Abstract: In a described example, a circuit includes a port power path circuit having a power input and a first overload output. An interlock logic circuit has an interlock input, a current limit input and a current limit set output. The current limit input is coupled to the first overload output, and the interlock input is adapted to be coupled to a second overload output of a second port power circuit. The interlock logic circuit is configured to delay providing an output signal to the current limit set output responsive to an overload signal at the current limit input.

Abstract: Described examples include USB port controllers with a control circuit configured to switch from a normal first power mode to a second power mode for reduced power consumption in response a command from a port manager circuit, and to switch from the second power mode to the first power mode in response to detected activity on a communications connection, or a detected connection of a USB device to a USB port connector. After switching back to the first power mode in response to detected communications activity, the control circuit automatically switches operation of the USB port controller back to the second power mode unless a communications transaction addressed to the USB port controller is received within a non-zero certain time after switching from the second power mode to the first power mode.

Abstract: Described examples include USB port controllers with a control circuit configured to switch from a normal first power mode to a second power mode for reduced power consumption in response a command from a port manager circuit, and to switch from the second power mode to the first power mode in response to detected activity on a communications connection, or a detected connection of a USB device to a USB port connector. After switching back to the first power mode in response to detected communications activity, the control circuit automatically switches operation of the USB port controller back to the second power mode unless a communications transaction addressed to the USB port controller is received within a non-zero certain time after switching from the second power mode to the first power mode.

Abstract: Methods, systems, and apparatus to correct gate bias for a diode-connected transistor are disclosed. An example apparatus includes a first resistor including a first resistor terminal and a second resistor terminal; a second resistor including a first resistor terminal and a second resistor terminal; a first transistor including a current terminal and a gate terminal, the current terminal of the first transistor coupled to the first resistor terminal of the first resistor and the gate terminal of the first transistor is coupled to the second resistor terminal of the first resistor; and a second transistor including a first current terminal and a second current terminal, the first current terminal of the second transistor coupled to the gate terminal of the first transistor, and the second current terminal of the second transistor coupled the first current terminal of the second resistor.

Abstract: Methods, systems, and apparatus to correct gate bias for a diode-connected transistor are disclosed. An example apparatus includes a first resistor including a first resistor terminal and a second resistor terminal; a second resistor including a first resistor terminal and a second resistor terminal; a first transistor including a current terminal and a gate terminal, the current terminal of the first transistor coupled to the first resistor terminal of the first resistor and the gate terminal of the first transistor is coupled to the second resistor terminal of the first resistor; and a second transistor including a first current terminal and a second current terminal, the first current terminal of the second transistor coupled to the gate terminal of the first transistor, and the second current terminal of the second transistor coupled the first current terminal of the second resistor.

Abstract: Described examples include USB port controllers with a control circuit configured to switch from a normal first power mode to a second power mode for reduced power consumption in response a command from a port manager circuit, and to switch from the second power mode to the first power mode in response to detected activity on a communications connection, or a detected connection of a USB device to a USB port connector. After switching back to the first power mode in response to detected communications activity, the control circuit automatically switches operation of the USB port controller back to the second power mode unless a communications transaction addressed to the USB port controller is received within a non-zero certain time after switching from the second power mode to the first power mode.

Abstract: An isolated switching regulator has a closed-loop soft-start feature that allows tighter regulation of the output voltage and eliminates or reduces overshoot. It also has an optional reset feature which will resoft-start the regulator during recovery from a fault on the output voltage.

Abstract: An isolated switching regulator has a closed-loop soft-start feature that allows tighter regulation of the output voltage and eliminates or reduces overshoot. It also has an optional reset feature which will resoft-start the regulator during recovery from a fault on the output voltage.