Monolithically integrated output stage
AssigneeRobert Bosch GmbH
InventorManfred Uebele
Life of this patent
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Abstract
A monolithically integrated output stage includes an arrangement for detecting the load current through a power switching transistor and/or an arrangement for detecting the output voltage at a power switching transistor and/or an arrangement for detecting the chip temperature. A switching logic of the monolithically integrated output stage includes at least one output transistor for switching the output transistor on reaching at least one predetermined load current threshold and/or output voltage threshold and/or temperature threshold, where the output transistor supplies a high signal at at least one logic output. The emitter of the output transistor is coupled to the logic output, and a switching device is provided to block the output transistor at a negative collector voltage of the power switching transistor.
Claims5
A monolithically integrated output stage, comprising:
- a power switching transistor;
- a detection device coupled to the power switching transistor including at least one of:
- an arrangement detecting a current related parameter of the power switching transistor;
- a switching logic element coupled to the power switching transistor and including an output transistor, the switching logic element switching the output transistor when a predetermined current related threshold has been reached with respect to the power switching transistor;
- a logic output coupled to an emitter of the output transistor, the output transistor supplying a high signal to the logic output when the predetermined current related threshold has been reached with respect to the power switching transistor;
- and
- a switching device coupled to the output transistor, the switching device blocking a conduction of the output transistor in response to a negative collector voltage appearing at the power switching transistor.
Dependencies are inferred from the claim text.