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Figure 1 Common project application power supply scheme
In the power supply scheme shown in Figure 1, AC-DC is responsible for providing AC and DC power conversion functions. It also undertakes the functions of safe isolation, anti-grid interference, and fluctuations of the power grid to provide a stable and reliable source of DC power for the post-stage. . For the internal DC-DC of the circuit function unit, its role is mainly to do the second-level regulator, and to supply power to other circuits of the circuit board.
Therefore, such applications of DC-DC generally do not need to bear the function of isolation anti-jamming, but other parameters such as volume, conversion efficiency, dynamic response, static power consumption and other higher requirements.
Small-sized board-level power supply solutions There are many non-isolated board-level power supply solutions, such as the linear regulator LM78xx series, switching regulator LM2576, etc. In general, it is difficult to achieve a balance between performance and volume, ie: Performance can be, but the volume is large; or the volume control is good, but the electrical parameters are not up to standard.
Zhiyuan Electronics' ZY78xxS series is a perfect combination of the two to realize high performance and small size. Taking the ZY7805S-500 as an example, the pins are fully compatible with the LM7805, allowing the output current to reach 500mA without any external circuitry, and the efficiency is as high as 95%. Its application is compared with the device configuration required by the LM7805 as shown in Figure 2. 
Figure 2 Comparison of external device requirements of ZY7805S-500 and LM7805
It can be seen that the scheme using ZY7805S-500 is simple to use, small in size and high in efficiency. More ZY7805S-500 parameters as shown below. 
Figure 3 Quick Start: 580uS Startup Time 
Figure 4 Smooth Startup Waveform 
Figure 5 High conversion efficiency: up to 96%
Larger output current models are: ZY78xxS-1000, ZY78xxS-1500 series, output currents up to 1A, 1.5A, to meet most of the board-level power supply needs. 
Figure 6 Ripple of a Linear Regulator
Common Power Supply Solutions for Engineering Applications In the power supply solutions for practical engineering applications, AC-DC centralized power supply and DC-DC power supply to the discrete circuit boards are used, as shown in Figure 1.
December 14, 2023