Active filter protects DC-DC converter

November 22, 2019 //By Nick Flaherty
The TDK-Lambda FQB 20A, 40V active filter is designed to protect a DC-DC converter for the harsh environments found in 28V vehicle and airborne applications.
The TDK-Lambda FQB 20A, 40V active filter is designed to protect a DC-DC converter in the harsh environments found in 28V vehicle and airborne applications.

TDK has launched a series of 20A, 40Vdc active filter modules to protect a DC-DC converter against input voltage surges and spikes.

The TDK-Lambda FQB MIL-COTS series is designed for the harsh environments found in 28Vdc nominal input vehicle and airborne applications. The active filter sereies has high differential and common mode noise attenuation, simplifying system level compliance to the MIL-STD-461(F, G) standard. The module’s surge and spike protection also assists qualification to MIL-STD-1275(D, E) and RTCA/DO-160G (Sec 16-18). Qualifying testing is consistent with MIL-STD-883F and MIL-STD-202G.

The FQB has an operating input voltage range of 8.5Vdc to 40Vdc, and can withstand transients of up to -50 to +210V. Additionally it provides reverse input, under/over voltage and over current protection. A remote on/off function and an open collector DC Good / Fault signal is fitted as standard. Vehicle battery drain is minimised by a no-load current consumption of typically 3mA, which is reduced to just 1.5mA when the remote on/off function is initiated. The total DC resistance of the filter is typically 30mΩ, further minimising power losses.

The FQB active filter series has standard production screening (-S suffix) and a baseplate temperature rating of -40°C to +115°C, or enhanced screening (-M suffix) and an extended temperature rating of -55°C to +115°C. Enhanced screening includes functional testing at high and low temperatures and a 96 hour burn-in period with temperature cycling.

The PCB mount is cooled using either an industry standard quarter brick heatsink, or conduction cooled via a cold plate. The non-flanged package measures 60.6 x 39 x 12.7mm (L x W x H) and the flanged version 60.6 x 55.9 x 12.7mm. All models have been safety certified to IEC/UL/CSA 60950-1, IEC/UL/CSA 62368-1 (pending) and carry the CE mark.

www.emea.lambda.tdk.com/uk/fqb


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