300W open frame DC-DC converter for 48V designs

May 28, 2020 //By Nick Flaherty
The 300W i7C non-isolated, buck-boost DC-DC converter series from TDK has an output adjustment of 9.6V to 48V
The 300W i7C non-isolated, buck-boost DC-DC converter series from TDK has an output adjustment of 9.6V to 48V

TDK has launched an 8A, 300W rated non-isolated DC-DC converter range in an open frame package with the industry standard 1/16th pinout for 48V designs.

The output voltage of the i7C DC-DC step-up and step-down converter series can be adjusted from 9.6 to 48V and accept a wide range input voltage of 9 to 53V. The converters transition from buck to boost mode operation without disruption in performance.

The i7C 8A series can be used to derive additional high-power outputs from a 12V, 24V, 36V or 48V DC power supply, at a much lower cost than isolated DC-DC converters. With efficiencies of up to 97 per cent, the open frame DC-DC converter series can be used in medical, communications, industrial, test and measurement, broadcast and portable battery powered equipment.

During light load conditions, the i7C’s control circuitry significantly reduces power consumption. At zero load, the input current draw is 5mA typical, which can be reduced to around 0.25mA when the remote on-off is used to put the converter into standby. This extends the time battery powered equipment can be used in periods of non-peak operation.

There are three mechanical configurations for the open frame DC-DC converter series, which measures 36.8mm x 34mm, with a 12.2mm profile. A baseplate version for conduction cooling to a cold plate is 13mm high, or models with an integral heatsink for convection or forced air cooling are 24.9mm high.

The thermal design of the i7C series allows for minimal output de-rating, even with low airflow conditions. The product’s design reduces the need for large external components, saving cost and board space.

Standard features for the i7C series include a trim pin for output voltage adjustment, + remote sense, remote on-off (positive or negative logic), input under-voltage, over-current and over-temperature protection. As an option, the full-featured models are equipped with a power good signal, output current monitoring and to minimise system noise, the switching frequency can be synchronised to another model


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