NL865H2 Hardware Design Guide
1VV0301616 Rev. 7
Page
23
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2020-04-20
Band66
，
Pout=23dBm
116
183
mA
Band71
，
Pout=23dBm
129
210
mA
Band85
，
Pout=23dBm
113
184
mA
General Design Rules
The principal guidelines for the Power Supply Design embrace three different design
steps:
•
the electrical design
•
the thermal design
•
the PCB layout.
4.4.1.
Electrical Design Guidelines
The electrical design of the power supply depends strongly from the power source where
this power is drained. We will distinguish them into three categories:
•
+5V input (typically PC internal regulator output)
•
+12V input (typically automotive)
•
Battery
4.4.1.1.
+5V/+12V Source Power Supply Design Guidelines
•
The desired output for the power supply is 3.3V, hence due to the difference
between the input source and the desired output, a switching power supply will be
preferable because of its better efficiency.
•
When using a switching regulator, a 500kHz or more switching frequency regulator
is preferable because of its smaller inductor size and its faster transient response.
This allows the regulator to respond quickly to the current peaks absorption.
•
In any case the frequency and Switching design selection is related to the
application to be developed due to the fact the switching frequency could also
generate EMC interferences.
•
For car PB battery the input voltage can rise up to 15,8V and this should be kept in
mind when choosing components: all components in the power supply must
withstand this voltage.
•
A Bypass low ESR capacitor of adequate capacity must be provided in order to cut
the current absorption peaks, a 100μF tantalum capacitor is usually suited.
•
Make sure the low ESR capacitor on the power supply output (usually a tantalum
one) is rated at least 10V.
•
For Car applications a spike protection diode should be inserted close to the power
input, in order to clean the supply from spikes.
•
A protection diode should be inserted close to the power input, in order to save the
module from power polarity inversion. This can be the same diode as for spike
protection.
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