Many unused switch power supply design engineers will have some fear of it, such as interference with switching power supply problems, PCB layout problems, component parameters and type selection issues. In fact, as long as you understand, the use of switching power supply design is still very convenient.
A switching power supply generally includes a switching power supply controller and output of two parts, some controllers will MOSFET integrated into the chip to go easier, but also to simplify the PCB design, but the design flexibility is reduced.
Switching controller is basically a closed-loop feedback control system, so in general there will be a feedback output voltage sampling circuit and feedback loop control circuit. Therefore, this part of the design is to ensure accurate sampling circuit, but also to control the depth of feedback, because if the feedback loop to respond too slowly, the transient response capability will have a significant impact.
The output part of the design includes the output capacitor, the output inductor and the MOSFET, etc. The choice of these devices is basically to meet the balance of performance and cost, such as high switching frequency can use a small inductance (meaning small package and cheaper Of the cost), but high switching frequency will increase the interference and switching losses on the MOSFET, resulting in lower efficiency. The result of low switching frequency is the opposite.
The ESR for the output capacitor and the MOSFET's Rds_on parameter selection are also critical. A small ESR reduces output ripple, but the cost of the capacitor increases and the good capacitor can be expensive. Switching power supply controller drive capacity should also pay attention, too much MOSFET can not be driven well.
In general, the supplier of the switching power supply controller will provide specific calculation formulas and usage schemes for reference by engineers.
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