ZL2004ALNFT

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The ZL2004ALNFT is a DC-DC switching controller, part of the voltage regulator range of PMICs. It is designed for applications where a high level of efficient and accurate control is required. It is capable of controlling forward, flyback, and SEPIC converter topologies. It has built-in protection features for reduced system cost and size.

Features

The ZL2004ALNFT has a wide range of features, including:

• Wide input voltage range (4.5V to 40V)
• 200kHz to 2MHz switching frequency range
• Up to 95% efficiency
• Over-temperature protection
• Over-current protection
• Fixed 7V reference voltage
• Built-in softstart
• Precision current limit
• Under-voltage lockout
• Small 2mm x 2mm 10-lead DFN package

Applications

The ZL2004ALNFT is suitable for a variety of applications that require a high level of efficient and accurate control. These include:

• Battery-powered portable devices
• Power supplies for computer and digital video products
• DC to DC Converters
• Automotive modules

Working Principle

The ZL2004ALNFT is based on the voltage mode linear topology. It works by controlling the ON and OFF times of the switches while maintaining a fixed switching frequency, and regulating the output voltage by adjusting the ON and OFF times of the switches. In this way, the output voltage is kept constant.

The ON and OFF times of the switches are regulated by two internal loop-control circuits. The error amplifier compares the output voltage to the reference voltage, and adjusts the ON and OFF times of the switches accordingly. The current limit circuit monitors the output current in order to prevent it from exceeding the set limit, and adjusts the ON and OFF times of the switches accordingly.

The ZL2004ALNFT also has a built-in Soft-Start circuit. This prevents the output voltage from increasing too quickly at startup, and therefore reduces peak inrush current. It also prevents overload due to high inrush current.

Conclusion

The ZL2004ALNFT is a DC-DC switching controller designed for applications that require a high level of efficient and accurate control. It is based on the voltage mode linear topology and has built-in protection features for reduced system cost and size. It is suitable for a wide range of applications, including battery-powered portable devices, power supplies for computer and digital video products, and automotive modules.

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