US 2025/0373000 A1 · ELECTRICAL FUSE CONTROL CIRCUIT

Abstract

A described example includes a circuit. The circuit can include a current sense circuit having a sense input and a sense output, in which the sense input is coupled to an input terminal. A comparator has a first comparator input, a second comparator input, and a comparator output, in which the first comparator input is coupled to the sense output, the second comparator input is coupled to a threshold terminal, and the comparator output is coupled to a fuse terminal. A current programming circuit has a current input and a current output, in which the current input is coupled to the sense output. A first circuit is coupled between the sense output and a ground terminal. A second circuit is coupled between the current output and the ground terminal.

Claims20

Dependent claims

A circuit, comprising:

a current sense circuit having a sense input and a sense output, in which the sense input is coupled to an input terminal;
a comparator having a first comparator input, a second comparator input, and a comparator output, in which the first comparator input is coupled to the sense output, the second comparator input is coupled to a threshold terminal, and the comparator output is coupled to a fuse terminal;
a current programming circuit having a current input and a current output, in which the current input is coupled to the sense output;
a first circuit coupled between the sense output and a ground terminal;
and
a second circuit coupled between the current output and the ground terminal.

3 more elements

A circuit, comprising:

a current sense circuit configured to provide a first current signal representative of a square of a load current;
a nominal current programming circuit configured to provide a second current signal representative of a square of a nominal current for a simulated fuse, in which the current programming circuit is configured to set the square of the nominal current;
a time-current circuit configured to provide a voltage based on the first current signal and the second current signal, in which the time-current circuit has an electrical characteristic representative of a current squared times time (I2t) rating for the simulated fuse based on the first current signal and the second current signal;
and
a comparator configured to provide a comparator output signal, defining a fault condition, based on a voltage across the time-current circuit relative to a threshold voltage.

2 more elements

A system, comprising:

a switch, defining a fuse, including a first current terminal, a second current terminal, and a control terminal, in which the first current terminal is coupled to a supply voltage terminal, and the second current terminal is coupled to a load terminal, and the supply voltage terminal and the load terminal are in a power path;
a fuse control circuit, comprising:
a current sense circuit including a sense input and a sense output, in which the sense input is coupled to one of the first current terminal or the second current terminal;
a multiplier circuit including a multiplier input and a multiplier output, in which the multiplier input is coupled to the sense output;
a comparator circuit including a first comparator input, a second comparator input, and a comparator output, in which the first comparator input is coupled to the multiplier output, the second comparator input is coupled to a threshold terminal, and the comparator output is coupled to the control terminal of the switch;
a current programming circuit including a current input and a current output, in which the current input is coupled to the multiplier output;
and
a capacitor coupled between the multiplier output and a ground terminal.

5 more elements

Dependencies are inferred from the claim text.

Electrical fuse control circuit

Life of this patent

Electrical fuse control circuit

Life of this patent

Abstract

Claims20