SC4808CMSTRT

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DC DC Switching Controllers

The SC4808CMSTRT is a DC/DC switching controller with a wide range of applications, occurring in areas such as automotive, industrial, healthcare and consumer electronics. It is specifically designed to provide a reliable constant voltage output over wide input supply range. The SC4808CMSTRT contains a controller that makes it fault tolerant to open circuit or short circuit of the load, as well as temperature fault protection from over/under temperature events. The device includes an integrated high side power MOSFET, adjustable current limit, over temperature protection, and under voltage lockout. The integrated error amplifier and pulse width modulation (PWM) control circuit allows the device to function as a DC-DC step-down converter and provide accurate output voltage regulation even under larger transient loads.The core of the SC4808CMSTRT is designed to have a wide range of operating voltages, enabling the controller to be used in different industrial and automotive platforms. The built-in low power standby mode reduces power dissipation, while the adjustable output enable control allows the device to be powered up or shut down with a single control signal. Furthermore, the device has protection against over voltage and over current, as well as diagnostic features to evaluate the external components.To ensure its wide range of application, the SC4808CMSTRT comes with flexible current limit, frequency modulation, and external soft-start control pin options. It has excellent rate line transient response which makes it ideal for applications that require fast load transient response. The synchronizable inputs allow synchronization to other oscillators, providing a fixed frequency or creating a spread spectrum for EMI reduction.

SC4808CMSTRT Working Principle

The SC4808CMSTRT works by first sensing the input voltage, which is then compared to a reference voltage. After this comparison, the PWM controlled output stage is regulated so that the output voltage is equal to the reference voltage. The SC4808CMSTRT contains a differential amplifier that amplifies the difference in voltages between the input voltage and reference voltage. The amplified signal is then sent to the PWM comparator, which then controls the output stage by turning off or on a selectable high side MOSFET. The PWM signal is modulated to change the duty cycle of the output signal and so control the output power. The SC4808CMSTRT is protected to operate with a wide range of input voltages and loads, so the device can be used in a variety of automotive and industrial applications. Control of the output current can be set from the internal error amplifier or from an external source, providing tighter control and improved power efficiency. The SC4808CMSTRT also includes protection from current surges and from over-temperature faults.

Applications

The SC4808CMSTRT is a versatile DC/DC converter that can be used for multiple applications requiring accurate voltage regulation. It provides a reliable constant voltage output over wide input supply ranges, and offers a switched high side MOSFET. This makes it ideal for automotive, industrial, healthcare and consumer electronics.In automotive applications, the SC4808CMSTRT can be used as a step-down converter in headlamp units, tail lamps and wheel speed sensors. In industrial applications, it can be used to regulate the power supply in industrial controllers and motor drive systems. In the healthcare and consumer electronics industry, the SC4808CMSTRT can be used for controlling the power of medical instruments, lab equipment and portable electronic devices.The SC4808CMSTRT is also widely used as an adjustable current limit converter that allows the user to set the operating current. This feature makes the device ideal for a range of applications, including industrial and automotive drivers, point-of-load regulators and isolated DC/DC converters.

Conclusion

The SC4808CMSTRT is a reliable DC/DC switching controller that is capable of providing a constant output voltage range over wide input supply ranges. Designed to be fault tolerant, it has integrated current limit, over temperature protection and under voltage lockout. It also has a wide operating voltage range, low power standby mode, adjustable current limit and external soft-start control. This makes it ideal for a range of applications, including automotive, industrial, healthcare and consumer electronics.

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