Abstract: A temperature detection device which receives a temperature signal from a temperature sensor and outputs an electrical signal corresponding to the temperature signal. A temperature slope which is an amount of change in an output of the electric signal relative to an amount of change in the temperature signal is changed at a predetermined temperature threshold.

Abstract: There is provided a drive circuit for turning on/off a power element which controls a main current flow between a first main electrode and a second main electrode in response to a drive signal applied to a control electrode. The drive circuit includes first and second semiconductor switch elements which are connected in series and interposed between a power supply terminal and a ground terminal, a series connection point thereof being connected to the control electrode, third and fourth semiconductor switch elements which are connected in series and interposed between the power supply terminal and the ground terminal, a series connection point thereof being connected to the second main electrode, and a control circuit which controls turn-on/off of the power element by turning on/off the first to fourth semiconductor switch elements. The first semiconductor switch element has a larger on-resistance than the second to fourth semiconductor switch elements.

Abstract: A device including: a transistor having a collector-emitter junction connected in series or parallel to a current detection resistance for detecting current that flows through a current sensing terminal of a switching element; and an overshoot processing circuit connected between the current sensing terminal and a base of the transistor, which reduces overshoot of sense current flowing through the current detection resistance, the overshoot is caused by switching operation of the switching element, by controlling the transistor depending on current input from the current sensing terminal, is provided.

Abstract: A temperature detection device which receives a temperature signal from a temperature sensor and outputs an electrical signal corresponding to the temperature signal. A temperature slope which is an amount of change in an output of the electric signal relative to an amount of change in the temperature signal is changed at a predetermined temperature threshold.

Abstract: A device including: a transistor having a collector-emitter junction connected in series or parallel to a current detection resistance for detecting current that flows through a current sensing terminal of a switching element; and an overshoot processing circuit connected between the current sensing terminal and a base of the transistor, which reduces overshoot of sense current flowing through the current detection resistance, the overshoot is caused by switching operation of the switching element, by controlling the transistor depending on current input from the current sensing terminal, is provided.

Abstract: There is provided a drive circuit for turning on/off a power element which controls a main current flow between a first main electrode and a second main electrode in response to a drive signal applied to a control electrode. The drive circuit includes a a first semiconductor switching element and a second semiconductor switching element which are connected in series with a semiconductor element and provided between the power supply terminal and the ground terminal, third semiconductor switching element and a fourth semiconductor switching element which are connected in series, and a control circuit which controls turn-on/off of the power element by turning on/off the first to fourth semiconductor switching elements. The semiconductor element has a positive temperature characteristic.

Abstract: There is provided a drive circuit for turning on/off a power element which controls a main current flow between a first main electrode and a second main electrode in response to a drive signal applied to a control electrode. The drive circuit includes a first semiconductor switching element and a second semiconductor switching element which are connected in series and provided between the power supply terminal and the ground terminal, a third semiconductor switching element and a fourth semiconductor switching element which are connected in series with a semiconductor element, and a control circuit which controls turn-on/off of the power element by turning on/off the first to fourth semiconductor switching elements. The semiconductor element has a negative temperature characteristic.

Abstract: There is provided a drive circuit for turning on/off a power element which controls a main current flow between a first main electrode and a second main electrode in response to a drive signal applied to a control electrode. The drive circuit includes a a first semiconductor switching element and a second semiconductor switching element which are connected in series with a semiconductor element and provided between the power supply terminal and the ground terminal, third semiconductor switching element and a fourth semiconductor switching element which are connected in series, and a control circuit which controls turn-on/off of the power element by turning on/off the first to fourth semiconductor switching elements. The semiconductor element has a positive temperature characteristic.

Abstract: There is provided a drive circuit for turning on/off a power element which controls a main current flow between a first main electrode and a second main electrode in response to a drive signal applied to a control electrode. The drive circuit includes a first semiconductor switching element and a second semiconductor switching element which are connected in series and provided between the power supply terminal and the ground terminal, a third semiconductor switching element and a fourth semiconductor switching element which are connected in series with a semiconductor element, and a control circuit which controls turn-on/off of the power element by turning on/off the first to fourth semiconductor switching elements. The semiconductor element has a negative temperature characteristic.

Abstract: There is provided a drive circuit for turning on/off a power element which controls a main current flow between a first main electrode and a second main electrode in response to a drive signal applied to a control electrode. The drive circuit includes first and second semiconductor switch elements which are connected in series and interposed between a power supply terminal and a ground terminal, a series connection point thereof being connected to the control electrode, third and fourth semiconductor switch elements which are connected in series and interposed between the power supply terminal and the ground terminal, a series connection point thereof being connected to the second main electrode, and a control circuit which controls turn-on/off of the power element by turning on/off the first to fourth semiconductor switch elements. The first semiconductor switch element has a larger on-resistance than the second to fourth semiconductor switch elements.

Abstract: In a semiconductor device, a high-side potential determination circuit outputs an event signal when a high-side reference potential detected by a high-side potential detection circuit rises. If at that time an input logic signal for controlling a high side is at a low (L) level, a pulse generation circuit regenerates a reset signal for a high-side drive circuit. When the input logic signal for controlling the high side is at the L level and the event signal is inputted, an overcurrent detection determination circuit makes an overcurrent detection signal from an overcurrent detection circuit invalid. When the event signal is not inputted, the overcurrent detection determination circuit makes the overcurrent detection signal valid.

