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The Safe constant current CIRCUIT (IRF9520)

2017-07-09 02:31  
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This article describes the The Safe constant current CIRCUIT (IRF9520). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components:IRF9520.

Figure the top is a Safe constant-current source circuit, how it works″
A cmos op-amp (number ICL 7611) controls the input current through a P-channel Hexfet power transistor (No. IRF9520), then to keep up a constant voltage across the R1.
As they are connected in a serial form, so use the together current by: I = VREF /R1 , while the Vref to be defined by the IC2 is 1.25V.

The advantage of this outline are:
1. The load current is limited by R1 when the load is too heavy.
2. The op-amp and Hexfet there are the overhead voltage very low.


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