HE910 Hardware User Guide
1VV0300925 Rev. 32 Page 45 of 111 2019-11-25
An example of linear regulator with 5V input is:
Figure 5-1 Linear regulator
5.3.1.2. + 12V input Source Power Supply Design Guidelines
• The desired output for the power supply is 3.8V, hence due to the big difference
between the input source and the desired output, a linear regulator is not suited
and shall not be used. A switching power supply will be preferable because of its
better efficiency especially with the 2A peak current load represented by the
HE910.
• 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.
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