User's Manual

N
720 Hardware User Guide
Copyright © Neoway Technology Co., Ltd 14
Figure 2-2 Current peaks and voltage drops
Figure 2-3 shows the reference design of the VRTC power supply.
Figure 2-3 Capacitors used for the power supply
In Figure 2-3, you can 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
F or 100 F) or aluminum capacitor (470 F or 1000 F) is expected at C1 to reduce voltage
drops during bursts together with C2 (10-F ceramics capacitor). It is recommended that you add
0.1 F, 100 pF, and 33 pF filter capacitors to enhance the stability of the power supply.
The module might fail to reset or power on/offin remote or unattended applications, or in an
environment with great electromagnetic interference (EMI). A controllable power supply is