Texas Instruments Corporation

Manuel Wiersch

Gerhard Thiele

Antonio Priego

Johann Erich Bayer

Stefan Herzer

Eduardas Jodka

Ferdinand Stettner

Gaetano Maria Walter Petrina

A circuit for controlling a discharge transistor for a power stage includes a current mirror, a first diode, and a second diode. The current mirror includes first, second, third and fourth field-effect transistors (FETs) configured to provide a fast startup signal and a startup discharge signal. The startup discharge signal is provided to a gate of the discharge transistor. The first diode is configured to limit the fast startup signal to a first maximum voltage less than the supply voltage, and the second diode is configured to limit the startup discharge signal to a second maximum voltage less than the supply voltage.

Circuit and system for actively discharging a power stage input node during power supply turn-on

An electrical system includes: 1) a buck converter; 2) a battery coupled to an input of the buck converter; and 3) a load coupled to an output of the buck converter. The buck converter includes a high-side switch, a low-side switch, and regulation loop circuitry coupled to the high-side switch and the low-side switch. The regulation loop circuitry includes: 1) a main comparator; 2) a bias current source coupled to the main comparator and configured to provide a bias current to the main comparator; and 3) a dynamic biasing circuit coupled to the main comparator and configured to add a supplemental bias current to the bias current in 100% mode of the buck converter. The supplemental bias current varies depending on an input voltage (VIN) and an output voltage (VOUT) of the buck converter.

Dynamic biasing circuit for main comparator to improve load-transient and line-transient performance of buck converter in 100% mode

In some examples, an apparatus includes a driver having a driver output, a capacitor having a first plate and a second plate, the first plate coupled to the driver output, and a transistor having a transistor gate, a transistor source, and a transistor drain. The apparatus also includes a first switch coupled between the second plate and the transistor gate, a second switch coupled between the second plate and the transistor drain, and a third switch coupled between the transistor gate and the transistor drain.

Power converter control

A switching converter circuit includes a voltage regulation loop configured to provide an output voltage (VOUT) based on an input voltage (VIN). The switching converter circuit also includes a 100% mode circuitry coupled to the voltage regulation loop, wherein the 100% mode circuitry is configured to apply an offset to VOUT in response to detecting that VIN is approaching VOUT.

Low quiescent current buck converter with direct feedback

An electrical system includes: 1) a buck converter; 2) a battery coupled to an input of the buck converter; and 3) a load coupled to an output of the buck converter. The buck converter includes a high-side switch, a low-side switch, and regulation loop circuitry coupled to the high-side switch and the low-side switch. The regulation loop circuitry includes a comparator with preamplifier gain adjustment circuitry configured to adjust a preamplifier gain of the comparator based on an overdrive voltage.

Comparator with preamplifier gain adjustment based on overdrive voltage

An integrated circuit comprising: a high-side pMOSFET comprising a drain and a gate; a node coupled to the drain of the high-side pMOSFET; a voltage-to-current circuit comprising a first nMOSFET and a first resistor, the first nMOSFET comprising a gate and a source, the first resistor comprising a terminal coupled to the source of the first nMOSFET; an error amplifier comprising an output port coupled to the gate of the first nMOSFET; a skip clamp nMOSFET comprising a source coupled to the output port of the error amplifier; and a current limit clamp pMOSFET comprising a source coupled to the output port of the error amplifier.

Integrated circuits with current limit clamps and skip clamps for power converters

A device includes a first transistor coupled to a ground node and a current source. The first transistor includes a control terminal coupled to a reference voltage source, where the current source is coupled to an input voltage source. The device includes a second transistor coupled to the input voltage source, where the second transistor includes a control terminal coupled to the first transistor. The device includes a third transistor coupled to the second transistor, where the third transistor includes a control terminal coupled to an output voltage node. The device includes a fourth transistor coupled to the third transistor, where the fourth transistor includes a control terminal coupled to the output voltage node. The device includes a fifth transistor coupled to the fourth transistor and a resistor, where the fifth transistor includes a control terminal coupled to the fourth transistor. The resistor is coupled to the ground node.

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Freising, Germany

Manuel Wiersch