Power Integrations (News - Alert), a developer of high-voltage analog integrated circuits for energy efficient power conversion, has introduced its LinkSwitch-II family of highly integrated AC-DC switched-mode power conversion ICs with primary-side control.
LinkSwitch-II simplifies constant-voltage, constant-current (CV/CC) converters, and enables consumer products to meet all worldwide energy-efficiency and no-load regulations, such as ENERGY STAR (News - Alert) 2.0 for external power supplies. The new ICs are perfect for applications such as chargers for cell phones and cordless phones, high brightness LED drivers and other accurate CV or CC applications.
LinkSwitch-II makes things easier for the design of accurate output CV/CC converters by eliminating the need for optocouplers and all secondary-side CV/CC control circuitry as well as all control-loop compensation circuitry. By integrating all control and protection circuitry plus a 700 V MOSFET in an 8-pin package, LinkSwitch-II reduces component count, space and system cost while increasing reliability.
Output CV/CC tolerances of +/-5% and +/-10% respectively are also accomplished over a 0 - 100 degrees C temperature range by incorporating precision-enhancing features that compensate for transformer inductance tolerances, input line variations, output cable voltage drop (LNK61x only) and external component temperature variations.
LinkSwitch-II also offers frequency
jittering to significantly reduce EMI filter costs. Sophisticated protection and safety features include auto-restart output short circuit protection and hysteretic thermal shutdown. IEC (News - Alert) 60950-1 HV creepage requirements between Drain and all other pins are met and all single point failures are handled safely.
LinkSwitch-II offers a simple path to ENERGY STAR EPS 2.0 compliance by achieving average efficiency levels of up to 75 percent at 25 percent, 50 percent, 75 percent and 100 percent loads across a 115 to 230 VAC input range. The On/Off control scheme employed in LinkSwitch-II, coupled with low IC power consumption and elimination of secondary-side current sense resistor and control circuitry, provides practically constant efficiency across the entire load range and a no-load consumption of under 30 mW.
"LinkSwitch-II sets a new standard in the level of integration achievable in a switching power supply design. It uses primary side regulation to accurately control the output current and voltage, eliminating an expensive opto-coupler and all of the secondary feedback and compensation components,” said Doug Bailey, vice president of marketing at Power Integrations. “LinkSwitch-II offers accurate cable drop compensation which significantly reduces the cost of the output cable by minimizing its copper content, without sacrificing output performance. It also requires a smaller transformer using less copper and core material."
Niladri Sekhar Nath is a contributing writer for TMCnet covering telecommunications, service providers and networking. To see more of his articles, please visit his columnist page.
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