INTEGRATED CIRCUIT, ASSOCIATED START-UP CIRCUIT AND START-UP METHOD THEREOF
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United States of America
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Issued Date -
Feb 13, 2025
app pub date -
Aug 6, 2024
filing date -
Aug 6, 2024
priority date (Note) -
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Abstract
An integrated circuit for a switching power supply circuit has an enable pin, a power supply pin, a switch pin, a ground pin, a power switch and an amplifier. The enable pin receives an enable signal. The power supply pin is coupled to a power supply capacitor. The switch pin receives an input voltage. The power switch has a normally-on switching device and a normally-off switching device. A first terminal of the normally-on switching device is coupled to the switch pin. A first terminal of the normally-off switching device is coupled to a second terminal of the normally-on switching device, a second terminal of the normally-off switching device is coupled to the ground pin. The amplifier provides an amplified signal based on a difference between a voltage at the power supply pin and a voltage at the second terminal of the normally-on switching device to control the normally-on switching device.
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