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AC/DC controller targets low-power computing apps

Posted: 26 Nov 2009     Print Version  Bookmark and Share

Keywords:switched-mode power supply  SMPS  controller  AC/DC 

NXP Semiconductors has launched the GreenChip TEA1733(L), a low-cost IC that increases energy efficiency and standby performance of power supplies under 75W. It is the first of a complete series of low-power AC/DC control ICs to be launched by NXP over the next year. Designed for low-power computing and communication applications such as netbook adapters, printer adapter and LCD monitor supplies, the device is a switched-mode power supply (SMPS) controller chip that enables standby power levels less than 100mW.

"With the demand for sleek, light and compact designs increasing by the day, the TEA1733 enables consumers to experience lighter and more compact netbook adapters that save money and consume less power," said Edwin Kluter, marketing director, power solutions, NXP. "The GreenChip TEA1733 enables new levels of energy efficiency in low-power applications. By reducing the number of external components needed, the TEA1733 allows OEMs to become more cost competitive while maintaining a high degree of quality and reliability."

To enable higher efficiencies at low standby mode and at all load levels, the TEA1733 requires a very low start-up current of 10µA and consumes a low supply current of 1.25mA. The combination of fixed frequency operation at high output power and frequency reduction at low output power provides high efficiency over the total load range. Due to its high level of integration, the TEA1733 enables a compact and lighter power supply design with reduced number of external components in the SMPS. The TEA1733 is available in a safe restart protection version as TEA1733 and also in a latched protection version as TEA1733(L).

The GreenChip family makes it easier and more cost-effective for power supply manufacturers to comply with energy efficiency specifications such as 80PLUS and Energy Star.

Key features of the GreenChip TEA1733 SMPS controller IC include large input voltage range of 12V-30V; low supply current during normal operation (typically 0.5mA without load); overpower or high/low line compensation; adjustable overpower time-out; and adjustable overpower restart timer. The IC also packs fixed switching frequency with frequency jitter to reduce EMI. Offering frequency reduction with fixed minimum peak current at low power operation maintains high efficiency at low output power levels. In addition, the device provides slope compensation for CCM operation; low and adjustable over-current protection (OCP) trip level; adjustable soft start; and two protection inputs; and IC over-temperature protection.

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