Circuit and method for extending the safe operating area of a BJ

Details Circuit and method for extending the safe operating area of a BJ Circuit and method for extending the safe operating area of a BJ

1993-02-26

1994-10-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

330289, 330296, 330207P, H03F 304

Patent

active

053570898

ABSTRACT:
A circuit and method for protecting a transistor during operation transistor's BV.sub.CEO 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 applicable 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.

REFERENCES:
patent: 2864904 (1958-12-01), Jensen
patent: 4090227 (1978-05-01), Schweitzer
patent: 4092613 (1978-05-01), Boubouleix
patent: 4612451 (1986-09-01), Maekawa et al.

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