FAN53555BUC05X

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The FAN53555BUC05X is a high-performance step-down DC-DC switching regulator that operates with a low 6A average switch current and low 0.25mΩ RDS(ON) for the external switch. The device operates over an input supply voltage range of 4.5 V to 60 V (65 V surge) and provides a regulated output voltage adjustable from 0.8 V to 6 V. The maximum output current capability is 5.5 A.

The device has two operating modes. The Pulse Frequency Mode (PFM) mode is used to optimize efficiency when the current load is low while providing maximum efficiency by extending the pulse frequency until the current reaches the settings of the average current limit. When in Pulse Width Modulation (PWM) mode, the FAN53555BUC05X uses the peak current mode to maintain tight regulation with a low current load. With both operating modes, the FAN53555BUC05X exhibits excellent light load efficiency, great EMI performance, and up to a 95% efficiency peak.

The FAN53555BUC05X has a comprehensive list of different protections against hardware breakdowns, including over-current-limiting (OCL), hiccup over-current limiting (HOCL), short-circuit protection (SCP), thermal shutdown (TSD), under-voltage lockout (UVLO), and over-voltage protection (OVP). The adjustable OCL and HOCL levels with low internal resistance are ideally suited for LED drivers and applications requiring tight control of current limits.

The device also features a wide range of external components, which can be easily configured for a variety of applications. It provides a power-good (PGOOD) output, DRV_GATE, and a reference voltage output, which are used to report the status of the system and ensure that the device is operating correctly. Additionally, two feedback options (FB1 and FB2) are used to select one of two different compensation methods to control the output from 0.8 V to 6 V.

The FAN53555BUC05X can be used for a range of applications, such as Buck converters, DC motor drivers, HVAC motor drivers, DC/DC converter applications such as telecom power supplies, server power supplies, and computer power supplies. It is also suitable for industrial applications including automotives, lighting, and distributed power systems. It is a step-down DC-DC switching regulator, with the capability to support an input voltage of 4.5 V to 60 V and an adjustable output voltage from 0.8 V to 6 V, capable of providing up to 5.5 A output current.

In terms of its working principle, the device utilizes an external switch, connected between an input voltage (VIN) and an inductor, to transfer energy to the output filter, which consists of an output capacitor, COUT, and VOUT, connected in series with the resistor ROUT. The switching frequency of the device is regulated by the high-frequency constant, which is adjustable from 250 KHz up to 2.5 MHz. The pulse width (Duty Cycle) is varied according to the instantaneous output voltage and current requirements. When the voltage across COUT rises to the desired level, the device stops switching and enters into a low-power mode, when the switching cycle resumes at the next instant of time when the voltage across COUT drops below a preset threshold.

In conclusion, the FAN53555BUC05X is a high-performance, low-power DC-DC switching regulator, a step-down DC-DC switching regulator capable of providing up to 5.5 A of output current with an adjustable output voltage range of 0.8 V to 6 V. The device has a wide range of external components, and its two operating modes, Pulse Frequency Mode (PFM) and Pulse Width Modulation (PWM), ensure excellent light load efficiency and great EMI performance. Additionally, it is equipped with a comprehensive set of protective circuits to ensure its reliable operation. Its wide range of applications includes Buck converters, DC motor drivers, HVAC motor drivers, DC/DC converter applications such as telecom power supplies and server power supplies, and industrial applications such as automotives, lighting, and distributed power systems.

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