UC3842B、UC3843B 系列为高性能固定频率电流模式控制器。此类器件专门针对离线和 DC-DC 转换器应用而设计,为设计人员提供了外部部件极少的成本高效方案。这些集成电路具有振荡器、温度补偿参考、高增益误差放大器、电流传感比较器和高电流图腾柱输出,适用于驱动功率 MOSFET。还包括了保护功能,有输入和参考欠压锁定且均具有迟滞、按周期电流限制、用于单脉冲计量的锁存,以及每隔一个振荡器周期即对输出进行间隔关断的触发器,可将输出停滞时间编程为 50% 到 70%。此类器件采用 8 引脚双列直插和表面贴装 (SO-8) 塑料封装以及 14 引脚塑料表面贴装 (SO-14) 封装。SO-14 封装具有单独的电源和接地引脚用于图腾柱输出级。UCX844B 的 UVLO 阈值为 16 V(开)和 10 V(关),适用于离线转换器。UCX845B 针对 UVLO 阈值为 8.5 V(开)和 7.6 V(关)的低电压阈值而量身定制。
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Pb
A
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SOIC-8
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UC3845BD1R2G
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Pb
A
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SOIC-8
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2500
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UC3845BDR2G
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A
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SOIC-14
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2500
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UC3845BNG
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UC3845BVD1R2G
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Pb
A
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SOIC-8
1
260
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2500
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UC3845BVDR2G
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Pb
A
H
P
SOIC-14
1
260
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2500
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NA
0
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50
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可靠性数据
Die Related Summary Data
Device: UC3845BD1G
Equivalent to wafer fab process: BP STD LINEAR
产品技术
产品技术
等效器件小时
平均故障间隔时间/平均无故障时间(按小时计算)
FITS
BP STD LINEAR
10
12120914040
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Re-calculate Data
Data is based on the following assumptions.
Note: The temperature and confidence level may be adjusted to your requirements.
Disclaimer: A reliability FIT rate calculated using this tool shall not be used for any functional safety purpose. In case a raw FIT rate needs to be estimated for a component which is targeted to be used in a safety critical application (i.e. compliant to ISO 26262 standard) it should be calculated according to generic safety standards (IEC62380, IEC61709, SN29500, FIDES, etc.)