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
No big difference, can be achieved, and the quality can also be designed to have no problem, in fact, you have to from the supply cycle, price and cost to consider, may wish to simply do the cost of three kinds of programs contrast
Cost requirements for high UC3844
The size of the requirements of the high TOP
Viper not used, not stand
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
