| AAI Announces the IPS102 Critical Conduction Mode Power Factor Controller for Lower Power Apps |
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New Critical Conduction Mode Power Factor Controller from ASIC Advantage for High Efficiency, High Power Factor, Lower Power Applications Sunnyvale, CA, February 27, 2008 - ASIC Advantage, Inc. announces the introduction of a new Controller in the Power Management family, targeted for creation of Power Factor Corrected supplies in applications running up to 200W. Unlike the prior PFC Controller from ASIC Advantage, the IPS101, the IPS102 is designed for critical conduction operation, typically found in lower power systems. Such systems are implemented with smaller, lower power magnetic components, in turn reducing costs and increasing transient response capability in these supplies. Such ICs are being driven by the requirements that equipment sold into the European Market of 75W in power consumption and higher must comply with line harmonic, or power factor, requirements, (IEC Standard 71000-3-2). Such standards apply in Europe, as well as Japan and China. These requirements for volume markets are commonly seen in personal computers, lighting and other industrial power systems, such as motor drives, etc. With proper attention design details, the IPS102 can be used to design PFC supplies operating at greater than 95% Power Factor and efficiency. Features include an asymmetric output drive stage allowing for faster turn off than turn on, with 20 Ohms pull down drive buffer resistance versus a pull-up resistance of 30 Ohms. The topology of this Critical Conduction Mode PFC is implemented using an internal multiplier circuit that controls the gating of the principal switching MOSFET, setting a peak allowable monitored switch current for the maximum on time in any switching event and a turn-off set to correspond to zero-inductor current. The levels of peak and minimum inductor current are set through current analog inputs to an internal circuit multiplier that sets the peak level in proportion to the line voltage in combination with the monitoring of the output supply bus voltage. This mode of operation is essentially a self-oscillating topology, varying as in frequency and current for regulation of the output bus voltage based on input line and output load requirements. The goal is to force the input switched current waveform to track the variation of the input line voltage, allowing for high power factor. Allowing the inductor current to drop to zero is the distinguishing characteristic of a critical conduction style of PFC supplies Provision is made for connection of components for voltage mode compensation, as well as an internally generated 2.06V reference voltage. The reference is derived from the internal 10V shunt regulator, in turn connected to the control voltage input for start-up and input of an external control voltage. The IPS102 starts operation at about the 10V level, and shuts-off the IC with an under-voltage protection feature. Start-up power can be provided through an external resistor to the input line voltage or a current regulator, with steady state operating power best derived from an auxiliary inductor winding of the supply magnetic element for normal operation. Note that start-up and operating current, excluding drive current, of the IPS102 is very low, typically 100µA for start-up and 650µA for operation respectively. Additional protection features are included with the IPS102. The first is cycle-by-cycle current limiting, integrated by virtue of the cycle-by-cycle programmed limits on operating current from the power factor multiplier circuit. Additionally, a thermal shutdown feature is included, shutting off when the junction temperature exceeds 150ºC, resuming operation when the temperature drops to approximately 120ºC. The IPS102 is offered in RoHS compliant 8-Pin PDIP or 8-Pin SOIC package options. Pricing in 1k quantities is $0.50 or $0.49, with lower pricing available for high volume production. An evaluation board, IPS-DK102, for evaluation of the IPS102 is available for $99. For samples or the evaluation board, please contact your local representative where available, or in the absence of such contact the factory at This e-mail address is being protected from spam bots, you need JavaScript enabled to view it . The IPS102 is one of an extensive, feature varied list of Controllers and Feedback and Support Power Management ICs available from ASIC Advantage. We recommend you consult the factory or your local representative for a copy of ASIC Advantage's new 2007-2008 Mixed-Signal IC Short Form for the most comprehensive list of Controllers and other complimentary products available from ASIC Advantage, as well as information regarding new offerings coming through 2008. Discover more regarding ASIC Advantage standard products and custom design capabilities by visiting us on the web at http://www.asicadvantage.com. Any statements contained in this press release that are not statements of historical fact, including the performance, ruggedness and suitability of products for specific applications, may be deemed as forward looking statements. Various factors could cause the results to be different than stated or implied by these forward looking statements. As ASIC Advantage is a privately owned company, ASIC Advantage, Incorporated has no obligation to publicly communicate the results of any revisions to these forward looking statements. About ASIC Advantage, Inc. © ASIC Advantage, 2007, All Rights Reserved. ASIC Advantage®, ASIC Advantage, Inc. ®, In-Plug®, Striking the Balance!, logo and combinations thereof are registered trademarks of ASIC Advantage, Inc. |
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