Abstract: Disclosed are a chip verification structure, a chip verification system, and a chip verification method. The chip verification structure includes an analog chip, the analog chip includes at least one analog module. Since the analog chip is homologous with the sample of the chip design, a functional difference between the analog chip and the analog function module of the chip design may be reduced. Since the analog chip is connected to the FPGA chip via the plurality of types of interfaces, a difference between an interface of the analog chip and the FPGA chip and an interface of the analog function module and the digital function module of the chip design may be reduced, so that a verification accuracy of the chip design may be improved and a verification period of the chip design may be reduced.

Abstract: A control circuit and a control method of a switching power supply, according to feedback signals on a pin FB and a pin CS, a constant current control module generates and outputs a control signal to control an output current of the switching power supply, thereby regulating duty cycle of a first transistor adaptively and controlling an output current Io of a power supply system to be constant; according to the feedback signals on the pin FB and on the pin CS, a constant current precision compensation module adaptively regulates circuit parameters of the constant current control module and a sample-and-hold module, preventing precision of constant current output from being influenced by change of a working mode and/or by variation of input conditions; when an output voltage changes, QR mode keeps unchanged or depth of a CCM keeps approximately constant.

Abstract: What disclosed are a control circuit and a control method of a switching power supply, according to feedback signals on a pin FB and a pin CS, a constant current control module generates and outputs a control signal to control an output current of the switching power supply, thereby regulating duty cycle of a first transistor adaptively and controlling an output current Io of a power supply system to be constant; according to the feedback signals on the pin FB and on the pin CS, a constant current precision compensation module adaptively regulates circuit parameters of the constant current control module and a sample-and-hold module, preventing precision of constant current output from being influenced by change of a working mode and/or by variation of input conditions; when an output voltage changes, QR mode keeps unchanged or depth of a CCM keeps approximately constant.