Abstract: A circuit includes a fixed frequency controller, a constant on-time controller, a phase-frequency detector, and a voltage-to-current converter. The fixed frequency controller has a first control pulse output, and a clock output. The constant on-time controller has a second control pulse output, and a frequency control input. The phase-frequency detector has a first input coupled to the clock output, a second input coupled to the second control pulse output, and a phase control output. The voltage-to-current converter has a voltage input coupled to the phase control output, and a current output coupled to the frequency control input.

Abstract: A power converter includes a switch circuit having an input voltage terminal, an output voltage terminal, and a plurality of control inputs. The switch circuit includes a plurality of transistors. First and second capacitors have terminals coupled to the switch circuit. A control signal generator is coupled to the plurality of control inputs and is configured to sequence the plurality of transistors through first, second, third, fourth, fifth, and sixth control phases. In the first control phase, the first capacitor charges and the second capacitor discharges. In the second control phase, the first and second capacitors partially charge. In the third control phase, the second capacitor charges. In the fourth control phase, the first capacitor discharges and the second capacitor charges. In the fifth control phase, the first and second capacitors partially charge. In the sixth control phase, the first capacitor charges.

Abstract: In a voltage converter, a blocking transistor has a conduction path between a power terminal and a converter terminal. A body diode of the blocking transistor: conducts current from the power terminal to the converter terminal; and blocks current from the converter terminal to the power terminal. A first switching transistor has a conduction path between the converter terminal and a switching terminal. A second switching transistor has a conduction path between the switching terminal and a ground terminal. A first gate driver has an output coupled to a control terminal of the first switching transistor. A second gate driver has an output coupled to a control terminal of the second switching transistor. A driver circuit has an output coupled to a control terminal of the blocking transistor. A bootstrap terminal of the driver circuit is coupled to a bias input of the first gate driver.

Abstract: Systems, apparatus, articles of manufacture, and methods are disclosed to dynamically limit current for power converters. An example switch control circuitry configured to control a plurality of switches based on a loop voltage to control inductor current through a inductor; loop gain circuitry configured to generate the loop voltage based on an input voltage and a reference voltage; and clamping circuitry configured to clamp the loop voltage after the loop voltage exceeds a threshold, the switch control circuitry configured to clamp the inductor current based on the clamping of the loop voltage, wherein the clamping of the inductor current clamps an input current.

Abstract: A circuit includes a single-ended amplifier having first and second transistors and an amplifier output. The first transistor has a first control input and first and second current terminals. The second transistor has a second control input and third and fourth current terminals. The first and third current terminals are coupled to an adaptively regulated voltage terminal. The circuit also includes a chopper circuit coupled to the amplifier output and to the first and second transistors. A voltage tracking circuit has a voltage tracking circuit input and a voltage tracking circuit output. The voltage tracking circuit input is coupled to the amplifier output, and the voltage tracking circuit output is coupled to the adaptively regulated voltage terminal. The voltage tracking circuit is configured to adaptively vary a voltage on the regulated voltage terminal based on the amplifier output.

Abstract: In a voltage converter, a blocking transistor has a conduction path between a power terminal and a converter terminal. A body diode of the blocking transistor: conducts current from the power terminal to the converter terminal; and blocks current from the converter terminal to the power terminal. A first switching transistor has a conduction path between the converter terminal and a switching terminal. A second switching transistor has a conduction path between the switching terminal and a ground terminal. A first gate driver has an output coupled to a control terminal of the first switching transistor. A second gate driver has an output coupled to a control terminal of the second switching transistor. A driver circuit has an output coupled to a control terminal of the blocking transistor. A bootstrap terminal of the driver circuit is coupled to a bias input of the first gate driver.

Abstract: A master cylinder assembly includes a cylinder body, a piston member operably fitted therein, and a pressure valve assembly to establish a variable fluid output upon operation of the piston member. The cylinder body includes two or more pressure chambers to hold hydraulic fluid, each having a transfer port. The piston member includes two or more pistons respectively received in the pressure chambers, and is operable to move the pistons, in parallel, to transfer hydraulic fluid through the transfer ports. The pressure valve assembly includes a selector and is operable to direct fluid transferred through selected transfer ports out of the cylinder body through an outlet port by means of a movable valve member that establishes a passageway communicating the selected transfer ports with the outlet port. A pivot adjustment mechanism allows adjustment of the lever's mechanical advantage, and a stroke adjustment mechanism allows adjustment of the lever's rest position.

Abstract: A master cylinder assembly includes a cylinder body, a piston member operably fitted therein, and a pressure valve assembly to establish a variable fluid output upon operation of the piston member. The cylinder body includes two or more pressure chambers to hold hydraulic fluid, each having a transfer port. The piston member includes two or more pistons respectively received in the pressure chambers, and is operable to move the pistons, in parallel, to transfer hydraulic fluid through the transfer ports. The pressure valve assembly includes a selector and is operable to direct fluid transferred through selected transfer ports out of the cylinder body through an outlet port by means of a movable valve member that establishes a passageway communicating the selected transfer ports with the outlet port. A pivot adjustment mechanism allows adjustment of the lever's mechanical advantage, and a stroke adjustment mechanism allows adjustment of the lever's rest position.

Abstract: An amplifier apparatus includes: (a) an integrator having an input for receiving an input signal, and integrating the input signal to present an integrated signal; (b) a first comparer coupled with the integrator for comparing the integrated signal with a varying reference signal to produce an output signal; and (c) a feedback circuit, coupled to receive the integrated signal and coupled with the input structure, that includes: (1) a second comparer coupled for receiving the integrated signal and comparing the integrated signal with a reference level related to the reference signal; the second comparer presents an actuating signal when the integrated signal has a predetermined relationship with the reference level; and (2) a switch coupled with the second comparer unit and with the input and responding to the actuating signal to affect the input signal appropriately to reduce the integrated signal when the actuating signal is at a predetermined level.

Abstract: An audio preamplifier (10) based on an operational transconductance amplifier, in combination with a class D audio output amplifier (12) is disclosed. The input signal is coupled to the preamplifier (10) through a capacitor (14) in series with a resistor (17) that sets the transconductance of the preamplifier. The preamplifier (10) includes a differential operational amplifier (20) that drives output MOS transistors (22a, 22b), which are biased by current sources (24a, 26a; 24b, 26b). Feedback from the drain nodes of the output MOS transistors (22a, 22b) to the inputs of the differential operational amplifier (20), along with the series capacitor (14) and resistor (17) input coupling, ensures minimum offset voltage and current at the output of the preamplifier (10). Common mode feedback control amplifiers (25, 29) ensure proper bias of the components into the saturation region.