The CA consists of five general-purpose silicon NPN transistors on a common monolithic substrate. Two of the transistors are internally. CA TH intersir. Data Sheet. December 15, FN General Purpose NPN Transistor Array. The CA consists of five general-purpose silicon. The CA consists of five general-purpose silicon NPN transistors on a common monolithic substrate. Two of the Datasheet, Download CA datasheet.
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General Purpose NPN Transistor Array, CA datasheet, CA circuit, CA data sheet: INTERSIL, alldatasheet, datasheet, Datasheet search site for. Part Number: CA, Intersil, File Type: PDF, Document: CA PDF General Purpose NPN Transistor Array, Datasheet pdf search site for electronic. CA from Intersil Corporation. Find the PDF Datasheet, Specifications and Distributor Information.
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CA- Datasheet. Thus, to simplify the immediately following description, the quiescent current in R7 will be ignored even though it is supplied from the emitter of T2.
Since the emitter currents of T1 and T2 are in selected ratio, the potential across R1 is substantially the same as that across R2. That sum is about 1.
CA3086 - General Purpose NPN Transistor Array
As a result, the summed voltage can have substantially zero temperature coefficient. A degenerative negative feedback connection is employed to maintain the potential between terminals 12 and 14 at VBG by conducting current therebetween, primarily in the collector-emitter path of NPN transistor T5. NPN transistors T3 and T4 are cascade-connected common-emitter amplifiers including collector resistors R4 and R5, respectively.
If VBG were assumed to increase, then the voltage at T2 collector increases causing T3 to conduct more heavily.
CA3086 - General Purpose NPN Transistor Array
That, in turn, reduces the collector voltage of T3 causing T4 to conduct less heavily, thus increasing its collector voltage and causing T5 to conduct more heavily.
Opposite changes occur to return VBG if it were assumed to have decreased. Capacitor C stabilizes the degenerative feedback loop against undesirable oscillations. The degree to which the shunt regulation feedback just described corrects changes in VBG depends upon the magnitude of the gain of T3, T4 and T5.
Since that gain is finite in practical circuits, a finite change in VBG results from any given change in current flowing in regulator As a result, regulator 10 exhibits an apparent non-zero resistance. To reduce this resistance, a regenerative positive feedback connection responds to the current flow in T5.
Resistor R6, of relatively small value compared to R3 or R7, develops a voltage proportional to the emitter current of T5. That decreases the current flow in R7 which decreases the current supplied from the emitter of T2.
That decrease reduces the voltage across R2 which increases the T2 collector voltage. As described above, that increase is coupled by T3 and T4 to cause T5 to conduct slightly more heavily thereby to further reduce VBG. The values of R6 and R7 are selected so that the change of VBG is reduced to the desired low value when the current flowing in regulator 10 varies between its minimum and maximum levels.
In a circuit constructed with the values shown in FIG.
Over a range of that current from 0. VBG exhibited a temperature coefficient of about 0.
Modifications to the embodiment described are contemplated, and the present invention is limited only by the claims following. For example, FIG. The remainder of the circuit of FIG.Alternatively, the desired ratio of emitter current densities can be obtained by using transistors of different emitter junction areas and adjusting the current ratio accordingly. A regenerative feedback configuration controls the potential across the second resistance responsive to the controlled current.
Over a range of that current from 0. That sum is about 1. Voltage reference circuits, commonly referred to as "band-gap voltage reference circuits", can be employed as a two-terminal voltage regulator substitutable for an avalanche diode.