User's Manual

CE910-DUAL Hardware User Guide

1vv0301010 Rev .0 – 2012-07-10

 Make sure the low ESR capacitor on the power supply output (usually a tantalum

one) is rated at least 10V.

 A protection diode must be inserted close to the power input in order to save the

CE910-DUAL from power polarity inversion.

An example of a linear regulator with 5V input:

5.2.3. +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 suitable

and must not be used. A switching power supply would be preferable because of

its better efficiency, especially with the 1A peak current load represented by

CE910-DUAL.

 When using a switching regulator, a 500 kHz 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 must 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 for

this.

 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 must be inserted close to the power

input in order to clean the supply from spikes.