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| SN54S112J资料 | |
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SN54S112J PDF Download |
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File Size : 105 KB
Manufacturer:TI Description:• Average CRT cut-off voltages • Maximum average beam currents • Highest duty cycle Once these parameters are known, the system designer can then calculate the maximum ambient temperature surround- ing the SN54S112J without a heat sink. A small, low-cost heat sink may be used if the calculated maximum ambient tem- perature does not satisfy the worst-case operating tempera- ture inside the TV. The following example shows how to determine the maxi- mum power dissipation and maximum ambient temperature and assumes the recommended application circuit is used (see Figure 6). Example The SN54S112J uses 1.0W of static power from the 220V and 8V supplies, assuming the worst-case supply currents. If the average CRT cut-off voltage of all channels is 180V and each SN54S112J output sinks a maximum average beam cur- rent of 1.0 mA at 77% duty cycle (480p format) at the highest brightness setting, the SN54S112J will dissipate: PDISS = PSTATIC + 3 x (VCUT-OFF x IAVGMAX) x ä, or PDISS = 1.0W + 3 x (180V x 1.0 mA) x 0.77 = 1.42W. The maximum thermal resistance from junction-to-air, JA, and maximum junction temperature, TJMAX, are stated in the Section Absolute Maximum Ratings . Therefore, the maxi- mum ambient temperature surrounding the SN54S112J can be calculated: TAMAX = TJMAX - (PDISS x JA), or TAMAX = 150˚C - (1.42W x 68˚C/W) = 53˚C. |
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| 1PCS | 100PCS | 1K | 10K | ||
| 价 格 | |||||
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型 号：SN54S112J 厂 家：TI 封 装：0520+ 批 号：474 数 量： 说 明： |
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运 费： 所在地： 新旧程度： |
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