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US 2024/0405756 A1Published application
Desaturation circuit having temperature compensation
AssigneeAllegro MicroSystems, LLC
InventorsJohn Horan, Paddy Collins
Life of this patent
Estimating the term…
Abstract
Methods and apparatus for a desaturation circuit having a temperature compensated voltage threshold for protecting a power transistor, such as a FET. A comparator module has a first input to a voltage source associated with current through the FET and a second input coupled to the voltage threshold circuit. As a resistance of the FET changes due to temperature changes, the voltage threshold changes to compensate for the resistance change of the FET.
Claims26
A system, comprising:
- a desaturation circuit configured to generate a temperature-compensated voltage desaturation threshold voltage for a transistor, wherein the desaturation circuit comprises:
- a proportional to absolute temperature (PTAT) circuit having a bandgap circuit, wherein the PTAT circuit has an output;
- a complementary to absolute temperature (CTAT) circuit having an output;
- and
- a combiner circuit to combine the output of the CTAT circuit and the output of the PTAT circuit to generate the temperature-compensated voltage desaturation threshold voltage.
2 more elements
A method, comprising:
- configuring a desaturation circuit to generate a temperature-compensated voltage desaturation threshold voltage for a transistor, wherein the desaturation circuit comprises:
- a proportional to absolute temperature (PTAT) circuit having a bandgap circuit, wherein the PTAT circuit has an output;
- a complementary to absolute temperature (CTAT) circuit having an output;
- and
- a combiner circuit to combine the output of the CTAT circuit and the output of the PTAT circuit to generate the temperature-compensated voltage desaturation threshold voltage.
2 more elements
Dependencies are inferred from the claim text.