FSQ0370RLA

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PMIC applications are changing rapidly. Now, AC DC converters, offline switchers, such as the FSQ0370RLA, have become increasingly important in today\'s power systems. This article discusses the application field and working principle of the FSQ0370RLA in detail.

FSQ0370RLA is a highly integrated PWM controller with an integrated power switch It integrates a low dropout (LDO) regulator, a power switch, a low side N channel FET and a 200V field-stop IGBT (Insulated Gate Bipolar Transistor). This integrated device offers a wide range of uses in many AC/DC converters, including applications that require high current density and high efficiency with low voltage drops and minimal switching losses.

The operating field of the FSQ0370RLA mainly includes applications for AC/DC converters, such as telecom power supplies, ATX power supplies, high power cordless tools and motor drives, among others. Thanks to its high power and very low power losses it enables power supply design at 12V-300V input and 5V-400V output, both with high efficiency and high current density.

The FSQ0370RLA features on-state low “overflow” voltage, which is especially advantageous for low voltage applications, such as USB adaptors, cordless tools and UPS systems. This also helps ensure a simple, low cost external circuit, increasing overall system efficiency. Additionally, the use of a High safe operating area (SOA) enables continuous conduction mode (CCM) operation, helping keep junction temperature low.

In terms of its working principle, the FSQ0370RLA is based on low voltage and low power FET (FETs) and power MOSFETs (power transistors). These FETs and power MOSFETs perform switching operations when triggered by an external PWM (pulse width modulation) signal. When the switch is “off”, the input voltage applied to the device is sent through the output low voltage FET and into the output side of the converter. When the switch is “on” then the input voltage will be sent through the output high voltage FET and into the output side on the converter. The FETs and power MOSFETS are typically low Vt (threshold Voltage) FETS or MOSFETs, thus allowing for higher system efficiencies under load. Furthermore, the use of FETs and power MOSFETs in the FSQ0370RLA improve the system’s speed and reduce power consumption of the circuit.

The FSQ0370RLA also offers many protection functions to ensure safe operation, such as over current, over voltage, and over temperature protection. Furthermore, the High SOA (Safe Operating Area) feature, praised above, allows for continuous operation of the circuit even at high frequencies, meaning that the FSQ0370RLA can be used in applications that require high speed operation.

In conclusion, the FSQ0370RLA is a highly integrated PWM controller with an integrated power switch, designed for AC/DC converters such as telecom power supplies, ATX power supplies, high power cordless tools and motor drives. The FETs and power MOSFETs offer improved system efficiency and speed and many protection functions ensure safe operation of the circuit. This makes the FSQ0370RLA an ideal solution for high efficiency and high current density applications.

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