Posts Tagged ‘ Sequencing ’

Back to Basics: How do I Ensure Correct Power Rail Sequencing in a Multi-Rail Power Architecture?

January 6, 2014
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Back to Basics: How do I Ensure Correct Power Rail Sequencing in a Multi-Rail Power Architecture?

For a graphic illustration of why power sequencing is essential, consider what could happen in a large industrial system if its motors and actuators became energized before its control electronics. Clearly, the potential for such unpredictable and dangerous scenarios must be eliminated with carefully-designed power start-up sequences. And shutdown sequences are equally as important. Incorrect power sequencing can cause problems at the semiconductor as well as at the system level: these conditions could lead to unexpected reverse bias across a CMOS device. This can damage or destroy the device, or latch it into an...

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Power Supply Sequencing

January 15, 2011
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Power Supply Sequencing

Voltage rails on electronics pcbs are proliferating as processors tend towards multi-voltage architectures and board designs incorporate multiple processors. Such proliferation brings complexity to the power switching task, because the supply rails must be powered up and down in the right sequence. Each processor’s voltage and timing requirements must be considered before adding to an overall scheme that meets the needs of all the onboard processors. Some processors use voltage – based sequencing (Turn on Rail 2 when Rail 1 reaches its set voltage) while others use time- based sequencing (Turn on Rail 1,...

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