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參數(shù)資料
| 型號(hào)： | VT900 |
| 廠商： | PerkinElmer Inc. |
| 英文描述： | Photoconductive Cells and Analog Optoisolators (Vactrols) |
| 中文描述： | 光導(dǎo)細(xì)胞和模擬光隔離器（Vactrols） |
| 文件頁數(shù)： | 13/76頁 |
| 文件大小： | 1240K |
| 代理商： | VT900 |
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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
semconductor filmcan 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 determne the maximumoperating or
peak voltage that the cell will experience in the circuit and choose an
appropriately rated cell. Typical voltage rates range from100V 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 determning
which characteristics are most important tin the application.
PerkinElmers standard photocells in this catalog are manufactured
using one of two different material types offered: type “” or type “3”.
In general, material type “” 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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