Voltage regulator with current-mode dual-edge width modulation and non-linear control
First Claim
1. A method of controlling a voltage regulator, the method comprising:
- using a first ramp signal to control turning ON of a top switch of a voltage regulator, the top switch of the voltage regulator being configured to couple a power supply supplying an input voltage to a load of the voltage regulator;
using a second ramp signal to control turning OFF of the top switch of the voltage regulator, the second ramp signal being out of phase with the first ramp signal;
detecting a step change of a load current drawn by the load from the voltage regulator; and
responding to the step change of the load current by using a non-linear control circuit to control the top switch of the voltage regulator.
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Accused Products
Abstract
A voltage regulator with current-mode, dual-edge pulse width modulation (PWM) and non-linear control. The voltage regulator may include a top switch (e.g., MOSFET) configured to couple a power supply supplying an input voltage to a load. A linear control circuit of the regulator may use a first ramp signal to control turning ON of the top switch and a second ramp signal to control turning OFF of the top switch. A non-linear control circuit may turn ON the top switch upon detection of a load current step-up change to maintain an output voltage of the regulator within its regulation band. The non-linear control circuit may turn OFF the top switch upon a load current step-down change to prevent output voltage overshoot.
77 Citations
20 Claims
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1. A method of controlling a voltage regulator, the method comprising:
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using a first ramp signal to control turning ON of a top switch of a voltage regulator, the top switch of the voltage regulator being configured to couple a power supply supplying an input voltage to a load of the voltage regulator; using a second ramp signal to control turning OFF of the top switch of the voltage regulator, the second ramp signal being out of phase with the first ramp signal; detecting a step change of a load current drawn by the load from the voltage regulator; and responding to the step change of the load current by using a non-linear control circuit to control the top switch of the voltage regulator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A voltage regulator comprising:
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a first switch and a second switch; a linear control circuit configured to control the first and second switches, the linear control circuit being configured to use a first ramp signal to control turning ON of the first switch and to use a second ramp signal to control turning OFF of the first switch, the first and second ramp signals being out of phase, the first and second switches being synchronously switched; and a non-linear control circuit configured to source current to a load upon occurrence of a step change of a load current drawn by the load. - View Dependent Claims (14, 15, 16)
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17. A method of controlling a voltage regulator, the method comprising:
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controlling switching of a pair of synchronously switched transistors using a first signal and a second signal of a linear control circuit, the first and second signals being out of phase; detecting a step change of a load current drawn by a load from the regulator; and responding to the step change of the load current by controlling switching of the pair of synchronously switched transistors using a non-linear control circuit. - View Dependent Claims (18, 19, 20)
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Specification