The transistor here is employed solely for controlling the current at the output to the specified limits. We can see that the IC is associated with an additional active component which is the transistor connected to its ADJ pin. However the IC itself cannot control the current and normally would allow about 5 amp at the output. Here it has been calculated and set for producing around 3.3V at the output, which is the optimal voltage value for driving all types of white LEDs. Circuit OperationĪs shown in the circuit diagram below, in its standard mode the resistor 240 ohms is a regular placement, and the next resistor connected to it is the one which decides the voltage at the output of the IC. Here the IC LM338 has been configured in its standard mode and it perfectly executes the expected current as well as voltage regulations for driving a 3 watt or a 5 watt LED. The same IC yet again takes the center stage in this application too. We have seen quite many power supply and driver circuits in this blog using the IC LM338, that's because this particular device is so versatile with power regulation and control functions. Let's learn more how to operate these devices very safely using a simple power supply. These 3 watt 5 watt and similar high watt LEDs are able to produce highly intense and powerful light outputs, however these are extremely vulnerable too with their operating parameter.
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