Kontron AM4904, User Manual

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Power Considerations
91 AM4904 User Guide
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5 Power Considerations
5.1 AM4904 Input Voltage Ranges
The AM4904 board has been designed for optimal power input and distribution. Still it is necessary to
observe certain criteria essential for application stability and reliability.
The AM4904 requires two power sources, the module management power (nominal: 3.3V DC) and payload
power (nominal: 12V DC).
The following table specifies the ranges for the different input power voltages within which the board is
functional. The AM4904 is not guaranteed to function if the board is not operated within the operating
range.
5.2 Carrier Power Requirements
5.2.1 Payload Power
Payload power is the power provided to the module from the backplane for the main function of the module.
It is recommended that Payload Power voltage provided by the system is at the higher end of the specified
voltage range under no load conditions so that under high load conditions the current will be as low as pos-
sible.
The payload power voltage shall be at least 10.8 V and not more than 13.8 V at the module contacts during
normal conditions under all loads (see “DC Operational Input Voltage Ranges” on page 91).
The bandwidth-limited periodic noise due to switching power supplies or any other source shall not exceed
200 mV peak to peak.
Table 5-1: DC Operational Input Voltage Ranges
Input Supply Voltage
Absolute Range
(according AMC.0)
Operating Range
(backplane requirements)
Payload Power
(nominal: 12V DC)
10.0 V min. to 14 V max. 10.8 V min. to 13.2 V max.
Module Management Power
(nominal: 3.3V DC)
3.0 V min. to 3.6 V max. 3.135 V min. to 3.465 V max.
WARNING
The AM4904 must not be operated beyond the absolute range indi-
cated in the table above. Failure to comply with the above may result
in damage to the board.