VCC is a common term in circuits that means positive supply voltage. In digital or analog circuits, developers often need a widely available power supply to ensure that the circuit can operate properly. In such cases, the VCC voltage is usually set to a fixed value, such as 5V or 3V, so that all devices can use the same power supply.
In some circuits with high precision requirements, the VCC power supply needs to be extremely accurate and reliable in order to ensure stable circuit operation. In this case, developers often use a specific power supply or interference source to fulfill the circuit’s need for a power supply. Common interference sources include switching power supplies, linear power supplies, etc., which are capable of stabilizing the output power supply voltage with high accuracy and low fluctuation.
The VCC supply voltage, unlike other supply voltages, is often involved in the pcb design as a very important circuit parameter. Therefore, sometimes the change of VCC supply voltage can bring very important effects. For example, when the VCC supply voltage falls below a certain level, the field effect tubes in a CMOS circuit can become abnormally slow, which can cause the circuit to not work properly. Developers need to consider the effects of supply voltage on circuit performance and take steps to improve circuit robustness and performance.
VCC in circuit fault quick repair process: two steps
- Lock down the fault area. VCC power supply to all circuits divided into areas, along the power supply copper foil to find the fork, and then in the fork with a knife to cut, the intention is to divide the power supply circuit into two pieces, divided into fault areas and non-fault areas. Respectively measure the resistance to ground, the resistance to ground is zero on the side is the fault area, and then along the copper foil to find the next fork, so that in turn, the fault range step by step to narrow down, and finally locked in a very small range.
- Locked in a certain range, we have to check the relevant components, generally easy to cause short-circuit failure of integrated circuit chips, capacitors and transistors, so it should be focused on checking in order from large to small. First of all, for the integrated chip, you can lift the power supply foot, so that it is out of the power supply circuit, and then go to measure the VCC resistance to ground, such as no longer short-circuit, is the chip is damaged, otherwise continue to look for until troubleshooting. Troubleshooting, and then connect the previously opened copper foil can be.
VCC supply voltage is not only the cornerstone of the stable operation of the circuit, but also an important parameter of the circuit performance optimization. From the provision of a stable forward voltage, to ensure the stable operation of the circuit in the high-precision requirements, VCC plays an indispensable role. It is not only an important guarantee for the normal operation of the circuit, but also an important parameter that cannot be ignored in circuit design and maintenance.
