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An ideal current source generates a current that is independent of the voltage changes across it. An ideal current source is a mathematical model, which real devices can approach very closely. If the current through an ideal current source can be specified independently of any other variable in a circuit, it is called an independent current source.
A constant current source circuit constructed with LM317. The device can be configured to regulate the current to a load, rather than the voltage, by replacing the low-side resistor of the divider with the load itself. The output current is that resulting from dropping the reference voltage across the resistor. Ideally, this is:
Whatever current flows into Y also flows into X, and is mirrored at Z with a high output impedance, as a variable constant current source. In sub-type CCI+, current into Y produces current into Z; in a CCI-, current into Y results in an equivalent current flowing out of Z. [2]
Reference input current I REF is independent of I CA and fairly constant, at around 2 μA. The network feeding reference input should be able to source at least twice this amount (4 μA or more); operation with hanging REF input is prohibited but will not damage the TL431 directly. [10]
The variable I B2 is the base current of the output transistor, ... the circuit should be driven by a constant current source rather than using the resistor R 1.
A regulated power supply is an embedded circuit; it converts unregulated AC (alternating current) into a constant DC. With the help of a rectifier it converts AC supply into DC. Its function is to supply a stable voltage (or less often current), to a circuit or device that must be operated within certain power supply limits.
In electronics, a constant current system is one that varies the voltage across a load to maintain a constant electric current.When a component is indicated to be driven by a constant current, the driver circuit is, in essence, a current regulator and must appear to the component as a current source of suitable reliability.
Adjustable tuning is commonly achieved with a ... The shunt version of the circuit is intended to be driven by a high impedance source, that is, a constant current ...
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