Enable and disable of diode emulation in a DC/DC converter
First Claim
1. A method of enabling and disabling diode emulation in a DC/DC converter which generates an output voltage, comprising:
- detecting a diode emulation request signal indicative of enabling or disabling diode emulation; and
delaying enabling or disabling diode emulation until after the output voltage begins changing.
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Accused Products
Abstract
A method of enabling and disabling diode emulation for a DC/DC converter which generates an output voltage including detecting a diode emulation request signal indicative of enabling or disabling diode emulation and delaying enabling or disabling diode emulation until after the output voltage begins changing. Diode emulation is enabled while the output voltage is decreasing or has reached a predetermined level and an optional delay may be included. Diode emulation is disabled while the voltage is increasing. A diode emulation control circuit includes a first circuit that determines when the output voltage is changing and a second circuit that selectively enables or disables diode emulation in response to a diode emulation enable/disable signal after the output voltage begins to change.
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Citations
23 Claims
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1. A method of enabling and disabling diode emulation in a DC/DC converter which generates an output voltage, comprising:
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detecting a diode emulation request signal indicative of enabling or disabling diode emulation; and
delaying enabling or disabling diode emulation until after the output voltage begins changing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A diode emulation control circuit for a DC/DC converter which provides an output voltage, comprising:
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a first circuit that determines when the output voltage is changing; and
a second circuit, coupled to said first circuit, that selectively enables or disables diode emulation in response to a diode emulation enable/disable signal after the output voltage begins to change. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A DC/DC converter for a microprocessor, the microprocessor providing a voltage identification (VID) signal indicative of a desired supply voltage and providing a diode emulation request (SLP) signal coincident with said voltage identification signal, said DC/DC converter comprising:
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a switching circuit that switches an input voltage through an output inductor to provide a supply voltage for the microprocessor in accordance with a pulse width modulation (PWM) signal, said switching circuit having a diode emulation mode of operation; and
control logic, coupled to said switching circuit, that receives the VID and SLP signals, that provides said PWM signal, and that includes a diode emulation control circuit for selectively enabling or disabling said diode emulation mode of operation of said switching circuit after said supply voltage begins changing. - View Dependent Claims (20, 22, 23)
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21. The DC/DC converter of claim 209, wherein said comparator circuit comprises:
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a digital to analog converter (DAC) that converts said VID signal to an analog voltage signal;
a slew rate controller that generates a soft control signal based on said analog voltage signal; and
a comparator that determines when said soft control signal decreases to within a predetermined voltage offset of said analog voltage signal.
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Specification