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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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VT83CT датащи(PDF) 13 Page - PerkinElmer Optoelectronics |
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VT83CT датащи(HTML) 13 Page - PerkinElmer Optoelectronics |
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13 / 76 page  8 Selecting a Photocell Many low voltage situations involve very little power, so that the photocell can be small in size, where voltages and/or currents are higher, the photocell must be physically larger so that the semiconductor film can dissipate the heat. The following curve of power dissipation versus ambient temperature describes the entire series of cells for operation in free air at room ambient (25°C). Note that regardless the size, all photocells derate linearly to zero at an ambient temperature of 75°C. The adequate heat sinks can increase the dissipation by as much as four times the levels shown in this graph. Maximum Cell Voltage At no time should the peak voltage of the cell exceed its maximum voltage. the designer should determine the maximum operating or peak voltage that the cell will experience in the circuit and choose an appropriately rated cell. Typical voltage rates range from 100V to 300V. What Type of Material is Best? Each specific material type represents a trade off between several characteristics. Selecting the best material is a process of determining which characteristics are most important tin the application. PerkinElmer’s standard photocells in this catalog are manufactured using one of two different material types offered: type “Ø” or type “3”. In general, material type “Ø” is used for applications such as nightlights, automotive sensors. Material type “3” is primarily used in camera, streetlight control, and flame detector applications. |
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