FAN53555UC03X

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The FAN53555UC03X is a part of the FAN53500 family of pulse width modulation (PWM) DC-DC switching regulators. This family of devices is designed to regulate voltage and current for applications such as automotive, consumer, computing, and industrial. The FAN53555UC03X is a synchronous step-down switching regulator designed to provide up to 2.4A of output current. It contains an active voltage positioning system, which regulates the output voltage to within ±1%. The device is available in a 4-pin 1.2mm x 1.2mm packages.

Application Field of FAN53555UC03X

The FAN53555UC03X is suitable for a variety of DC/DC applications, such as automotive, consumer, computing and industrial. It can be used to power processors, ASICs, FPGAs, and other integrated circuits or systems that require a precise and stable output voltage. It can also be used to power LED lighting and displays, where precise voltage regulation and long life are essential.

Working Principle of FAN53555UC03X

The FAN53555UC03X DC/DC switching regulator consists of an internal PWM controller, an external power switch, and a corresponding LC output filter. The internal PWM controller monitors the output voltage and adjusts the duty cycle of the external power switch in order to regulate the output voltage. The duty cycle of the power switch determines how much current is injected into the LC output filter. The current in the LC output filter is then used to provide the output voltage.

When the input voltage is greater than the output voltage, the regulator turns on the external power switch and allows current to flow into the LC output filter. When the input voltage is less than the output voltage, the regulator turns off the external power switch and prevents current from flowing into the LC output filter. This process is repeated periodically to maintain a stable output voltage.

The FAN53555UC03X also includes under-voltage and over-voltage protection circuitry to prevent damage to the output devices in case of a short circuit or over-voltage conditions. The device also includes short-circuit protection, overtemperature shutdown, ESD protection, and a high-side current source that is adjustable through an external resistor.

Conclusion

The FAN53555UC03X is a part of the FAN53500 family of PWM DC-DC switching regulators. It is designed to provide up to 2.4A of output current and ±1% output voltage accuracy. The device includes under-voltage and over-voltage protection, short-circuit protection, overtemperature shutdown, ESD protection, and a high-side current source. The FAN53555UC03X is suitable for a variety of DC/DC applications, such as automotive, consumer, computing and industrial.

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