如何设计便携式产品的电源系统

Locate voltage reference bypass capacitors as nearby the power controller as is possible. Do the same for external oscillator components, when required. Loop stability compensation components must be placed nearby the feedback amplifier pins and away from high edge rate gate drive signals. MOSFET placement must be close to the controller to prevent gate overshoot and ringing when also minimizing the value of the series gate resistor.

5.
Perform a practical worst case design analysis starting with the power train components. These components are generally the most expensive and the most likely to fail if undersized. While it is critical to know the absolute maximum requirements placed on the system power supply, it is more important to know whether these requirements will change over the life of the product. A supply designed to allow for some future increase in power is a reliable design and not necessarily an oversized design. The use of slightly oversized power components does not always imply physically larger components but will always ensure the system is reliable and has some room for growth. Handheld products are always the target of increased features and the inevitable increase in power.