CHL8318-02CRT

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CHL8318-02CRT Application Field and Working Principle

CHL8318-02CRT is an advanced integrated MOSFET switch driver and synchronous boost controller from a line of DC-DC switching controllers by STMicroelectronics. The driver-MOSFET approach eliminates the need for an external driver, while the sensing scheme provides a tight current loop, radically improved transient response, and highest efficiency.

Application Field

CHL8318-02CRT is widely used in many applications in automotive, industrial and consumer electronics. Various applications include battery powered systems such as automotive, notebook and cellular phone, cellular phone and mobile electronic devices. It is ideal for e.g. DC-DC boost converters and SEPIC (Single Ended Primary Inductance Converter) applications in notebook & industrial power supplies and other power supplies requiring high efficiency and low stand-by power consumption.

Working Principle

CHL8318-02CRT contains a mix of features that guarantee low component count, excellent transient response and high efficiency. This boost controller uses MOSFET switch combined with its on-chip gate driver to eliminate the need of an external driver. Also, its internal slope compensation is programmable from 0 to 0.49V/µs (in the selected range).

The power stage includes a maximum drive output stage current of about 1.13A and an adjustable maximum total switch current of up to 5.0A. The advance current sensing circuit monitors the output current, sense the drain-source voltage, and corrects using a dynamic duty cycle correction. As a result, a tight voltage/current loop is achieved that provides high efficiency, excellent transient response and ensures no load operation.

CHL8318-02CRT provides full protection from over-current, over-voltage, under-voltage and thermal stress. The integrated circuits operate directly from the output power source, as low as 4V and up to 28V, making it suitable for systems such as DC-DC boost converters and Bridge converters requiring high efficiency, low stand-by power consumption and a low component count.

Conclusion

CHL8318-02CRT is a highly advanced DC-DC switching controller from STMicroelectronics with improved efficiency, low stand-by power consumption and a tight voltage/current loop. This compact integrated circuit is widely used in automotive, industrial, and consumer electronics applications, including battery powered systems such as automotive, notebook and cellular phone, Power supplies requiring high efficiency and low stand-by power consumption. It provides full protection from over-current, over-voltage, under-voltage and thermal stress, making it an ideal solution for any application.

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