Darlington amplifier with excess current protection

Details Darlington amplifier with excess current protection Darlington amplifier with excess current protection

H - Electricity

02

H

330/2

H02H 7/20 (2006.01) H03F 1/52 (2006.01)

Patent

CA 1152585

PHF. 79.578 16 ~BSTRACTs A Darllngton ampll~ier with an lnput tran~lstox and an outpu~ transstor compr~ses an auxlliary transistor for overload protect~on. ~he colle¢tor and emi~ter of tha auxlliary transi~tor are coupled to the ba~e o *he lnput transistor and the emltter of ~he output tran~istor respectiv~ly. $he base of the auxlli ry transi~tor 1~ con- nected to a tapping provid~d on a Darllngton resi tor included between the em~tter and the base of the output transi~tor. A ~lmpl~fied protect~on circult, not requirlng addltional re~istors, is obtained in thls way by using the Darllngton re~lstor, ~hich consl3t~ ln bia~ing said auxl- l~ary transl~tor. This i8 particularly useful ~or power ampliflers formed as a monolithic integrated cir¢uit de~ice.

362568

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