* Question
| The power sequence is often implemented in a cascaded way. What is wrong with this approach? |
* Answer
| 1 It is difficult to synchronize the power supply on the whole PCB without violating the E-power and power-off sequences of each component.Therefore, this requires the use of Resistorss and capacitors in the design to delay the power-up of a given power supply.
2 Designers have to use a lot of off-the-shelf circuits to monitor all the power supplies on the board, and to generate final monitoring signals such as power-down interrupts, power-on resets, and additional logic gates. 3 Today, there is very little focus on the processing of power-off sequences. 4 It is very difficult to implement power management that can be extended to a card. |
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