A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A circuit to isolate a first circuit node from second circuit node at certain times yet connect the first circuit node and second circuit node at other times. For example, the isolation circuit may isolate a reference node from a system ground during certain phases of operation, but temporarily connect the reference node to the system ground during other phases. An isolation circuit of this disclosure may include a pair of MOSFETs in a back-to-back connection. The MOSFETs may be placed between the two nodes to be isolated. The MOSFETS may be driven by a bipolar junction transistor (BJT). A control signal applied to the BJT emitter controls the operation of the pair of MOSFETs. The isolation or connection from the power supply reference node to system ground may be controlled by applying a HIGH or LOW logic signal to the PNP transistor emitter.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A signal transmission device for transmitting a pulse signal to drive a switching element includes: a first external terminal configured to receive a first input pulse signal for ordinary driving; a second external terminal configured to receive a second input pulse signal for forcible driving; and a first logic configured to generate a driving pulse signal according to the first and second input pulse signals. The first logic gives priority to the second input pulse signal over the first input pulse signal.

A circuit includes a first transistor comprising a first control input and first and second current terminals, the first control input coupled to receive a first input control signal, and the first current terminal coupled to a first power supply node. The circuit also includes a first resistor coupled to the first control input of the first transistor, a first capacitor coupled between the second current terminal of the first transistor and the first resistor and a second transistor comprising a second control input and third and fourth current terminals, the third current terminal coupled to the first resistor and to the first capacitor.

A signal transmission device for transmitting a pulse signal to drive a switching element includes: a first external terminal configured to receive a first input pulse signal for ordinary driving; a second external terminal configured to receive a second input pulse signal for forcible driving; and a first logic configured to generate a driving pulse signal according to the first and second input pulse signals. The first logic gives priority to the second input pulse signal over the first input pulse signal.

A signal transmission device is configured to transmit a pulse signal while isolating between a primary circuit system and secondary circuit system to drive a switching element. The signal transmission device includes: a first external terminal configured to receive a first input signal for driving a state of a driver output; a second external terminal configured to receive a second input signal for ASC operation; and a third external terminal configured to output the driver output and follow a logic level at the second external terminal.