资料下载
×
Pulse Power Rating of Semicond
消耗积分:3 |
格式:rar |
大小:455 |
2009-11-26
分享资料个
Pulse Power Rating of Semiconductors
The admissible dissipation of diodes, rectifiers and Zener
diodes which operate from sinusoidal supplies is based on
the arithmetic mean value of junction temperature and
power dissipation. Devices which handle pulses are capable
of passing short-term currents far in excess of the
maximum admissible static dissipation, and in this case it is
admissible to exceed the continuous dissipation curve for
the duration of each pulse. The magnitude of the admissible
current is then inversely proportional to the pulse duty
factor, because power is dissipated only intermittently, and
the thermal capacity of the system and heat conduction
prevent an undue rise in junction temperature. Some of the
data sheets contain diagrams which allow the rating of a
device operating under pulsed conditions to be determined.
In Figure 1, which applies to diodes and rectifiers, the
maximum admissible pulse current amplitute is plotted as a
function of pulse duration for an ambient (or case)
temperature of + 25°C. If the device is to operate at higher
ambient temperatures, then it is necessary to derate the
current values derived from this diagram in accordance with
the “admissible dissipation versus temperature” curve.
The admissible dissipation of diodes, rectifiers and Zener
diodes which operate from sinusoidal supplies is based on
the arithmetic mean value of junction temperature and
power dissipation. Devices which handle pulses are capable
of passing short-term currents far in excess of the
maximum admissible static dissipation, and in this case it is
admissible to exceed the continuous dissipation curve for
the duration of each pulse. The magnitude of the admissible
current is then inversely proportional to the pulse duty
factor, because power is dissipated only intermittently, and
the thermal capacity of the system and heat conduction
prevent an undue rise in junction temperature. Some of the
data sheets contain diagrams which allow the rating of a
device operating under pulsed conditions to be determined.
In Figure 1, which applies to diodes and rectifiers, the
maximum admissible pulse current amplitute is plotted as a
function of pulse duration for an ambient (or case)
temperature of + 25°C. If the device is to operate at higher
ambient temperatures, then it is necessary to derate the
current values derived from this diagram in accordance with
the “admissible dissipation versus temperature” curve.
声明：本文内容及配图由入驻作者撰写或者入驻合作网站授权转载。文章观点仅代表作者本人，不代表电子发烧友网立场。文章及其配图仅供工程师学习之用，如有内容侵权或者其他违规问题，请联系本站处理。 举报投诉
评论(0)
发评论
- 相关下载
- 相关文章
