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Data Sheets
DS1103 Hardware Installation and Configuration March 2004
225
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Power supply AutoBox One power supply
Tandem-AutoBox • Two power supplies (each identical to the AutoBox
power supply). They must both be connected.
• All specifications stated here are valid for each of
the two built-in power supplies.
Operating principle Two-stage switching power supply with wide input
voltage range and independent output regulation.
Input voltage • 8 V … 60 V DC normal operating range without
heater
• 8 V … 36 V DC normal operating range with
heater
• 100 V DC absolute maximum rating
• Load-dump protection up to 120 V
Input current • 20 A at 12 V nominal
• 10 A at 24 V nominal
Overcurrent
protection
• 32 A foldback current line
• 60 A external fuse
Start-up current ≤ 50 A
Quiescent current < 1 mA with remote off
Output voltages • +5 V, 20 A
• +12 V, 1.5 A
•–12V, 1.5A
Output power 135 W at 12 V nominal input voltage
Efficiency 60 % at 12 V nominal input voltage
Input/output isolation 250 V
Remote control Overvoltage protected remote on/off input. The
remote voltage should not exceed the supply voltage.
Overvoltage protection of the remote pin is also 100 V.
If you connect the remote pin to the car battery
directly, the AutoBox will always be turned on, and the
car battery will then soon be exhausted if the engine is
not running. A switch is therefore highly
recommended.
Input resistance at
remote input
• 47 kΩ tied to GND
• The input resistance also protects the remote input
if the remote signal is switched on while the supply
voltage is missing due to a blown fuse, for
example.
Parameter Specification
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