It is defined by a specific input signal in a limited time and refers to the capacity of isolation resistance of the device. Isolation Voltage: Consist in the maximum voltage that can be applied between an optocoupler’s input and output.Optocoupler dissipates power through the Light-Emitting Diode and the phototransistor in the function of LED’s forward current and forwards voltage and phototransistor’s collector current, collector-to-emitter voltage. Power decreases with increasing ambient temperature, generally reaching its maximum at nominal ambient temperature. CTR I C - IF x 100 (1) There are typically a number of CTR groups (binning) to choose from when selecting an optocoupler. Power dissipation: The amount of energy that the device can safely dissipate. The gain of the optocoupler is expressed as a current transfer ratio (CTR), which is the collector current (IC) of the output divided by the forward current (IF) of the input and multiplied by 100.Storage temperature refers to the temperature range that supports the component when it is not powered, -65☌ to +150☌ in space environments. Operating and Storage Temperature: Ambient temperature in which the device (powered) functions standardly, space applications round -55☌ to +125☌. They define the admissible limit of operation. Refer to the front of the optocoupler section of the current catalog. These parameters are fundamental for the functionality of the device. Circuit Design: Main parameters of an optocoupler Absolute maximum ratings To make a good circuit design, we have to know all about the main parameters of an optocoupler and understand the specification. It delivers consistent current transfer ratio at very low. Optocoupler provided isolation between circuits that need to have interaction in between. phototransistor, optocoupler utilizing ON Semiconductor leadingedge proprietary process.
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