US 5,687,051 AGranted

Feedback circuit for protecting an integrated circuit with a delay time

AssigneeSamsung Electronics Co., Ltd.

InventorsHwan-ho Seong, Sang-hoon Jeong

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Abstract

Circuitry is provided which includes a control circuit formed on an integrated circuit. The control circuit controls an operation of a device. The circuitry further includes a feedback circuit and a protection circuit. The feedback circuit includes a first current source for outputting a small current and a second current source for outputting a larger current. A rectifier is connected between an output of the first and second current sources in order to prevent current from flowing from the output of the first current source toward the output of the second current source. A first voltage regulator is connected between an output of the second current source and ground, while a second voltage regulator is connected between the output of the first current source and an input of the protection circuit. A feedback capacitor is connected in parallel with a feedback current sink, between the output of the first current source and ground. The feedback capacitor serves to both activate the protection circuit 300 after a predetermined delay time has elapsed and to time when that predetermined delay time has elapsed.

Claims13

Dependent claims

Circuitry comprising a control circuit formed on an integrated circuit, a feedback circuit, and a protection circuit, said control circuit controlling an operation of a device, said feedback circuit comprising:

a first current source for outputting a first current to a first output;
a second current source for outputting a second current to a second output, having a current value significantly larger than said first current;
a rectifier having a rectifier cathode connected to said first output and a rectifier anode connected to said second output;
a first voltage regulator having a first regulator cathode connected to said second output and a first regulator anode connected to ground, said first voltage regulator preventing a voltage higher than a first threshold voltage from being formed at said second output;
a second voltage regulator having a second regulator cathode connected to said first output and a second regulator anode connected to an input of said protection circuit, and preventing a voltage higher than a second voltage threshold from being formed across said second voltage regulator, said second voltage threshold being higher than said first voltage threshold;
said protection circuit comprising means for outputting a control signal which protects said integrated circuit upon the occurrence of a transient state or system error being encountered by said integrated circuit;
and
a feedback capacitor connected between ground and said rectifier cathode.

5 more elements

Dependencies are inferred from the claim text.