TDK T1 D S D 48V S T2 12V
Figure 1. Circuit diagram of a buck-boost converter. Apart from the switching transistors, EPCOS power inductors and storage capacitors are the key components.
A
B
Figure 2. The compact EPCOS power inductors for buck-boost converters are available with current capabilities of up to 75A.
Figure 3. EPCOS aluminium electrolytic capacitors for automotive electronics are characterised by their extremely high vibration strength of up to 60g and maximum operating temperatures of up to 150°C.
(Figure 2, above). This series offers a rated inductance of 3.2µH to 10µH and – depending on type – they are even designed for a saturation current of 79A at an ohmic resistance of 0.85mΩ. The dimensions of these power chokes are 33mm x 33mm x 15mm. All the above types are suitable for operating temperatures ranging from -40°C to +150°C. They are also RoHS-compatible and qualified to AEC-Q200. In addition to the standard ERU 27 and ERU 33 types, customer-specific types with other inductance values can also be offered.
Extremely vibration-resistant capacitors with high ripple current capability
Apart from the inductors, the key components in buck-boost converters are robust aluminium electrolytic capacitors for storage and smoothing. The EPCOS B41689 and B41789 series (Figure 3, above) are specially designed for the stringent demands of automotive electronics. They are characterised by their extremely high vibration strength of up to 60g.
The soldering star design and the version with cathode plate contacts on both ends of the capacitor enable optimised mounting with low ESL values.
Thanks to their multiple internal contacts, these capacitors also feature low ESR values, which results in a higher ripple current capability and lower losses. Depending on type, the continuous ripple current capability of these capacitors at a case temperature of 125°C reaches values of up to 29.5A. The automotive series are designed for rated voltages of 25V, 40V (for 12V) and 63V (for 48V). With these voltages they can be used in the new on-board power systems at both voltage levels. The capacitance range extends from 360µF to 4500µF.
For more information visit:
avnet-abacus.eu/tdk-automotive
21
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36
