摘要:
Peak current in a switching converter is controlled using a closed loop to compensate for error caused by delay time in the switching transistor and control logic. A reference value is established that represents a target current value. A compensated reference value is derived from the reference value by the closed loop. A periodic inductor current is formed in the switching converter in response to the compensated reference value. An error signal is formed that is indicative of an amount of time the inductor current exceeds the target current value. The compensated reference value is dynamically adjusted by the compensation closed loop to minimize the error signal.
摘要:
A DC-DC converter including: a switch, having a control terminal receiving a control signal, and a conduction terminal supplying a current; a load, coupled to the conduction terminal of the switch and selectively receiving the current; a control circuit, receiving a clock signal and generating the control signal in synchronism with the clock signal; an overcurrent sensor, coupled to the switch so as to monitor an electrical quantity correlated to the current and to output a protection signal in presence of overcurrent; moreover including overcurrent-protection circuitry, receiving the protection signal and the clock signal and generating a disabling signal for the control circuit if delay between an overcurrent detection and the clock signal is shorter than a detection time.
摘要:
A switching power supply circuit is provided for capacitor charging, wherein a power device is coupled to a terminal node of a capacitor to be charged and has a control terminal coupled to the output of an associated drive circuit. This circuit includes a second power element being associated with the first power device, coupled to said terminal node, and provided with a control terminal which is connected directly to the output of respective drive logic. The second power element is driven to turn on when a voltage below a predetermined minimum is present at the capacitor, thereby pulling the voltage at the terminal node to ground and further charging the capacitor.
摘要:
An electronic device having first and second external pins; first and second pads connected to the first external pin by respective bonding wires; and third and fourth pads connected to the second external pin respective bonding wires, and to a first common line by respective resistors. By means of a circuit configuration of this type, the intactness of the bonding wires can easily be checked by carrying out a simple resistance measurement between the first and the second external pin.
摘要:
The protection circuit includes a reference voltage source and at least one circuit which are connected together via a switch. A memory element is connected to the input of the circuit, downstream of the switch. The switch is temporarily opened by a control signal generated by a monostable circuit when detecting switching of power elements belonging to an electronic device embedding the protection circuit. When the switch is open, the memory element supplies the circuit with the reference voltage previously stored. In this way, switching of the power element that might cause noise on the reference voltage cannot disturb the circuit and thereby cannot cause a faulty operation of the latter.
摘要:
A voltage regulator circuit produces a voltage reference with high line rejection even for low values of the supply voltage. The regulator is of the type that produces a regulated voltage value for a bandgap voltage generator and includes a regulation circuit portion and a reference circuit portion. The regulation circuit portions is supplied with the supply voltage and has an output at which the regulated voltage value is produced and an input that receives a voltage reference. The reference circuit portion produces the voltage reference and includes a first circuit leg that receives the supply voltage through a controlled switch and a second circuit leg that receives the regulated voltage value.
摘要:
An electronic device smoothes a charge current peak in RLC output stages of switching step-up regulators, which stages include an input terminal and an output terminal with an inductance and a parasitic resistance in series therebetween, the latter corresponding to the series parasitic resistance of the inductance, and a capacitor connected between the output terminal and a ground. The device comprises a parallel of a resistor and a controlled switch connected between the inductance and the output terminal of the stage upstream of the capacitor. Advantageously, the switch would only be open during the charge transient of the capacitor.
摘要:
Peak current in a switching converter is controlled using a closed loop to compensate for error caused by delay time in the switching transistor and control logic. A reference value is established that represents a target current value. A compensated reference value is derived from the reference value by the closed loop. A periodic inductor current is formed in the switching converter in response to the compensated reference value. An error signal is formed that is indicative of an amount of time the inductor current exceeds the target current value. The compensated reference value is dynamically adjusted by the compensation closed loop to minimize the error signal.
摘要:
A device and method for driving a converter circuit that supplies a charge via a first electronic switch and a second electronic switch alternately turned on and off. A generator module generates a memory signal, indicating the duration of a first dead-time interval. A delay module, sensitive to the memory signal controls turning-on of the first electronic switch with a delay, with respect to turning-off of the second electronic switch, so that a second dead-time interval has a duration substantially equal to the duration of the first dead-time interval.
摘要:
The method of a protection circuit includes a reference voltage source and at least one circuit which are connected together via a switch. A memory element is connected to the input of the circuit, downstream of the switch. The switch is temporarily opened by a control signal generated by a monostable circuit when detecting switching of power elements belonging to an electronic device embedding the protection circuit. When the switch is open, the memory element supplies the circuit with the reference voltage previously stored. In this way, switching of the power element that might cause noise on the reference voltage cannot disturb the circuit and thereby cannot cause a faulty operation of the latter.