POL regulators employ ZVS
22 August 2012
Power Electronics / Power Management
Vicor recently introduced its new Picor PI33XX Cool-Power ZVS buck regulator series that affords board-level designers high power density and flexibility for high-efficiency point-of-load DC-DC regulation.
The integration of a zero-voltage switching (ZVS) topology increases point-of-load performance, providing power efficiency up to 98% peak. Products in the PI33XX series are highly integrated with control circuitry, power semiconductors and support components in a 10 x 14 x 2,56 mm LGA system-in-package (SiP).
PI33XX buck regulators can convert input supplies ranging from 8 V to 36 V to output voltages from 1 V to 16 V and output current up to 10 A for power delivery up to 120 W. Power delivery can be further increased by interleaving up to six regulators using single-wire current sharing without the need of any additional components.
The use of a ZVS topology enables high-frequency operation that maximises efficiency by minimising the significant switching losses associated with conventional buck regulators that use hard-switching topologies. The high switching frequency of the PI33XX series also reduces the size of the external filtering components, improving power density while enabling fast dynamic response to line and load transients.
The PI33XX series sustains high switching frequency all the way up to the rated input voltage without sacrificing efficiency and, with its 20 ns minimum on-time, supports large step-down conversions up to 36 VIN. A wide operating temperature range of -40°C to 125°C allows for use in almost any environment.
The regulators offer an optional I²C extended fault telemetry capability allowing for six distinct types of fault reporting. Additional device-programmable I²C features include margining, enable pin logic polarity and phase delay. Device programming is performed via the Cool-Power Development Tool.
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