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| 2SD1819AR-TX资料 | |
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2SD1819AR-TX PDF Download |
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File Size : 116 KB
Manufacturer:PANASONIC Description:The shutdown circuitry consists of a quad comparator IC (IC2), a lamp resonance current detection circuit* (R21, R22, R38, C16, D12) and a pull-up lamp removal circuit (R23, R24, R25, R26, D16, C22). The current detection rectifies and integrates a measurement of the lamp resonant current and is compared against a fixed threshold voltage. Should the current exceed the threshold in the event of over-current due to a non-strike condition of the lamp or non-zero voltage switching of the half-bridge due to one or more broken lamp cathodes, the CT pin of the IR2153 is latched below the internal shutdown threshold (1/6 Vcc) and the ballast turns off. The negative temperature coefficient of the rectifying diode of the current measuring circuit (D12) also causes the current measurement to increase with increasing ambient temperature, therefore latching the ballast off in the event of excessive ambient temperatures. In the event of a lamp exchange, the latch is reset with the pull-up network at the lamp, and the CT pin of the IR2153 is held below the internal shutdown threshold in an unlatched state. When a new lamp is reinserted, the ballast performs an auto restart without a recycling of the input line voltage. For a dual lamp ballast, a second pull-up network is added to the second lamp (R27, R28, R29, R30) and is OR-ed together with the first lamp. If either lamp is removed during running, the ballast turns off. Should the upper cathode of either lamp break during normal operation, then the good lamp will continue running as long as the zero- voltage switching condition on the half-bridge is fulfilled. If the total lamp resonant circuit current for the one-lamp case is not high enough to commutate the snubber capacitor (C18) during the deadtime of the half-bridge, then the resulting current will exceed the threshold voltage of the current limit circuit and the half-bridge will latch off. This is a function of the DC bus voltage, the lamp type, the lamp resonant circuit (L4, L5, C21, C23), the running frequency (R20, C13), the snubber capacitor (C18), the current sensing resistor (R22) and the current limit threshold (R14, R15). All of these parameters must be correctly chosen for each new lamp type such that the lamp is driven to the manufacturers recommended lamp power while achieving complete lamp fault protection |
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| 1PCS | 100PCS | 1K | 10K | ||
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型 号：2SD1819AR-TX 厂 家：PANASONIC 封 装：SOT-323 批 号：02+ 数 量：6314 说 明：绝对全新原装大量现货，质量保证，欢迎来电查询 |
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运 费： 所在地： 新旧程度： |
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| 联系人：李利媛 |
| 电 话：0755/83019596,83247541,83247486 |
| 手 机：13480648723 |
| QQ：1104562168,1178139673,1113496577,2881934444,2881943289,2881943290 |
| MSN：ao-liteng01@hotmail.com,ao-liteng02@hotmail.com,ao-liteng03@hotmail.com,ao-liteng04@hotmail.com |
| 传 真：0755-83016216 |
| EMail：aoliteng1@163.com |
| 公司地址： 广东省深圳市福田区振兴西路新欣大厦B座518室 |
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