Optimized power output clamping structure

Details Optimized power output clamping structure Optimized power output clamping structure

1996-10-29

1998-09-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327318, 327328, H03K 508

Patent

active

058120068

ABSTRACT:
An optimized power output clamping structure, includes a power output transistor having a first breakdown voltage and a breakdown structure having a second breakdown voltage coupled to the power output transistor. The second breakdown voltage is less than the first breakdown voltage and follows the first breakdown voltage across all temperature and semiconductor process variations. This feature allows a reduction in breakdown voltage guardbanding and increases output structure reliability. A method of protecting a circuit from inductive flyback is also disclosed. The method includes the steps of driving an inductive load with drive circuitry, turning off the inductive load, and clamping an inductive voltage at a voltage magnitude that protects the drive circuitry from breakdown across all temperature and processing variations.

REFERENCES:
patent: 5001373 (1991-03-01), Bator et al.
patent: 5028811 (1991-07-01), Le Roux et al.
patent: 5347169 (1994-09-01), Preslar et al.
patent: 5523714 (1996-06-01), Topp et al.

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