In-Depth Analysis of ESD Protection Circuits and Discrete Component BUCK Power Supply Design

In today’s highly digitized era, the stability and reliability of electronic devices are critical to user experience. Among these, ESD (Electrostatic Discharge) protection circuits— an indispensable component in electronic equipment— have grown increasingly vital. Recently, a detailed technical guide on ESD protection circuits has circulated widely online, sparking enthusiastic discussions among electronic engineers.

According to the material, it thoroughly explains the working principles of ESD protection circuits, component selection, and key considerations for practical applications. Under normal conditions, ESD devices remain inactive, but when the voltage at external interfaces exceeds their breakdown voltage, these devices rapidly conduct, diverting current to ground and safeguarding downstream circuits from damage. The document also emphasizes that when selecting ESD components, the system operating voltage must be lower than the ESD device’s working voltage (VRWM) to ensure effective protection.

Additionally, the material delves into the differences between unidirectional and bidirectional ESD devices. Bidirectional ESD devices can handle signals with both positive and negative breakdown voltages, whereas unidirectional ESD devices only respond to positive breakdown voltages. For negative voltage protection, unidirectional ESD devices demonstrate superior performance. The guide also introduces several common ESD models and their discharge curves, providing engineers with valuable reference data.

A critical factor in the practical application of ESD devices is parasitic capacitance, which can adversely affect high-speed circuit interfaces—such as slowing down signal rise and fall times. Therefore, when choosing ESD components, engineers should select devices with appropriate parasitic capacitance based on the characteristics of the target interface.

Notably, the material also provides a detailed overview of the IEC 61000-4-2 standard and its application in ESD protection. This standard is divided into four levels, but compliance only indicates the device’s own protective capability—not necessarily the resilience of downstream circuits to corresponding discharges. Thus, when selecting ESD devices, engineers must also consider their clamping voltage to ensure the safety of the entire circuit system.

Beyond ESD protection circuits, Baishengda Electronics also shares practical insights on designing BUCK power supplies using discrete components. As a common power management solution in electronic systems, the design and optimization of BUCK power supplies are essential for enhancing system performance. Through real-world case studies, the guide explains the origin of triangular waves, discrete component selection, and key considerations in power supply design—offering engineers invaluable hands-on experience.

​About Bestar Electronic​
Shenzhen Bestar Electronics Technology Co., Ltd. is a modern high-tech manufacturing enterprise integrating R&D, production, sales, and service. Our business center is located in Changping Business Building, Shihua Road, Futian District, while our factory and warehouse are situated in Bao’an District. We operate over 500㎡ of office space and more than 5,000 ㎡ of factory space.

Our company specializes in the production and sales of LCD screens (3.5–55 inches), touch panels, and display kits, with over 20 years of experience in LCD manufacturing. We offer OEM services for modifying original panels (below 55 inches) into outdoor high-brightness displays and support product R&D and customization—delivering comprehensive solutions and one-stop services for win-win partnerships.

We are an authorized distributor for BOE’s full range of display products and maintain long-term strategic partnerships with leading manufacturers such as CSOT (China Star Optoelectronics), HKC, Tianma, Lontar, AU Optronics, Innolux, HC (HannStar), LG, and JDI.

​Our Advantages:​​

• Competitive factory-direct pricing
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• Support for customized and differentiated solutions