TDK presents the BCEM series of EPCOS high-current chokes designed specifically for buck-boost converters in 48-V automotive power systems. These innovative SMD inductors have very compact dimensions of only 27.5 mm x 29.5 mm x 14.5 mm thanks to their ERU27 ferrite cores with flat windings. The new chokes feature inductance values of 3 µH to 11 µH and are designed for saturation currents of up to 50 A and operating temperatures of between -40 oC and +150 oC. The components are suited for switching frequencies from 100 kHz to 200 kHz, and are RoHS-compatible and qualified to AEC-Q200.
These components are used as storage chokes in buck-boost converters of vehicles linking the 12-V and 48-V levels. Six or eight-phase interleaved converters are used in order to keep the ripple currents as low as possible and transfer high power levels. Since each of the converters needs storage choke, the compact dimensions of the new high-current chokes along with their current capability are especially beneficial.