Do you know how to select the IC chip of the power adapter?

What is a power adapter IC chip? Do you know? The correct selection of the power adapter IC chip plays a vital role in the adapter. It is related to the stability and service life of the power adapter. The correct choice of the power adapter IC chip can not only extend the The service life of the product can also reduce the failure rate of the product. When choosing a power IC, we must not only meet the circuit performance requirements, but also consider the size, weight, service life and cost of the product. Let’s take a look at the power supply with the editor. How to choose the adapter IC chip correctly!

Adopt the best LDO conditions: the boost DC/DC converter has high efficiency but large ripple and noise voltage, and the low dropout linear regulator has low efficiency but minimal noise. The dual output power IC composed of the two can be compared. To effectively solve the problems of efficiency and noise, when the ripple and noise in the output voltage are required to be extremely small, the input and output voltage difference is not large, and the output current is not greater than 100mA, a micro-power consumption, low dropout (LDO) linear regulator is used Is the most suitable for most portable product applications.

When a negative power supply is required, try to use a charge pump: Most portable instruments require a negative power supply and the current demand is not large. It is easiest to use a charge pump IC to form a voltage inversion circuit. If low noise or output voltage regulation is required, an LDO can be used Linear regulator charge pump IC.

Avoid high-precision selection of appropriate IC chips: Generally speaking, the accuracy of power supply ICs is between ±2% and ±4%. Some high-accuracy ones can reach ±0.5% to ±1%. Suitable power IC chips can not only reduce costs It can also improve the stability of the circuit. If your circuit does not use the power-off function and there is no microprocessor (μP) or microcontroller (μC) in the switching power supply structure, you do not need to choose to work with the power-off function or the output power supply. Status signal device, which can not only reduce the size of the power IC, but also reduce the overall cost. Why not do it.

Choose a matching power adapter IC chip: The three most important parameters of the power IC are the input voltage VIN, the output voltage Vo and the maximum output current Iomax. Through these three requirements, you can determine the line's demand for the power IC and avoid taking a taxi. And to avoid the problem of overloading the power supply IC, when the power adapter is working, the maximum current value is preferably 70 to 90% of the maximum output current of the power adapter IC chip. The above is the analysis of the power adapter IC chip, I hope it can help you.