300W DC-DC converter adds adjustable current limit option for parallel operation  

300W DC-DC converter adds adjustable current limit option for parallel operation  

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By Nick Flaherty

TDK has added adjustable current limit models to its 300W buck-boost DC-DC converter range.

The TDK-Lambda i7C non-isolated DC-DC converter series is a buck-boost board mount power module with input ranges of 9 up to 53Vdc with output voltage adjustment from 5 to 28V, 8 to 24V or 9.6 to 48V depending upon the output current rating.

The i7C topology enables a seamless transition from buck (voltage reduction) to boost (voltage increase) operation. The “Itrim” output current limit function enables parallel operation of modules for higher power requirements, operation in constant current, or reducing device stress where overloading may occur due to charging large capacitive loads.

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 The i7c models are suitable for generating additional high-power DC outputs from 12, 24, and 48V system voltages in medical, automated guided vehicles (AGV), Industrial Mobile Robots (IMR), drones, industrial, test, measurement, and battery-powered equipment.

The high efficiencies of up to 97% reduce waste heat, allowing the DC-DC converter module to operate and deliver high useable power in demanding thermal environments. Under light load conditions, the i7C’s control techniques significantly reduce power consumption.

Under zero load conditions, the typical input current for these modules is 5mA. When the module is inhibited, this current can be further reduced to approximately 0.25mA. The low quiescent current allows battery-powered equipment to remain functional longer during periods of non-operation.

These additional models include output voltage adjustment, negative logic remote on-off, output current monitoring, positive remote sense, plus input under-voltage, over-current and thermal protection. A sync function enabling a common operating switching frequency between multiple converters to reduce system noise is also included.

Three mechanical configurations are available for the DC-DC converter series; low profile open frame measuring 34 x 36.8 x 14.7mm (LxWxH), baseplate construction for conduction cooling (15.5mm in height), or integral heat sink for convection or forced air cooling (24.9mm in height). The i7C converters have the industry standard 1/16th brick pin-out.



i7C -Px3-R suffix

Input voltage range


9 to 36V or 9 to 53V

Output voltages


5 to 28V, 8 to 24V or 9.6 to 48V

Maximum output power





Up to 97




Size (W x L x H)


34 x 36.8 x 14.7 (open frame model 20A model)

Safety certification


IEC / EN / UL / CSA /EN 62368-1

All the DC-DC converter models are certified to IEC/UL/CSA/EN 62368-1 and carry the CE and UKCA marks for the Low Voltage and RoHS Directives.

Details are at the i7C Series Datasheet (


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