SC4518HSETRT

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SC4518HSETRT Application Field and Working Principle

The SC4518HSETRT is a PWM-Capable DC/DC Switching Regulator is designed by the Integral Electronics Company. It has a high level of output ripple rejection, a wide input voltage range, and a current limit protection feature. It is used in a variety of applications, including motor control, instrumentation, automotive, and heavy-duty power transfer.

General Characteristics of SC4518HSETRT

The SC4518HSETRT is designed as a low-dropout, fully integrated DC/DC switching regulator with adjustable current limitation. It features a wide input voltage range of 4.75V to 42V and an output of 3V to 36V. It is capable of delivering up to 1.8A peak output current, with an operating temperature of -40 to 125 °C and a maximum current of 4.0A. Other features include fast transient response, digital control (which enables extra features and flexibility) and programmable timer-based soft-start and hiccup protection. It also offers over temperature, over current and ESD protection.The SC4518HSETRT also supports various PWM/FM modulation techniques, and can be operated in constant voltage, constant current, constant power and protection modes. Furthermore, it can provide multiple protection mechanisms, such as over-temperature protection and current limit protection, with an adjustable protection level. This makes the SC4518HSETRT a reliable voltage regulator solution for many industrial and home applications.

Working Principle of SC4518HSETRT

The SC4518HSETRT is designed as a PWM-Capable DC/DC Switching Regulator. It works by first sensing the input voltage and then comparing the input voltage to a reference voltage. The reference voltage is generated by the internal voltage reference blocks. When the voltage difference is greater than the reference, a control signal is generated to turn on the power switch and start the conversion.Once the power switch is on, the inductor on the input side of the regulator stores energy, which is then switched to the output capacitor. This is how the output voltage is regulated. During the switching cycles, the inductor current never becomes zero, thus the voltage across it (Vin-Vout) helps maintain sufficient energy in the inductor, ensuring smooth and stable output voltage.The output voltage is kept constant through the constant-on-time (COT) regulation technique. When the control signal is active, the PWM signal also keeps the switch on for the little time necessary to ensure a stable output voltage. This makes the SC4518HSETRT a reliable and efficient solution for most power regulation applications.

Conclusion

The SC4518HSETRT is a versatile DC/DC switching regulator capable of delivering up to 1.8A peak output current. It is suitable for a wide variety of applications, including motor control, instrumentation, automotive, and heavy-duty power transfer. It offers a wide input voltage range of 4.75V to 42V and output of 3V to 36V along with a programmable timer-based soft-start and hiccup protection. The SC4518HSETRT is a reliable and efficient solution for most power regulation applications.

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