datasheet for DD 12
DD Series 12-24V ‘UP’
Voltage Converters
12V-24V ‘UP’
Converters for a wide
range of applications
If you need to fit 24V equipment onto a
12V electrical system, then an ‘up’
converter from the DD Series offers a fast
and easy way to configure your system.
Now with a range from 72W (3A output) to
600W (25A output), these products offer
state of the art designs for fast installation
and long term reliable operation.
400W and 600W 12-24V units
The latest addition to the range includes two high current
(17 and 25Amps output) units. These use state of the art designs with
efficiency up to 93% and practically all components mounted using
computer controlled surface mount technology (SMT). The result is a
robust product with low component mass. The mechanical aspects
include a brand new casing profile designed for maximum heat dissipation
as well as a new design of our highly successful mounting cradle that
allows the unit to be fully wired before being ‘clicked’ into place. This
provides for a faster installation time with mechanics capable of
withstanding long term vibration with no risk of screws falling out.
A Wide Range of Applications
Typical applications include the installation
of 24V equipment on 12V vehicles and
installation of specialist equipment
requiring higher operating voltages.
units from
are available
in this format
and casing.
The new 400W and 600W 12V-24V units shown here with the new
Phoenix connector. Supply INCLUDES the mating half and further eases installation
while providing a secure connection reinforced with additional pull resistance.
Also available in IP65
The DD Series 12-24V products are
available in either standard IP53 format
(like most Alfatronix converters) or the
Ruggedised IP65 versions. Just add –RU
to the part number. These are suitable
the installation is in a
particularly hostile
environment and
subject to
water and dirt
The 12V-24V converters have been used for a
variety of applications including bus ticketing
systems on mini buses and for 24V bow
thrusters on leisure craft.
For 24-12V products, see
For other DC-DC
variants, see
Product Coding
The product code is developed as follows taking
the DD 12-24 072-RU as an example:
DC input and output
Denotes 12V input, 24V output
Denotes Wattage
Denotes ruggedized IP65 version
weerr C
Coonnvveerrssiioonn for A
moottiivvee,, C
muunniiccaattiioonnss and M
Maarriinnee A
Choose your DD Series 12-24V ‘UP’ Product
Part Number
Nominal Voltage
DD 12-24 072
72W (3A) Non-Isolated
DD 12-24 168
168W (7A) Non-Isolated
12Vdc input, 24Vdc output
89 x 87 x 50mm
12Vdc input, 24Vdc output
167 x 87 x 50mm
DD 12-24 240
240W (10A) Non-Isolated
12Vdc input, 24Vdc output
217 x 87 x 50mm
DD 12-24 400
400W (16A) Non-Isolated
12Vdc input, 24Vdc output
233 x 125 x 74mm
DD 12-24 600
600W (25A) Non-Isolated
12Vdc input, 24Vdc output
283 x 125 x 74mm
Other output voltage configurations are available as special orders, please ask our sales team
Technical Data
Input voltage range
12 Vdc nominal (10.0V-15.0V)
Output voltage
27.2Vdc +/-5% at extremes of temperature, load, input tolerance, etc.
Continuous current rating
3A – 25A depending on model.
Intermittent rating
Continuous rating +20%, taken for a maximum of 2 minutes followed by 8 minutes rest
Transient voltage protection
Meets ISO7637-2 International standard for 24Vdc commercial vehicles
Electrostatic voltage protection
Meets ISO10605, ISO14892, >8kV contact, 15kV discharge
Output noise
<100mV pk-pk at continuous load.
Off load current (quiescent current)
<20mA (400W and 600W versions enable off), less than 100mA (72-240W units)
Power conversion efficiency
Typically: 93%
Operating temperature
-25ºC to +30ºC to meet this specification table
+30ºC to +80ºC de rate linearly to 0A
Storage temperature
-25ºC to +70ºC
Operating humidity
95% max., non-condensing
Anodised aluminium, glass filled polycarbonate, dust water and impact resistance to IP533.
Ruggedised versions also available to IP65
Four 6.3mm push on flat blade connectors (72-240W)
Five terminal connector with screw tightening with mating half supplied (400 and 600W
Output indicator
Green LED adjacent to output terminals
Mounting method
‘Click ‘n’ fit mounting clip, fitted separately using 3 hole fixing (4 hole on 400 and 600W)
Safe area protection: Over current
Limited by current sensing circuit
Over heat
Input/Output over voltage protection
Catastrophic failure
Limited by temperature sensing circuit
Protected by filters and rugged component selection
Controlled by internal circuitry
Protected by internal input and output fuses
2004/108/EC The general EMC directive
2006/96/EC The automotive directive
93/68/EEC The CE marking directive
CE and e marked
Alfatronix Limited, 29 Newtown Business Park, Poole, Dorset, BH12 3LL, England
Telephone: +44 (0)1202 715517. Fax: +44 (0)1202 715122
Website: E mail:
An ISO9001:2000 Registered Company
Made in the European Union by Alfatronix Ltd, Great Britain
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