Power saving ICs
31 August 2010
SENZero, a family of ICs from Power Integrations, disconnect sense resistors from high-voltage rails during standby or remote-off conditions
Power Integrations’ high-voltage ICs eliminate sense resistor power losses in standby mode
SENZero, a family of ICs from Power Integrations, disconnect sense resistors from high-voltage rails during standby or remote-off conditions. SENZero devices eliminate sense resistor power losses in standby mode and reduce total system power consumption, helping to meet the demands of energy-conscious equipment makers and efficiency standards regulators.
SENZero enables high-voltage sense resistors or resistor dividers connected to the DC high-voltage rail in Power Factor Correction (PFC) and/or power conversion stages of a power supply to be disconnected during no-load or standby conditions to reduce power consumption.
This allows functional blocks within the power supply to be shut down or disabled so that they do not draw power unnecessarily when the PSU is not in its full operation mode. When used in this manner for PC or TV power supplies, SENZero is able to shut-down the main power while keeping standby power on. The device is also suitable in other high-power applications such as laser printers, appliances, servers and networking equipment, and any other power supply where no-load performance or standby consumption is tightly regulated.
They are available in two and three-channel versions according to application requirements. For designs that require more than three disconnect channels, or for designs with layout or routing challenges, designers can use multiple SENZero ICs to meet their needs.
These devices are available now in an SOIC-8 package and product features include integrated 650V MOSFETs, high differential surge withstand, integrated gate drive and protection, and high SOURCE pin differential voltage withstand.
Edward Ong, Product Marketing Manager at Power Integrations, states: “Energy-efficiency regulators are constantly challenging power supply engineers to comply with increasingly stringent efficiency requirements, such as EuP Lots 6 and 7, and 80 PLUS. SENZero ICs – particularly when used in conjunction with Power Integrations’ recently released CAPZero X capacitor discharge ICs – allow engineers to quickly adapt existing designs to reduce power consumption in standby mode and cost-effectively bring them into compliance with new regulations.”
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