Q:How to make the switching power supply does not delay power

If you want to add their own words at the same time chanting Do not need to isolate the direct use of the input to control a switch when the input voltage is not the time to turn on the switch tube power output pull If you need isolation with optocoupler to control the switch tube

Q:What is the flashing time in the switching power supply?

Of course, there is no set of blanking time IC can be an RC filter to take this spike, the effect is the same.

Q:Output + 5V, plus or minus 15V, +24 V, not isolated 15V. Input 85 ~ 220AC, the total power of about 20 watts. I see three kinds of control chip, UC3844 similar products in the most widely used, but the internal non-integrated power tube, peripheral devices are more. VIPER I used the 12, the frequency fixed 60K, so the transformer will be relatively large, PCB also have to do big. I tend to use top223 similar products in almost no use top series, I worry about its stability, and the price of single tube seems to be the highest. These two days the boss will I set down, I hope a master to give pointers. If these three kinds of chips have any other differences also please enlighten, thank you

TOP and VIPER than: really TOP than VIPER price of your point, but the high frequency of 40K it, in fact, TOP223 can replace the VIPER, you do 20W output looks like TOP223 is not enough because the 223 wide range of input 85-265AC can only do 15W (P or G package), Y package 223Y can do 30W, but have to leave the margin? And 3844 compared to the first two: you can freely choose the appropriate MOS tube, higher operating frequency, a variety of forms of protection. The above is a more obvious difference, the specific or look at the cost of indicators required. You do not know how to use the multi-channel regulator with three? Cross adjustment rate has been a tune! Haha

Q:I have an output voltage of 3V, 500MA switching power supply, would like to change the output voltage of 5V charger specific parts to change the value, such as feedback resistor, switch transformer (there are two).

You are too general about your system in the end is a thing. The The Suggest you to simulate yourself. The This can be casually try

Q:How to constant voltage switching power supply into a constant current, how to rectification ?

You give specific parameters, I give you the device model and practical circuit diagram (provided that the output current can not be too large, the load impedance can not be too high).

Q:Switching power supply isolated design, what is the meaning of isolation?

Switching Power Supply The dual isolation design means that the transformers inside the power supply are electrically incompatible (they are magnetically coupled, the primary windings and the two secondary windings are not connected to each other), and the corresponding external and electrical paths are also Unrelated, both outputs are not common

Q:Switching power supply, starting resistor is very hot, no output. What is the reason.

You ask the question is the common problem of switching power supply, you have to study the power schematic diagram! Practice basic skills.

Q:24V 1A switching power supply how to output 0-10V I <1mA adjustable signal ah

Generally this is used in the adjustable DC regulator power supply above.

Q:Two-wire NPN near switch, switching power supply, and how to connect with Mitsubishi PLC?

You can not use the switching power supply, direct use of PLC input point

Q:Switching power supply how maintenance

Check whether the input, and then check the switch control circuit part, and finally the power drive sector.