Abstract: A package structure integrating a start-up component, a controller, and a power switch for a power converter, wherein the power converter has a coil having a first end and a second end, and the first end is coupled to a rectifier, the package structure including: a first die pad for carrying a chip of the controller; a second die pad for carrying a chip of the start-up component and a chip of the power switch, wherein the chip of the start-up component has a bottom surface providing a first drain contact; and the chip of the power switch has a bottom surface providing a second drain contact; and a plurality of external connection leads, of which one is connected with the second die pad via a wire and is used to couple with the second end of the coil.

Abstract: A controller providing protection function and frequency-reduction function for a power conversion application, including: a voltage sense pin; a current source; a switch having a first end coupled to the current source, a second end coupled to the voltage sense pin, and a control end coupled with a control signal; and a sampling unit having a first node coupled to the voltage sense pin, a second node for providing the control signal, a third node for receiving a PWM signal, a fourth node for providing a first sampled voltage for a protection function, and a fifth node for providing a second sampled voltage for a frequency-reduction function.

Abstract: A package structure integrating a start-up component, a controller, and a power switch for a power converter, wherein the power converter has a coil having a first end and a second end, and the first end is coupled to a rectifier, the package structure including: a first die pad for carrying a chip of the controller; a second die pad for carrying a chip of the start-up component and a chip of the power switch, wherein the chip of the start-up component has a bottom surface providing a first drain contact; and the chip of the power switch has a bottom surface providing a second drain contact; and a plurality of external connection leads, of which one is connected with the second die pad via a wire and is used to couple with the second end of the coil.

Abstract: A controller capable of detecting input power and generating a protection signal for a power converter, including: a high voltage start-up pin for connecting with an output terminal of an external start-up circuit; a sample-and-hold circuit for periodically sampling a voltage signal at the high voltage start-up pin to generate a detected signal; a brownout detector for generating a first power-fault signal according to the detected signal; an AC-off detector for generating a second power-fault signal according to the detected signal; and an OR gate having a first input end coupled with the first power-fault signal, a second input end coupled with the second power-fault signal, and an output end providing a third power-fault signal.

Abstract: A controller having adjustable frequency-reduction function for a power conversion application, comprising: a threshold voltage sampling unit, having a first node coupled to an external resistor network for generating a threshold voltage at the first node, which is then sampled by the threshold voltage sampling unit; a PWM unit having a second node for receiving a feedback voltage from a load, and a third node for providing a PWM signal of a switching frequency; and a driver unit for driving an external power transistor according to the PWM signal; wherein the switching frequency starts to decrease from a first frequency when the feedback voltage falls below a first threshold voltage, which is a first function of the threshold voltage.

Abstract: A controller providing protection function and frequency-reduction function for a power conversion application, including: a voltage sense pin; a current source; a switch having a first end coupled to the current source, a second end coupled to the voltage sense pin, and a control end coupled with a control signal; and a sampling unit having a first node coupled to the voltage sense pin, a second node for providing the control signal, a third node for receiving a PWM signal, a fourth node for providing a first sampled voltage for a protection function, and a fifth node for providing a second sampled voltage for a frequency-reduction function.