Method and apparatus providing a multi-function terminal for a power supply controller
First Claim
1. A power supply controller circuit, comprising a current input circuit coupled to receive a current representative of an input voltage, the current input circuit to generate an enable/disable signal when the current crosses a threshold having a hysteresis of greater than or equal to zero, the power supply controller to activate and deactivate the power supply in response to the enable/disable signal.
0 Assignments
0 Petitions
Accused Products
Abstract
A power supply controller having a multi-function terminal. In one embodiment, a power supply controller for switched mode power supply includes a drain terminal, a source terminal, a control terminal and a multi-function terminal. The multi-function terminal may be configured in a plurality of ways providing any one or some of a plurality of functions including on/off control, external current limit adjustments, under-voltage detection, over-voltage detection and maximum duty cycle adjustment. The operation of the multi-function terminal varies depending on whether a positive or negative current flows through the multi-function terminal. A short-circuit to ground from the multi-function terminal enables the power supply controller. A short-circuit to a supply voltage from the multi-function terminal disables the power supply controller. The current limit of an internal power switch of the power supply controller may be adjusted by externally setting a negative current from the multi-function terminal. The multi-function terminal may also be coupled to the input DC line voltage of the power supply through a resistance to detect an under-voltage condition, an over-voltage condition and/or adjust the maximum duty cycle of power supply controller. Synchronization of the oscillator of the power supply controller may also be realized by switching the multi-function terminal to power or ground at the desired times.
-
Citations
112 Claims
- 1. A power supply controller circuit, comprising a current input circuit coupled to receive a current representative of an input voltage, the current input circuit to generate an enable/disable signal when the current crosses a threshold having a hysteresis of greater than or equal to zero, the power supply controller to activate and deactivate the power supply in response to the enable/disable signal.
- 6. A power supply controller circuit, comprising a current input circuit coupled to receive a current representative of an input voltage, the current input circuit to generate an enable/disable signal to activate the power supply when the current is in between a first current threshold having a first hysteresis greater than or equal to zero and second current threshold having a second hysteresis greater than or equal to zero, the second current threshold higher than the first current threshold, the current input circuit to deactivate the power supply when the current is less than the first current threshold, the current input circuit to deactivate the power supply when the current is greater than the second current threshold.
- 11. A power supply controller circuit, comprising a current input circuit coupled to receive a current representative of an on/off control signal applied to the power supply, the current input circuit to generate an enable/disable signal to activate the power supply when the current is in between a first current threshold having a first hysteresis greater than or equal to zero and second current threshold having a hysteresis greater than or equal to zero, the second current threshold higher than the first current threshold, the current input circuit to deactivate the power supply when the current is less than the first current threshold, the current input circuit to deactivate the power supply when the current is greater than the second current threshold.
-
12. A power supply controller circuit, comprising:
-
a current input circuit coupled to receive a current representative of an input voltage applied to a power supply, the current input circuit to generate a maximum duty cycle adjustment signal in response thereto; and
a control circuit to generate a switching waveform, the control circuit coupled to receive the maximum duty cycle adjustment signal, the control circuit to limit the duty cycle of the switching waveform to a maximum value in response to the maximum duty cycle adjustment signal, the switching waveform to regulate the power supply output.
-
-
19. A power supply controller circuit, comprising a current input circuit coupled to receive a current representative of an on/off control signal applied to a power supply, the current input circuit to generate enable/disable signal when the current crosses an on/off threshold having a hysteresis greater than or equal to zero, the power supply controller to activate and deactivate a power supply in response to the on/off control signal.
-
25. A power supply controller circuit, comprising:
-
a current input circuit coupled to receive a current, the current input circuit to generate an enable/disable signal to deactivate a power supply when the magnitude of current crosses below an on/off threshold having a hysteresis of greater than or equal to zero, the current input circuit to activate the power supply when the current crosses above the on/off threshold, the current input circuit to generate a current limit adjustment signal in response to the current; and
a control circuit coupled to receive the current limit adjustment signal, the control circuit coupled to adjust the current limit of a current through a power switch in response to the current limit adjustment signal.
