Asia-Pacific
English
简体中文
繁體中文
한국어
日本語
Americas
English
Europe (EMEA)
English



型号搜索

交叉搜索

About information presented in this cross reference

The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.
TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.

关键词搜索

参数搜索

库存查询与购买

瞬态热阻与安全工作区(SOA)

热阻被计算为由相对于功耗的单个脉冲施加所引起的温度变化率。瞬态热阻是器件对单个脉冲的响应,用脉冲持续时间表示。

根据瞬态热阻计算SOA的热限制区。

瞬态热阻用于计算由施加瞬时脉冲功率导致的结温升高。瞬态热阻也可用于估算由施加连续脉冲功率导致的结温升高。

详见Bipolar Transistor Application Note: Thermal Stability and Thermal Design

结温与SOA之间的关系如下所示。

Tj(max)=rth(j-c) x Po+Ta

从图1可以看出,当脉冲宽度为10ms时,

瞬态热阻读数为:

  rth(j-c)=0.92°C/W

最高结温(Tj(max))的峰值功率

 计算如下:

150°C=0.92°C/W*Po+25°C

Po=125/0.92=135.8W

例如,当VCE=80V时,

集电极电流计算如下:

135.8/80=1.7A

图1:瞬态热阻与脉冲宽度
图1:瞬态热阻与脉冲宽度
图2:安全工作区(SOA)
图2:安全工作区(SOA)

因此,在图2所示的SOA图中,由瞬态热阻限定的区域是由蓝色虚线界定的区域。必须在该虚线所限定的区域内使用双极晶体管,以保证其结温不超过规定的Tj(最大值)

由瞬态热阻限定的安全工作区(SOA)表示为热击穿限制。

在新窗口打开