Abstract: A drive control circuit for a switching power supply device. The drive control circuit includes an output control circuit configured to generate an output control signal with a pulse width corresponding to an output voltage of the switching power supply device, a threshold setting circuit configured to determine a winding threshold voltage according to a direct current input voltage applied to the series resonant circuit formed of the leakage inductance of an isolation transformer and a capacitor of the switching power supply device, a winding detection circuit configured to compare a voltage generated in a tertiary winding of the isolation transformer with the winding threshold voltage and to accordingly output a winding detection signal, and a drive circuit configured to receive the winding detection signal and the output control signal, and to generate a pulse-width controlled drive signal for driving a first switching element of the switching power supply device.

Abstract: In a semiconductor device, a high-side potential determination circuit outputs an event signal when a high-side reference potential detected by a high-side potential detection circuit rises. If at that time an input logic signal for controlling a high side is at a low (L) level, a pulse generation circuit regenerates a reset signal for a high-side drive circuit. When the input logic signal for controlling the high side is at the L level and the event signal is inputted, an overcurrent detection determination circuit makes an overcurrent detection signal from an overcurrent detection circuit invalid. When the event signal is not inputted, the overcurrent detection determination circuit makes the overcurrent detection signal valid.

Abstract: A power device drive circuit reduces the short-circuit resistance of a power device that switches an input voltage. The power device drive circuit includes an output amplifier that applies a control voltage to a control terminal of the power device so as to be turned on and off, and an internal power supply circuit that generates a drive voltage of the output amplifier in accordance with a change in the input voltage, thereby causing the control voltage to change. In particular, the internal power supply circuit reduces the drive voltage of the output amplifier when the input voltage rises, thereby reducing the short-circuit current of the power device.

Abstract: A power device drive circuit reduces the short-circuit resistance of a power device that switches an input voltage. The power device drive circuit includes an output amplifier that applies a control voltage to a control terminal of the power device so as to be turned on and off, and an internal power supply circuit that generates a drive voltage of the output amplifier in accordance with a change in the input voltage, thereby causing the control voltage to change. In particular, the internal power supply circuit reduces the drive voltage of the output amplifier when the input voltage rises, thereby reducing the short-circuit current of the power device.

Abstract: A switching power supply apparatus includes: a dead time circuit that receives an output control signal and generates dead time signal to specify a time width when both first and second switching elements are turned OFF; an output signal generation circuit that generates first and second output signals which specify the ON time of the first and second switching elements respectively in accordance with the output control signal and the dead time signal; and a dead time adjustment circuit that adjusts the turn ON timings of the first and second switching elements by changing the time width of the dead time signal in accordance with the change of voltage of the DC input power or the change of the output voltage of the capacitor.

Abstract: Malfunction can be reliably avoided even when a signal that drives a high side power device is not normally transmitted in a level shift circuit. In a drive circuit, a pulse generator circuit generates a set signal and reset signal that causes a high side power device to be turned on or off. The pulse generator circuit provides set and reset signals, via a level shift circuit, to a high side drive circuit. A high side potential (a high side reference potential or a high side power supply potential) is detected by a high side potential detector circuit. A high side potential determination circuit determines a change in potential that impedes the transmission of the set signal or reset signal in the level shift circuit, and causes the pulse generator circuit to regenerate the set signal or reset signal when the timing of the detection coincides with the timing at which the set signal or reset signal is generated.

Abstract: A drive control circuit for a switching power supply device. The drive control circuit includes an output control circuit configured to generate an output control signal with a pulse width corresponding to an output voltage of the switching power supply device, a threshold setting circuit configured to determine a winding threshold voltage according to a direct current input voltage applied to the series resonant circuit formed of the leakage inductance of an isolation transformer and a capacitor of the switching power supply device, a winding detection circuit configured to compare a voltage generated in a tertiary winding of the isolation transformer with the winding threshold voltage and to accordingly output a winding detection signal, and a drive circuit configured to receive the winding detection signal and the output control signal, and to generate a pulse-width controlled drive signal for driving a first switching element of the switching power supply device.

Abstract: A drive control circuit for a switching power supply device. The drive control circuit includes an output control circuit configured to generate an output control signal with a pulse width corresponding to an output voltage of the switching power supply device, a threshold setting circuit configured to determine a winding threshold voltage according to a direct current input voltage applied to the series resonant circuit formed of the leakage inductance of an isolation transformer and a capacitor of the switching power supply device, a winding detection circuit configured to compare a voltage generated in a tertiary winding of the isolation transformer with the winding threshold voltage and to accordingly output a winding detection signal, and a drive circuit configured to receive the winding detection signal and the output control signal, and to generate a pulse-width controlled drive signal for driving a first switching element of the switching power supply device.

Abstract: A switching power supply device wherein an input voltage is stepped-up by first and second switching elements that are driven on and off in a complementary way, thus obtaining a stabilized output voltage. The switching power supply device includes a comparator that detects fluctuation in an operating reference potential of the second switching element accompanying fluctuation in the input voltage, and a drive signal generator circuit that carries out a logical operation on an output control signal, a dead time signal, and the output signal of the comparator, thus generating first and second drive signals that determine the on-state time of the first and second switching elements.