W83320G

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Power management is an important element of modern electronic systems, as energy efficiency is becoming more and more important. Power management integrated circuits (PMICs) provide cost-effective solutions for efficiently managing multiple power-management tasks. PMICs are used in a wide range of devices, from mobile phones and handhelds to industrial and automotive systems. In particular, PMICs provide integrated solutions for voltage regulation, current limits, and power sequencing. One example of a PMIC is the W83320G, a DC-DC switching controller IC that provides high efficiency and accurate output voltage regulation. This article will explain the application fields and working principles of the W83320G.

Application Fields

The W83320G is designed for use in a wide range of applications, including PC motherboard voltage regulation, telecom power supplies, video cards, and server applications. In addition, it is suitable for notebook adapter applications such as USB, USB PD, and Type-C. It is also used in automotive and industrial power systems, such as 12V and 24V DC-DC converters. The IC provides many features to support a wide range of applications, including wide input voltage range from 4.5V to 40V, high current output capability up to 10A, low power dissipation in standby mode, remote ON/OFF control, and programmable frequency with OVP/UVP.

Working Principle

The W83320G uses a step-down switching regulator design, in which the output voltage is controlled by adjusting the duty cycle of the switching pulse as shown in the figure below. The switching frequency is internally set to 300KHz, and can be synchronised externally to match the resonant frequency of the inductor. The frequency synchronisation allows better interference suppression and higher output power.

The W83320G is able to provide an accurate output voltage with a wide input voltage range. This is made possible by the IC\'s voltage feedback loop. The output voltage is sensed through a resistive voltage divider, and is compared to the internal reference voltage. This error signal is used to control the duty cycle of the switching pulses. The greater the error signal, the larger the duty cycle of the switching pulses, and vice versa.

The W83320G also provides over-voltage protection (OVP) and under-voltage protection (UVP) features. These features are used to protect the system from unexpected supply voltage variations and short-circuits. The OVP feature will shut down the IC if the output voltage exceeds a preset threshold, and the UVP feature will shut down the IC if the output voltage falls below a preset threshold. These features help to ensure that the power system is operated safely and reliably.

Conclusion

In conclusion, the W83320G is a high efficiency DC-DC switching controller IC, which provides accurate output voltage regulation for a wide range of applications. Its wide input voltage range, high current output capability, low power dissipation, remote ON/OFF control, and programmable OVP/UVP features make it an ideal choice for many power management tasks.

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