Chokes
October 17, 2023
TDK Offers SMD Coupled Inductors for Power Applications with High Efficiency
TDK Corporation (TSE:6762) has expanded its family of flat wire inductors with the high-performance EPCOS ERUC23 coupled inductor series (B82559S*). In such components, two windings share a single magnetic core. The new series comprises six types covering a coupled inductance range from 1.4 µH to 4.1 µH and saturation currents from 50 A to 97 A. The AEC-Q200-qualified and RoHS-compliant components, which can be picked and placed automatically, have dimensions of just 26.8 x 13.8 mm2, with heights varying between 13.7 mm and 14.0 mm depending on the type. They are specified for a wide temperature range from -40 °C to +150°C, and depending on the type, the DC resistance of a single winding is 0.82 mΩ to 1.85 mΩ.
Coupled inductors are very versatile: They are suitable for dual-phase buck and boost converters as well as for buck/boost converters - particularly also for hybrid voltage converters that convert 48 V to 12 V. Since the two windings are coupled, the ripple current is reduced which improves efficiency. Using coupled inductors instead of two individual chokes saves significant space on the circuit board.
Features & Applications
Main application areas
- Dual-phase buck and boost converters as well as buck/boost converters
- Hybrid converter for 48 V to 12 V (flying capacitor converters)
Main features and benefits
- High saturation currents
- Low DC resistance
- Automatic pick and place, surface mounting
- Reduced ripple with improved efficiency in a compact package
Key Data
Type | Coupled Inductance (nom.) | DC resistance of one winding | Saturation current (typ., 25 °C) | Saturation current (typ., 100 °C) |
---|---|---|---|---|
ERUC23-4R1K | 4.1 | 1.85 | 50 | 39.5 |
ERUC23-3R2K | 3.2 | 1.85 | 63.5 | 49 |
ERUC23-2R8K | 2.8 | 1.25 | 61 | 47 |
ERUC23-2R2K | 2.2 | 1.25 | 77 | 58 |
ERUC23-1R8K | 1.8 | 0.82 | 81 | 62 |
ERUC23-1R4K | 1.4 | 0.82 | 97 | 73 |
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