dcdc power supply module power margin problem

dcdc power modulePower headroom problem! "Design Margin" is actually a love-hate indicator. Because the essence of margin design is actually to prevent accidents, it should be noted that insufficient margin design will have hidden dangers of quality problems, and excessive margin design will increase costs. Due to the universality of embedded system applications in different industries at present, the load situation is also diverse: some are resistive loads, some are inductive or capacitive loads, some are relatively stable, some are more volatile, and some are even There may also be no-load, or full-load, or instantaneous load increase, or instantaneous load drop, so this makes it difficult to determine the power level of the power module.

In general, the size of the load current is the key factor in determining the power, so if you want to comprehensively deal with the stability and anti-accident ability of the embedded system design, the editor recommends that 20% of the design margin should be reserved according to the actual situation, that is In actual use, the ultra-high power does not exceed 80% of the rated power of the power supply module, because in this power range, the performance of the power supply module is relatively full and stable and reliable. If the margin is too large, resources will be wasted, but if the margin is too small, it is not conducive to temperature rise and reliability. For loads with large fluctuations, the design should meet the basic principle that the peak current does not exceed the large tolerance range of the power supply module, and the design margin can be appropriately increased according to the frequency of load fluctuations to improve the reliability of the module to a greater extent.

The power of the dcdc power supply module, that is, the super power that the module can normally output, also needs to be combined with the derating curve of the module, and the output power is related to the working environment temperature of the power supply and the input voltage value. Generally, when a higher voltage and a lower voltage are input, the power that can be normally output will decrease. For the same reason, when the module is allowed to work at a higher temperature and a lower temperature, the output power of the module will also decrease. Generally, the amplitude of different power supplies is different. For low temperature environment, the test of the module is relatively large, but in high temperature environment, because the life of the components is directly related to the temperature, it also needs to be derated for use.