G - Physics – 05 – F
Patent
G - Physics
05
F
G05F 1/46 (2006.01) H03F 1/52 (2006.01) H03K 17/08 (2006.01) H03K 17/0812 (2006.01)
Patent
CA 2156923
A circuit and method for protecting a transistor during operation above the transistor's BVCEO by limiting the reverse base current. The reverse base current is used to adjust the applied base-emitter voltage. Limiting the reverse base current keeps the collector and emitter currents within safe limits and thus extends the safe operating area of the transistor. The invention finds application as an overvoltage sensor and transistor protector circuit and is particularly application to implementation in an integrated circuit. The circuit may be combined with circuits for the protection of a transistor against excessive current and temperature in a high voltage linear regulator.
Harris Corporation
Oldham Edward H.
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