PT3100-4100系列隔离DC-DC转换器的可靠性预测

Reliability Prediction for PT3100/4100 Isolated
DC-DC Converters
Power Trends’ isolated DC-DC converters are designed for high efficiency, small size, and high reliability.
Reliability prediction is used not only for estimating time to failure but also as an important design tool. The calculations
can help locate problem areas by identifying overstressed parts or finding the highest contributor to failure.
It determines the reliability impact of design changes as well as the degree of environmental control needed to achieve
a desired reliability objective. To attain the best reliability, Power Trends uses the latest and most advanced technology
in power supply components and very low thermal resistance materials for packaging.
Design and Construction The Power Trends’ PT3100/4100 Series uses a forward converter topology as shown in Figure 26.
These converters switch at fixed frequencies of 650Khz or 850Khz depending on the unit. The high frequency allows for
small magnetics and capacitors. The unit is packaged using a copper leadframe, ceramic printed circuit board, and aluminum
case. It is designed to have very low thermal resistance from the internal components to the outer case. Thermal
characteristics are important to understand because device temperature is a significant variable in reliability calculations.