Converters and Power Supplies for the Communications, Automotive & Marine Industries


PV-A range dual output converters with switched output

Some automotive equipment, such as In Car Entertainment (ICE) usually has two links to the vehicle’s electrical system, one for security and one for switching the equipment on and off. 

The security circuit senses when the equipment has been removed from the vehicle by having a permanent connection to the vehicle battery. The on/off function is controlled from the ignition switch so that when the ignition key is removed, the ICE equipment is turned off, preventing the battery from becoming discharged. Also, some truck manufacturers run other 12V equipment, such as a cigar lighter socket from the same feed, while others prefer to leave it on. 

Alfatronix have developed three voltage converters, a 3Amp, 6Amp (continuous) and a 12A (continuous), which overcome these configuration problems. The Alfatronix converters mimic the 12V battery and 12V ignition function by providing two outputs, either of which can provide full power. One output is available whenever the 24V battery is connected. The other output is switched by the 24V ignition switch. Now the ICE equipment can be fitted to the 24V truck as simply as fitting it to a 12V car.

PV3s A

Of course, the Dual Output Range can be used for any application where a dual output is required or where a switched and permanent or memory connection must be retained.


Part Number Cont/Int Power Nominal Voltage Dimensions Weight
PV3s-A 3A/6A non-isolated 24Vdc input, 12Vdc output 67x87x50mm 200g
PV6s-A 6A/10A non-isolated 24Vdc input, 12Vdc output 89x87x50mm 250g
PV12s-A 12A/18A non-isolated 24Vdc input, 12Vdc output 126x87x50mm 425g


Input voltage range 17-32Vdc
Output voltage 13.6Vdc +15% -20% at extremes of temperature, load, input tolerance, etc.
Output power
As stated, from either output or combination of both. intermittent ratings as stated, 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 <50mV pk-pk (100mV on 24V units) at continuous load. Meets CISPR25 and VDE0879-3
Off load current (quiescent current) <15mA
Power conversion efficiency Typically: 90%
Mean time between failures >162 years (HRD4)
Operating temperature -25ºC to +30ºC to meet this specification table
+30ºC to +80ºC de rate linearly to 0A
Storage temperature -25ºC to +100ºC
Operating humidity 95% max., non-condensing
Casework Anodised aluminium, glass filled polycarbonate, dust water and impact resistance to IP533
Connections Four 6.3mm push-on flat blade connectors, 6-way 070 connector (PV12s-A)
Output indicator Green LED adjacent to output terminals, None on PV12s-A
Mounting method ‘Click ‘n’ fit mounting clip, fitted separately using three hole fixture
Safe area protection: Over current Limited by current sensing circuit
Over heat Limited by temperature sensing circuit
Transients Protected by filters and rugged component selection
Catastrophic failure Protected by internal input and output fuses
Approvals 2004/108/EC The general EMC directive
10R-04 6198 The automotive directive
93/68/EEC The CE marking directive
Markings CE and E marked