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i think that is because the data will transfer in two direction , for the MCLK is comes from controller ,if you used the MCLK to sample the data output from DDR you will have some trouble in sync between data and clk,it easier to control the timing when using the DQS come out from memory...
do you feel confused if there is no AC component in the power source ,and where the AC component to EA comes from ,right?
the AC component to EA side not comes from the source only,but also and mainly comes from the loading side,because the purpose of keeping the feedback loop stabilize is...
it has some relationship with the sink current of ADC module you used,some times when ADC measure the voltage of the resistor divider,it will sink some current from the resistor divider and forms some voltage dropout if the resistance of the top resistor is big enough,so if you still can not...
there are my thoughts about you question,hope it can helps you
1,if you want to calculate the equivalent resisrance brings by parastics inductor,you need to know how much inductance there are,but that hard to be confirmed ,so the best way to find the result is checking the table which caps...
maybe below equation can answer your question about charging time of inductor:
V=L*(di/dt) and we can change the that into L=(V*dt)/di
we know L will not changed once the inductor was choosen ,so,acording to data from table you provide:
1,if charge current is incresed,the charging time will be...
the TVS or zener diode with high power dissipation can solve my problem,but it is very expansive too，so,i have to choose the method cheap and effective.
hi FvM,thanks for your reply. there are some information about the background of the issue, the protection circuit we talk above was used for chrger port of mobile phone,and i knew the IEC61000-4-5 was used as test case for the device like charge adapter ,in fact,there is no standard for surge...
hi guys,
could you give me some advise about how to design a effective protection circuit as mentioned and the cicuit should consist of the simple componets only, cause the boss do not wanna spend too much money on it!! :cry: .i have tried some devices like zener diode or power TVS,but...
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