Neoway N723-EA - Figure 5-1 Voltage Drop of the Power Supply; Figure 5-2 Recommended Design 1

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N723-EA Hardware User Guide

Chapter 5 Application Interfaces

Figure 5-1 Voltage drop of the power supply.

Min: 3.4V

VBAT

Burst

VBAT≥3.4V

Drop

Never use a diode to make the drop voltage between a higher input and module power. The forward voltage drop

of the diode has two characteristics: one is that it increases with the increase of forward current; the other is

that it increases significantly at a low temperature. If there is an instantaneous high current, the instantaneous

increase of forward voltage drop will lead to unstable operating voltage of the module, or even damage the

module.

The power supply design of the N723-EA module is determined by the power input voltage. The

designs are classified by power input voltage as follows:

⚫

Supports the 3.4V - 4.2 V power input (typical value: 3.8 V, using the battery for power supply)

⚫

Supports the 4.2V - 5.5 V power input (typical value: 5.0 V, using the internal rectifier of the

computer for power supply)

⚫

Supports the 5.5 V - 24 V power input (typical value: 12 V, typically applicable to the automobile

industry)

The recommended 3.4V to 4.2 V input design is as follows:

Figure 5-2 Recommended design 1

N723-EA

Module

Power Supply

C1 C2 C3 C4 C5

Test point

I_max

100μF 10μF 100pF 33pF 0.1μF

VBAT

TVS