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ALQ07 DC-DC Converter Technical Reference Notes

DATE: Aug., 9, 2003

Safety Consideration

For safety-agency approval of the system in which the power module is used, the

power module must be installed in compliance with the spacing and separation

requirements of the end-use safety agency standard, i.e., UL1950, CSA C22.2 No.

950-95, and EN60950. The ALQ07 series input-to-output isolation is an basic

insulation. The DC/DC power module should be installed in end-use equipment, in

compliance with the requirements of the ultimate application, and is intended to be

supplied by an isolated secondary circuit. When the supply to the DC/DC power

module meets all the requirements for SELV(<60Vdc), the output is considered to

remain within SELV limits (level 3). If connected to a 60Vdc power system, double or

reinforced insulation must be provided in the power supply that isolates the input

from any hazardous voltages, including the ac mains. One input pin and one output

pin are to be grounded or both the input and output pins are to be kept floating.

Single fault testing in the power supply must be performed in combination with the

DC/DC power module to demonstrate that the output meets the requirement for

SELV. The input pins of the module are not operator accessible.

Note: Do not ground either of the input pins of the module, without grounding

one of the output pins. This may allow a non-SELV voltage to appear between

the output pin and ground.