Installation Instructions

MDSLN400Integrator’sGuide  05‐6738A01,revision8
[4]
4.0DCINPUTREQUIREMENTS
4.1PowerConsumptionRatings
The module has the following nominal power consumption ratings when operated at the required (V_NIC) input
voltage of 5.25 Vdc (-0.05/+0.05 V tolerance) and the required secondary input voltage of 10.0-60.0 Vdc on J900:
Active Receive Mode: 130mA
Transmit Mode (Worst Case Load): 2.5 Amperes
PowerRegulationmustbemetbyOEMtosatisfyLMAconditions:
OEM Integrator should consult with Product Support for individual circuit implementations. The input voltage on the 3-
pin J900 connector accepts a wide range and routes to onboard regulator on the LN400 module, but the V_NIC input
on the 52-pin connector must be carefully regulated.
At minimum, OEM Integrators must regulate the DC voltage applied to +5.25 Vdc (V_NIC), with a tolerance
of -0.05/+0.05 Vdc. This can be achieved using a voltage regulator similar to the Texas Instruments LMR12020,
which is a precision DC regulator. The external +5.25 VDC input is connected via pins 2, 24, 39, 41, and 52 of the 52
pin MiniPCIe card edge connector. The transmitter uses a closed-loop power detection circuit that ensures the peak
RF power will never the maximum ratings of table 5.3.
The input voltage range of the LMR12020 device in this configuration is 10V to 15V. Using switched-mode power
conversion technology, the LMR12020 can step down to voltages as low as 1.13V from a 10V input bus, with typically
less than 1 W of power dissipation. The output voltage must be set to a voltage of 5.25V, using an external trim
resistor. Operating features of the TI device include cycle-by-cycle current limiting, under-voltage lockout (UVLO),
on/off inhibit, output overcurrent protection, and over-temperature protection.
For example purposes, a circuit employing this method of regulation is shown below in schematic form.
5.0REGULATORYANDRFOUTPUTPOWERREQUIREMENTS
5.1TechnicalAssistance
Factory technical assistance is available by contacting GE MDS during business hours (8:30 AM to 6:00 PM Eastern
Time). Use one of the following means to contact the factory:
Telephone: [phone]
FAX: [phone]
E-mail: [e-mail]
Web: www.gemds.com