SG2846N

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SG2846N is an advanced current-mode pulse-width modulation (PWM) controller intended for the universal off-line applications, such as AC/DC and DC/DC switching power supplies. The SG2846N is particularly suited for high frequency and high density isolated DC/DC converters, eliminating the need for opto-couple feedback loops, reducing size and cost, while offering excellent line and load regulation. SG2846N features advanced features such as: double-loop control circuit with constant off-time and variable on-time, enhanced line transient response, programmable frequency up to 500kHz and other features. These features allow SG2846N to offer improved reliability and better light load efficiency for off-line digital power supplies.

Application Field

SG2846N is primarily used in the field of off-line power supplies, such as AC/DC and DC/DC switching power supplies. It is ideal for high frequency and high density isolated DC/DC power converters because it can eliminate the need for opto-couple feedback loops, reduce size and cost while offering improved line and load regulation. The wide range of soft start, programmable frequency and other features make SG2846N suitable for various types of power supplies and various kinds of applications.

Working Principle

SG2846N is a PWM controller operating in a current-mode flip-flop configuration. It is designed to drive a power switch, such as a MOSFET, which is connected to an inductor-capacitor network. The current-mode control analogy is that of a charge pump, in which the output voltage is controlled by the pump rate as the analog of the on-time of the switch; and the size of the charge tank is related to the off-time. SG2846N is equipped with an internal oscillator, whose frequency can be programmed up to 500kHz, driving a current-mode flip-flop to generate a PWM signal with adjustable duty cycle. SG2846N also has a comprehensive system of protections and monitors which detect the various operating states, including voltage over and under voltage, current limit, power off reset, and thermal shutdown.

SG2846N offers several control modes, all of which use an optimized transient response architecture. There is a double-loop control circuit with a constant off-time and variable on-time configuration that works particularly well in universal off-line power applications. This provides a wide range of solution for digital power supplies, offering excellent line and load regulation.

Conclusion

SG2846N is a PWM controller intended for the universal off-line applications, such as AC/DC and DC/DC switching power supplies. It is particularly suited for high frequency and high density isolated DC/DC converters since it can eliminate the need for opto-couple feedback loops, reduce size and cost, while offering excellent line and load regulation. SG2846N has advanced features such as double-loop control circuit with constant off-time and variable on-time, extended line transient response, and programmable frequency up to 500kHz that are beneficial for improving the reliability of off-line digital power supplies. It is the ideal choice of ICs for the applications in PMIC - Voltage Regulators - DC DC Switching Controllers.

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