-
-
29. A power supply controller circuit, comprising:
-
a current input circuit coupled to receive a current for adjusting a current limit of a power switch, the current input circuit to generate a current limit adjustment signal in response to the current; and
a control circuit coupled to receive the current limit adjustment signal, the control circuit coupled to adjust the current limit of a current through the power switch in response to the current limit adjustment signal.
-
-
43. A method for controlling a power supply, comprising:
-
receiving a first current representative of an input voltage to the power supply through a first terminal of a power supply controller;
activating an under-voltage signal if the first current falls below a first under-voltage threshold value;
deactivating the under-voltage signal if the first current rises above a second under-voltage threshold value;
activating the power supply in response to a deactivated under-voltage signal; and
deactivating the power supply in response to an activated under-voltage signal. - View Dependent Claims (44, 45, 46, 47, 48, 49, 50)
-
-
51. A method for controlling a power supply, comprising:
-
receiving a first current representative of an input voltage to the power supply through a first terminal of a power supply controller;
activating an over-voltage signal if the first current rises above a first over-voltage threshold value;
deactivating the over-voltage signal if the first current falls below a second over-voltage threshold value;
activating the power supply in response to a deactivated over-voltage signal; and
deactivating the power supply in response to an activated over-voltage signal. - View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 60, 61, 62, 63)
-
-
59. A method for controlling a power supply, comprising:
-
receiving a first current representative of an input voltage to the power supply through a first terminal of a power supply controller;
switching a second current flowing through the primary winding with a switching waveform having a duty cycle;
adjusting the duty cycle of the switching waveform in response to the first current.
-
-
64. A method for controlling a power supply, comprising:
-
supplying a first current from a first terminal of a power supply controller;
deactivating the power supply if the first current supplied from the first terminal falls below a first threshold value; and
activating the power supply if the first current supplied from the first terminal rises above a second threshold value. - View Dependent Claims (65, 66, 67, 68, 69, 70, 71, 72)
-
-
73. A method for controlling a power supply, comprising:
-
supplying a first current from a first terminal of a power supply controller;
controlling a second current flowing through a primary winding of the power supply with a power switch coupled to the primary winding; and
adjusting a current limit of the second current in response to the first current. - View Dependent Claims (74, 75, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87)
-
-
79. A power supply controller, comprising:
-
a power switch having a drain terminal, a source terminal and a gate, the drain terminal coupled to a primary winding of a power supply and the source terminal coupled to ground;
a control circuit coupled to a control terminal, the drain terminal and the gate of the power switch, the control terminal coupled to an output of the power supply, the control circuit to generate a switching waveform to control the power switch;
multi-function circuitry coupled between a multi-function terminal and the control circuit, the switching waveform generated in response to the drain terminal, the control terminal and the multi-function terminal.
-
-
88. A method for controlling a power supply, comprising:
-
generating a switching waveform to control a power switch of a power supply controller coupled to a primary winding of the power supply;
adjusting the switching waveform in response to a drain terminal of the power supply controller coupled to the primary winding, a voltage at the drain terminal indicating a current flowing through the power switch;
adjusting the switching waveform in response to a control terminal of the power supply controller coupled to an output of the power supply; and
adjusting the switching waveform in response to a current flowing through a multi-function terminal of the power supply controller. - View Dependent Claims (89, 90, 91, 92, 93, 94, 95, 96, 97, 98)
-
-
99. The power supply controller, comprising:
-
a power switch coupled between a drain terminal and a source terminal, the drain terminal to be coupled to a primary winding of a power supply;
a control circuit coupled to the power switch, the drain terminal and a control terminal, the control terminal to be coupled to an output of the power supply;
a negative current sensor coupled to a multi-function terminal;
a positive current sensor coupled to the multi-function terminal;
a on/off circuit coupled between the negative current sensor and the control circuit;
an external current limit adjuster coupled between the negative current sensor and the control circuit;
an under-voltage comparator coupled between the positive current sensor and the control circuit;
an over-voltage comparator coupled between the positive current sensor and the control circuit; and
a maximum duty cycle adjuster coupled between the positive current sensor and the control circuit. - View Dependent Claims (100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112)
-
Specification