Buck-boost DC/DC converters transition without disruption, says TDK

The i7C series of 8A 300W rated non-isolated DC/DC converters have an output voltage than can be adjusted from 9.6 to 48V. They accept inputs ranging from 9.0 to 53V.

The step up, step down converters are packaged with the industry standard 1/16th pinout. According to TDK-Lambda, the converters seamlessly 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. Efficiencies are up to 97 per cent, making the compact devices suitable for use in medical, communications, industrial, test and measurement, broadcast and portable battery powered equipment.

During light load conditions, the i7C’s control circuitry reduces power consumption. At zero load, the input current draw is typically just 5mA, 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 remain functional, during periods of non-peak operation.

There are three mechanical configurations, all measuring 36.8 x 34mm. There is 12.2mm high open frame model, a 13mm high baseplate version for conduction cooling to a cold plate and models with an integral heatsink for convection or forced air cooling at 24.9mm high.

The thermal design of the i7C series allows for minimal output de-rating, even with low airflow conditions, says the company. The design reduces the need for large external components to save cost and board space.

Standard features 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. They also have a power good signal, output current monitoring and to minimise system noise, the switching frequency can be synchronised to another model or to an external clock.

All models have safety certification to the IEC/EN 62368-1 and 60950-1 standards, with CE marking to the Low Voltage and RoHS Directives.


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