User's Manual

MDSLN200Integrator’sGuide 05‐6949A01,revision3
[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): 1.3 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 LN200 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 exceed +41.3dBm.
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