Introduction: The power supply IC is used to regulate the stability of the output voltage and current of the power supply. It is a control integrated device. Non professionals may not know much about it, nor do they know much about its purchase. Today, let's take a look at how to purchase power supply Ic.

Guide for purchasing power supply Ic

1. Step up transformer is preferred. This step-up transformer will have many advantages, such as improving efficiency and reducing the number of batteries, which are the standards consumers pursue when using power.

2. When negative power supply is required, charge pump shall be used as far as possible. The negative power supply can be used in some portable instruments. Since the current used in the operation of this instrument is not very large, it is the simplest method to use the charge pump Ic to form a voltage reversal circuit. If small noise is required in use, it is better to use charge pump Ic with LOD linear regulator.

3. The best conditions for using LDO. When using, it is recommended to use a linear regulator if there are following requirements, such as low output voltage ripple, low noise, small input and output voltage difference, etc.

4. Do not pursue the latest devices with high accuracy and full functions. The power supply IC will have certain accuracy requirements. When selecting the power supply IC, we should select the power supply IC with appropriate accuracy according to the requirements of the specific circuit, so that we can reduce the production cost. For those new devices with complete functions, their prices are relatively expensive. Therefore, if the power supply does not need to be turned off or there is no microprocessor in the product, it is not necessary to choose the latest device with complete functions, so that the cost can be reduced and the size can be smaller.

5. Don't pull the cart by the horse. The power supply Ic has three important parameters, namely, input voltage, output voltage and maximum output current. In practice, we should choose the appropriate power supply Ic according to the working current of the product. The appropriate maximum working current in operation is 70% - 90% of the maximum output current of the power supply Ic.

6. When the output current is large, step-down transformer shall be used. Generally speaking, the working current of portable electronic products is mostly below 300mA. If 1-2 batteries are used, the service life of the battery will be reduced when the product is boosted. At this time, the step-down converter will have the same efficiency as the step-up converter, but the battery life will be greatly increased.

The power supply Ic still has some technology when purchasing. After a brief introduction, we believe that now you have a certain understanding of how to purchase the power supply Ic. You can try to apply these tips to purchase the most appropriate power supply Ic.