LANG
Security IOT
According to USB2 0 standard, the power supply conforming to USB shall be between 4.75V and 5.25V and provide a continuous current of at least 0.5A.
Technical features
According to USB2 0 standard, the power supply conforming to USB shall be between 4.75V and 5.25V and provide a continuous current of at least 0.5A.
However, some faults may still occur, which is easy to damage the downstream electronic circuits without protective measures. Typical faults include: inductive peak voltage, connection to high-voltage charger (user operation error), and connection to power supply with polluted power supply quality. Although the voltage of a typical calculator power supply is controlled at 5V + / - 5%, this does not mean that the voltage of the USB port will not exceed 5.25V. The induced voltage spike can exceed 8V and damage the peripherals without protective measures. The peak voltage phenomenon occurs when there is a certain inductance on the power bus and the current changes rapidly. The rapid change of current may come from hot plug of peripherals, shutdown of internal system, or other internal power supply fluctuations. The inductance may be caused by the use of magnetic components in the design, or it may be caused by long cables and other power bus components. The larger the inductance of the power bus, the more serious the peak voltage phenomenon in the peripheral. In short, USB devices may withstand voltages exceeding 5V, and protective measures should be taken against this situation.
According to USB2 0 standard, the power supply conforming to USB shall be between 4.75V and 5.25V and provide a continuous current of at least 0.5A.
Technical features
According to USB2 0 standard, the power supply conforming to USB shall be between 4.75V and 5.25V and provide a continuous current of at least 0.5A.
However, some faults may still occur, which is easy to damage the downstream electronic circuits without protective measures. Typical faults include: inductive peak voltage, connection to high-voltage charger (user operation error), and connection to power supply with polluted power supply quality. Although the voltage of a typical calculator power supply is controlled at 5V + / - 5%, this does not mean that the voltage of the USB port will not exceed 5.25V. The induced voltage spike can exceed 8V and damage the peripherals without protective measures. The peak voltage phenomenon occurs when there is a certain inductance on the power bus and the current changes rapidly. The rapid change of current may come from hot plug of peripherals, shutdown of internal system, or other internal power supply fluctuations. The inductance may be caused by the use of magnetic components in the design, or it may be caused by long cables and other power bus components. The larger the inductance of the power bus, the more serious the peak voltage phenomenon in the peripheral. In short, USB devices may withstand voltages exceeding 5V, and protective measures should be taken against this situation.