These extremely compact DC-DC converters incorporate all necessary input and output filters, signaling and protection features, which are required in the majority of applications. The converters provide important advantages, such as flexible output power through total current limitation, extremely high efficiency, excellent reliability, very low ripple and RFI noise levels, full input-to-output isolation, negligible inrush current, soft start, over temperature protection, interruption time, and input over- and undervoltage lockout.
The converters are particularly suitable for rugged environments, such as railway applications. They have been designed in accordance with the European railway standards EN 50155 and EN 50121-3-2. All printed circuit boards are coated with a protective lacquer. The converter covers a total input voltage range from 12.5 to 154 VDC in the same model. The input is protected against surges and transients occurring on the source lines. The outputs are continuously open- and shortcircuit proof.
Full system flexibility and n+1 redundant operating mode are possible due to series or parallel connection capabilities of the outputs under the specified conditions. When several converters with T option are connected in parallel, a single-wire connection between these converters ensures good current sharing. LEDs at the front panel and an isolated output OK signal indicate the status of the converter. Voltage suppressor diodes and an independent overvoltage monitor protect the outputs against an internally generated overvoltage.
The converters are designed using transformers with planar technology. The input voltage is fed to a booster, which generates approximately 70 V. If Vi is higher, the booster becomes simply a diode. The resulting intermediate voltage supplies the powertrains.

There are two powertrains fitted to a converter, each consisting either of a regulated single output with synchronous rectifier or of a regulated main output with a tracking second output. The output power may be flexibly distributed among the main and the tracking output of each powertrain. Close magnetic coupling in the transformers and output inductors together with circuit symmetry ensure a small deviation between main and tracking output.
A storage capacitor charged to approx. 70 V enables the powertrains to operate during the specified interruption time.
As part of a distributed power supply system, the low-profile design significantly reduces the required volume without sacrificing high reliability. The converters are particularly suitable for 19" rack systems occupying 3 U /4 TE only, but they can also be chassis-mounted by screws or fitted with a heat sink. The connector type is H15. The fully enclosed black-coated aluminum case acts as heat sink and RFI shield, such protecting the converter together with the coating of all components against environmental impacts.

作為分布式的電源系統的一部分，低姿態的設計大大減少了所需的卷不犧牲可靠性高。轉換器是一種特別適合 19"機架系統占領 3 U 4 TE 只，但他們也可以通過螺釘安裝機箱或裝有散熱片。連接器類型是 H15。全封閉的黑色涂層鋁案例作為散熱片和 RFI 屏蔽，這種保護和涂布量對環境影響的所有組件的轉換器。

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