WM_PRJ_M13_UGD_001 - 001
20th July 2004
© 2004
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Wavecom Confidential & Proprietary Information
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7.2 Power supply
7.2.1 General presentation
The modem is supplied by an external DC voltage (V+BATTERY) from +5.5 V to
+32 V.
Main regulation is made with an internal DC/DC converter in order to supply all
the internal functions with a DC voltage.
Correct operation of the FASTRACK modem in communication mode is not
guaranteed if input voltage (V+BATTERY) falls below 5.5 V.
7.2.2 Protections
The modem is protected by a 2.5 A / 250 V fuse directly bonded on the power
supply cable.
The modem is also protected against voltage over +32 V.
When input voltages exceed +32 V, the supply voltage is disconnected in order
to protect the internal electronic components from an overvoltage.
Filtering guarantees:
! EMI/RFI protection in input and output,
! Signal smoothing.
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