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jjlamshushushu 发表于 2013-10-15 15:19 ' ~: _) `+ T( c
所有回帖都看了,还是不明白UL8750的插图8.1关于50W试验是如何做测试的。请指点迷津,谢谢!
5 v5 H4 D" a6 F4 b- A. F其实你可以看看UL 的DS的
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Connect a wattmeter and an adjustable resistive load across the capacitor or semiconductor junction under test. The load resistor should be capable of handling at least 50 Watts and should be set for its maximum resistance at the start of the 'test'.6 S) c- S) a2 N1 a" a7 v) `4 J
Close the knife switch on the protective device in the circuit. Then adjust the load resistor to cause a power dissipation of exactly 50 Watts as indicated by the meter. Open the knife switch across the protective device. If the protective device functions within 1 minute to reduce available power to less than 50 Watts, the point under test is considered not capable of delivering 50 Watts for one minute. Similarly, if a circuit component or components, open in less than 1 minute, or current is inherently limited to keep power below 50 Watts, the test point is considered as not capable of delivering 50 Watts for 1 minute.
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