Saturday, September 02, 2006
Coupled inductors cut capacitor demands
Coupled inductors for nonisolated step-down DC/DC voltage regulators bring a faster transient response, lower ripple current per phase and increased system efficiency.
Pulse has introduced the industry's first family of coupled inductors for nonisolated step-down DC/DC voltage regulators. These bring a faster transient response, lower ripple current per phase and increased system efficiency. Pulse's multiphase coupled inductors are developed and manufactured under a license agreement with Volterra to support Volterra's VT1165M and VT1115M chipsets which implement its patented coupled inductor topology.
This innovative inductor solution provides a highly efficient voltage regulation system with low system cost.
Pulse's PA131xNL is a family of off-the-shelf, surface-mount, RoHS-compliant inductors, with two, three, four or five phases magnetically coupled together in a single part.
Each phase has an equivalent transient inductance (Lk) of 50nH and a magnetising inductance (Lm) greater than 250nH.
Each phase is rated for 40A and has a maximum direct current resistance (DCR) of 0.5mohm.
These parts can accommodate a 5A current imbalance between phases, ensuring they will operate well in less-than-ideal conditions.
'The Pulse PA131xNL family, when used with Volterra's chipsets, provides lower current ripple per phase, improved transient response, and higher efficiency', said Michael Arkin, Pulse Power Division Product Line Manager.
'Their lower transient inductance compared with traditional solutions reduces cost because fewer bulk capacitors are required to support high-transient-load applications such as high-performance central processing units and graphical processing units used in personal computers, workstations, and servers, DC/DC power for gaming consoles, video cards, and DDR SDRAM (double datarate synchronous DRAM) memory'.
In a noncoupled multiphase DC/DC convertor, each phase has an independent inductor.
To improve transient response, the value of this inductor must be reduced.
However, this reduction causes an increase in current ripple per phase and a decrease in efficiency.
With a coupled inductor topology, all of the inductors are integrated on the same magnetic core and the interaction of the magnetic fields from each phase enables the use of a lower equivalent inductance for faster transient response without increasing the current ripple per phase.
The reduction in ripple current in a coupled inductor topology compared with a noncoupled solution is approximately 50% for a two-phase system, 66% for three-phase, 73% for four-phase, and 77% for a five-phase system.
The Pulse PA131xNL family package dimensions and footprint match Volterra's requirements to enable second sourcing for the inductors while maintaining a low profile and small footprint.
The sizes of the inductors are: PA1312NL - 18.3 x 9.0 x 5.2mm, PA1313NL - 27.3 x 9.0 x 5.2mm, PA1314NL - 36.6 x 9.0 x 5.2mm, and PA1315NL - 42.7 x 9.0 x 5.2mm.
These products are in production with samples available for approved Volterra customers using the Volterra chipset.
The inductors are available packaged in tape and reel and in trays.
Pulse has introduced the industry's first family of coupled inductors for nonisolated step-down DC/DC voltage regulators. These bring a faster transient response, lower ripple current per phase and increased system efficiency. Pulse's multiphase coupled inductors are developed and manufactured under a license agreement with Volterra to support Volterra's VT1165M and VT1115M chipsets which implement its patented coupled inductor topology.
This innovative inductor solution provides a highly efficient voltage regulation system with low system cost.
Pulse's PA131xNL is a family of off-the-shelf, surface-mount, RoHS-compliant inductors, with two, three, four or five phases magnetically coupled together in a single part.
Each phase has an equivalent transient inductance (Lk) of 50nH and a magnetising inductance (Lm) greater than 250nH.
Each phase is rated for 40A and has a maximum direct current resistance (DCR) of 0.5mohm.
These parts can accommodate a 5A current imbalance between phases, ensuring they will operate well in less-than-ideal conditions.
'The Pulse PA131xNL family, when used with Volterra's chipsets, provides lower current ripple per phase, improved transient response, and higher efficiency', said Michael Arkin, Pulse Power Division Product Line Manager.
'Their lower transient inductance compared with traditional solutions reduces cost because fewer bulk capacitors are required to support high-transient-load applications such as high-performance central processing units and graphical processing units used in personal computers, workstations, and servers, DC/DC power for gaming consoles, video cards, and DDR SDRAM (double datarate synchronous DRAM) memory'.
In a noncoupled multiphase DC/DC convertor, each phase has an independent inductor.
To improve transient response, the value of this inductor must be reduced.
However, this reduction causes an increase in current ripple per phase and a decrease in efficiency.
With a coupled inductor topology, all of the inductors are integrated on the same magnetic core and the interaction of the magnetic fields from each phase enables the use of a lower equivalent inductance for faster transient response without increasing the current ripple per phase.
The reduction in ripple current in a coupled inductor topology compared with a noncoupled solution is approximately 50% for a two-phase system, 66% for three-phase, 73% for four-phase, and 77% for a five-phase system.
The Pulse PA131xNL family package dimensions and footprint match Volterra's requirements to enable second sourcing for the inductors while maintaining a low profile and small footprint.
The sizes of the inductors are: PA1312NL - 18.3 x 9.0 x 5.2mm, PA1313NL - 27.3 x 9.0 x 5.2mm, PA1314NL - 36.6 x 9.0 x 5.2mm, and PA1315NL - 42.7 x 9.0 x 5.2mm.
These products are in production with samples available for approved Volterra customers using the Volterra chipset.
The inductors are available packaged in tape and reel and in trays.
# posted by Swathi @ 3:24 AM 
