NCP1575DG

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NCP1575DG is a DC-DC switching controller that implements a Pulse width modulation (PWM) for boosted and SEPIC power-supply designs. This current-mode, step-up/step-down controller uses a Constant On Time (COT) control scheme to regulate the output voltage and optimize power efficiency. It features a broad range of frequency and duty cycle control, along with protection features. NCP1575DG is an integrated single-switch, high frequency DC-DC converter with a current-mode control scheme. The device consists of a control block, high-side and low-side drivers, an internal power switch, and a number of protection circuits packaged in a compact package.

Application

NCP1575DG is suitable for applications involving its core operating mode, step-up/step-down conversion. It is able to generate any output voltage from above or below the input voltage as long as both limits are within the limit specified. It can also power multiple outputs with precise regulation. NCP1575DG is used in many portable and battery powered applications, including ultra-low-noise and continuous conduction mode (CCM) for highly efficient dc-dc conversion. Some of these applications include battery-operated chargers, power supplies for cellular phones and personal digital assistants, portable electronic instruments, automotive applications such as car stereos, liquid crystal displays, high-power LED drivers and other power supply applications.

Working Principle

NCP1575DG works on PWM principle in which the output voltage is a regulated form of the input voltage. The Pulse Width Modulation (PWM) technique is used to convert a dc input supply to a variable dc output voltage. The duty cycle of the PWM signal is the ratio between the period of the rectangular wave and the "on time". This is a proportionally based system, so a higher duty cycle will result in a higher voltage output and a lower duty cycle will result in a lower voltage output.The output voltage level is controlled by the comparator which continuously monitors the output voltage and compares it to the desired setpoint. The error between the two signals is used to adjust the on-time of the PWM signal for output voltage regulation.

The internal control block provides basic features like softstart, current limit and output over-voltage protection and slew rate adjustment. The internal high-side and low-side drivers provide internal Rds_on power loss reduction and EMI reduction. The internal power switch also ensures that the output voltage is as desired. The internal reference and comparators are also used to protect the NCP1575DG from faults such as over-current and over-voltage by performing a functional shutdown.

Conclusion

NCP1575DG is a versatile DC-DC switching controller with a current-mode control scheme that is suitable for both step-up and step-down conversion applications. It is a compact single-switch, high-frequency DC-DC converter with features like softstart, current limit and output over-voltage protection, low-side and high-side drivers, and internal power switch for power efficiency and EMI reduction. NCP1575DG is used in many portable applications, such as battery-operated chargers, power supplies for cellular phones and other power supply applications.

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