Neoway N10 - Figure 3-1 Current Peaks and Voltage Drops; Figure 3-2 Capacitors Used for the Power Supply

N10_Hardware_User_Guide
Copyright © Neoway Technology Co., Ltd.
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Figure 3-1 Current peaks and voltage drops
Figure 3-2 shows a recommended power supply design for the module.
Figure 3-2 Capacitors used for the power supply
Power Supply GPRS Module
Close to the pin of the module
D1
C1 C2 C3 C4
VBAT
Current testing point
I_max
C5
In the circuit, use TVS at D1 to enhance the performance of the module during a burst. SMF5.0AG
(Vrwm=5V&Pppm=200W) is recommended. A large bypass tantalum capacitor (220 μF or 100 μF) or
aluminum capacitor (1000 μF or 470 μF) is expected at C1 to reduce voltage drops during bursts together
with C2 (10 μF capacitor). In addition, add 0.1 μF, 100 pF, and 33 pF filter capacitors to enhance the
stability of the power supply.
A controllable power supply is preferable if used in harsh conditions. The module might fail to reset in
remote or unattended applications, or in an environment with great electromagnetic interference (EMI).
Use the EN pin on the LDO or DC/DC chipset to control the switch of the power supply as shown in
Figure 3-3.