difficulty in measuring level, thus saving a lot of electricity for consumers. To make a long story short, the LinkSwitch-II solution can not only greatly simplifies the design of power supply, reduce manufacturing cost, but also can save a lot of resources and energy.）
　　（LinkSwitch-II needs to be emphasised in the green environmental protection, the series of all devices for halogen free product, and provide the RoHS package, such as Apple, Nokia, the final customer Samsung and LG etc. this requirement is becoming more and more high.）