Evaluation Engineering - 28

DC/DC CONVERTERS
DC/DC converters come with a range of
capabilities, from low-power devices for IoT
and wearable applications to high-power
modules that can power servers as well as
storage and network equipment. Here is a
sampling of some products on the market.

Industrial-quality DC/DC converter

DIN rail-mount DDA DC/DC converters
TDK (TSE 6762) introduced TDK-Lambda brand DIN rail
mount DDA DC/DC converters, using step-down nonisolated
power modules using an input range of 9 up to 53Vdc, and
a wide adjustable output voltage range from 3.3 up to
24V. The DDA is suited for generating additional low cost,
high-current outputs from an existing 24V bus in industrial,
semi-fabrication and test and measurement equipment.
Three models are available in the DDA series. A single
nominal output +12V 20A, a dual output +12V 20A / +5V
20A and a dual output +12V 14A / -12V 8A. Output power is
typically 250W for each of the positive outputs and 75W for
the negative output. Convection cooled, the overall output
power is 250W, which can be increased to up to 500W with
forced-air cooling. Positive remote sense, remote on/off and
individual power good signals are standard. The DDA series
is highly efficient, up to 95%, reducing internal waste heat
for reliable operation. The models are 123.4mm high, 115mm
deep and have a very narrow 36.5mm width, providing
additional space on the DIN rail.

TDK-Lambda

EVALUATION ENGINEERING JULY 2020

ABSOPULSE Electronics released the LQC 2K-3U2LC, a liquid
cooled, industrial quality DC-DC converter that uses fieldproven technology to deliver up to 2000W output power. The
unit accepts an input of 600Vdc (400Vdc to 800Vdc range)
and provides 24Vdc/80A output voltage. A built-in output
separation diode allows parallel connection of several units
for higher system output. Custom input/output voltages are
also available. The LQC 2K-3U2LC liquid-cooled converter
is designed for dense enclosed spaces where heatsinks,
fan or pure convection cooling are not feasible. The unit is
typically used in vehicles, industrial automation and similar
heavy-duty applications. The LQC 2K-3U2LC uses liquid
coolant, and the cold plate has an embedded tube running a
loop of coolant liquid which ensures a -25ºC to +50ºC coolant
temperature range for full specification. The unit is connected
to the external customer cooling system, which provides the
liquid coolant. Optional internal temperature sensors can be
installed to monitor the liquid coolant temperature. The LQC
2K-3U2LC is equipped with heavy filtering on the input and
output, which contributes to low noise. This ensures that
the converters can be used in EMI sensitive environments
without additional filtering. The input meets EN55032 Class A
with wide margins; Class B is available as an option.

ABSOPULSE

Evaluation Engineering

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