片最大的输出 电流能到700MA,也可以改变限流电阻限流它的输出 电流，限在500MA.芯片的外围也简单，过认证出口完全没有问题。我们提供全程的技术协助。
What is the simplest circuit for changing AC 220v to DC 9v? The 9v output current required is not less than 500ma, and it needs to work for a long time and be stable! What electronic components are used and how to connect them? In addition, the 12v power supply in the computer case needs to be changed to 9V 500ma. What kind of circuit is it?
Use a non-isolated 220v to DC 9v step-down chip, no need to use a bulky transformer, the input voltage can be from 45v-265v, the output voltage can be adjusted through the FB resistor (you can change the resistance if you want to output a voltage other than 9v ), 220v to DC 9v step-down core
The maximum output current of the chip can reach 700MA, and the current limiting resistor can also be changed to limit its output current, which is limited to 500MA. The periphery of the chip is also simple, and there is no problem with the certification export. We provide full technical assistance.