Optocoupler Current Limit at Harriet Irwin blog

Optocoupler Current Limit. At 100°c, it might be 10s, 100s of µa. The pc817 must then be capable of producing the necessary output. The led also needs at least some amount of current for it to work at all and take led aging into account, but in general, brighter led means more. Dark current is specified at max. Max forward voltage of the led is 1.4v, with 1k resistor and 3v3 gpio that gives a minimum 1.9ma led current. The actual ctr value depends (among other things) on the input and output current. The output current available from a hct gate to drive the optocoupler input is limited to 4ma, which is quite low for driving an optocoupler. 100na, but it increases exponentially with temperature; With optocouplers, it is essential to understand not only the device’s main parameters and parasitic elements, but also their tolerances and variations.

What is Optocoupler ? How Optocoupler Works ? The Optocoupler Explained
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With optocouplers, it is essential to understand not only the device’s main parameters and parasitic elements, but also their tolerances and variations. The output current available from a hct gate to drive the optocoupler input is limited to 4ma, which is quite low for driving an optocoupler. 100na, but it increases exponentially with temperature; Dark current is specified at max. At 100°c, it might be 10s, 100s of µa. The led also needs at least some amount of current for it to work at all and take led aging into account, but in general, brighter led means more. The actual ctr value depends (among other things) on the input and output current. The pc817 must then be capable of producing the necessary output. Max forward voltage of the led is 1.4v, with 1k resistor and 3v3 gpio that gives a minimum 1.9ma led current.

What is Optocoupler ? How Optocoupler Works ? The Optocoupler Explained

Optocoupler Current Limit The output current available from a hct gate to drive the optocoupler input is limited to 4ma, which is quite low for driving an optocoupler. The led also needs at least some amount of current for it to work at all and take led aging into account, but in general, brighter led means more. The pc817 must then be capable of producing the necessary output. 100na, but it increases exponentially with temperature; Dark current is specified at max. The actual ctr value depends (among other things) on the input and output current. Max forward voltage of the led is 1.4v, with 1k resistor and 3v3 gpio that gives a minimum 1.9ma led current. The output current available from a hct gate to drive the optocoupler input is limited to 4ma, which is quite low for driving an optocoupler. At 100°c, it might be 10s, 100s of µa. With optocouplers, it is essential to understand not only the device’s main parameters and parasitic elements, but also their tolerances and variations.

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