PowerIntegrations has announced the introduction of the LinkSwitch-II family of AC-DC switching power conversion ICs with high integration and high precision primary side control. LinkSwitch-II devices greatly simplify the constant voltage/constant current (CV/CC) design, making it easy for consumers to meet all energy efficiency and no-load standards worldwide (eg, for external ENERGY STAR 2.0 standards). The new IC is ideal for cordless phones, high-brightness drives, and other applications that require precise constant voltage or constant current output.
LinkSwitch-II is a new generation of LinkSwitch family ICs successfully launched by PowerIntegrations. It can eliminate optocouplers, all secondary side CV/CC controls and all control loop compensation circuits when designing accurate output CV/CC converters. , which greatly simplifies the design. By integrating all control and protection circuitry and a 700V MOSFET into an 8-pin package, LinkSwitch-II not only dramatically reduces component count, space and system cost, but also increases power supply reliability. Thanks to the integration of more accurate compensation functions, it is possible to compensate for tolerances, input voltage variations, output voltage drop (LNK61x only) and temperature drift of peripheral components, so that +/ can be achieved in the temperature range of 0-100 °C respectively. -5% and +/-10% output CV/CC tolerance. In addition, LinkSwitch-II's frequency jittering feature also greatly reduces the cost of EMI filters. Its advanced safety features include automatic restart output short circuit protection and hysteretic thermal shutdown. The new IC also meets the creepage requirements of the IEC60950-1 HV for the drain pin and all other pins and safely handles all single points of failure.
In the 5V/1A, 5 W design example using LinkSwitch-II design, tests for 25%, 50%, 75%, and 100% load points at 115VAC to 230VAC input range indicate that the average power efficiency is 75%. Fully meet the ENERGY STAR 2.0 requirements for external power supplies. The LinkSwitch-II integrates an on/off control circuit, coupled with low IC power consumption and no need for secondary side current sensing and control circuitry, resulting in constant power dissipation over the entire load range and low no-load power consumption. At 30mW.
Doug Bailey, vice president of marketing at Power Integrations, said: "LinkSwitch-II sets a new benchmark for the level of integration that can be achieved in the design. Because it uses primary side regulation to precisely control the output current and voltage, it eliminates expensive optocouplers and All secondary feedback and compensation components. Compared to the previous generation of LinkSwitch, the charger designed with LinkSwitch-II uses 9 fewer components, while the discrete design uses 15 fewer components. Thanks to LinkSwitch- II has accurate cable drop compensation, which can significantly reduce the output cable cost by reducing the copper content of the output cable, which does not affect the output performance. In addition, LinkSwitch-II also requires a smaller transformer, so Can save copper wire and core."
Bailey went on to say: "Because there is no need to use secondary feedback detection components, this makes the LinkSwitch-II charger nearly 80% efficient. Moreover, LinkSwitch-II can also significantly reduce no-load power consumption when the charger is When the device is disconnected, its no-load power consumption will be reduced to a level that is difficult to measure, saving consumers a lot of electricity. In short, the LinkSwitch-II solution not only greatly simplifies power supply design, reduces manufacturing costs, but also saves A lot of resources and energy."
LinkSwitch-II needs to be further emphasized in terms of environmental protection. All devices in the series are halogen-free and offer RoHS-compliant packaging. End customers such as Apple, Nokia, Samsung and LG are becoming more and more demanding. .
LinkSwitch-II is a new generation of LinkSwitch family ICs successfully launched by PowerIntegrations. It can eliminate optocouplers, all secondary side CV/CC controls and all control loop compensation circuits when designing accurate output CV/CC converters. , which greatly simplifies the design. By integrating all control and protection circuitry and a 700V MOSFET into an 8-pin package, LinkSwitch-II not only dramatically reduces component count, space and system cost, but also increases power supply reliability. Thanks to the integration of more accurate compensation functions, it is possible to compensate for tolerances, input voltage variations, output voltage drop (LNK61x only) and temperature drift of peripheral components, so that +/ can be achieved in the temperature range of 0-100 °C respectively. -5% and +/-10% output CV/CC tolerance. In addition, LinkSwitch-II's frequency jittering feature also greatly reduces the cost of EMI filters. Its advanced safety features include automatic restart output short circuit protection and hysteretic thermal shutdown. The new IC also meets the creepage requirements of the IEC60950-1 HV for the drain pin and all other pins and safely handles all single points of failure.
In the 5V/1A, 5 W design example using LinkSwitch-II design, tests for 25%, 50%, 75%, and 100% load points at 115VAC to 230VAC input range indicate that the average power efficiency is 75%. Fully meet the ENERGY STAR 2.0 requirements for external power supplies. The LinkSwitch-II integrates an on/off control circuit, coupled with low IC power consumption and no need for secondary side current sensing and control circuitry, resulting in constant power dissipation over the entire load range and low no-load power consumption. At 30mW.
Doug Bailey, vice president of marketing at Power Integrations, said: "LinkSwitch-II sets a new benchmark for the level of integration that can be achieved in the design. Because it uses primary side regulation to precisely control the output current and voltage, it eliminates expensive optocouplers and All secondary feedback and compensation components. Compared to the previous generation of LinkSwitch, the charger designed with LinkSwitch-II uses 9 fewer components, while the discrete design uses 15 fewer components. Thanks to LinkSwitch- II has accurate cable drop compensation, which can significantly reduce the output cable cost by reducing the copper content of the output cable, which does not affect the output performance. In addition, LinkSwitch-II also requires a smaller transformer, so Can save copper wire and core."
Bailey went on to say: "Because there is no need to use secondary feedback detection components, this makes the LinkSwitch-II charger nearly 80% efficient. Moreover, LinkSwitch-II can also significantly reduce no-load power consumption when the charger is When the device is disconnected, its no-load power consumption will be reduced to a level that is difficult to measure, saving consumers a lot of electricity. In short, the LinkSwitch-II solution not only greatly simplifies power supply design, reduces manufacturing costs, but also saves A lot of resources and energy."
LinkSwitch-II needs to be further emphasized in terms of environmental protection. All devices in the series are halogen-free and offer RoHS-compliant packaging. End customers such as Apple, Nokia, Samsung and LG are becoming more and more demanding. .
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