1. Can the ripple voltage of PBA1000F-36 be reduced to less than 50mVp-p?
Answer : Yes. |
2. Is it possible to reduce the ripple voltage of ZUS152405 to less than 20mVp-p by testing with 20 MHz oscilloscope?
Answer :  |
3. Why CBS2004848-R has sound noise when the load current is zero?
Answer : Because the transformer insides makes noise when the load current is zero or very small due to magnetostrictive resonance. |
4. Is it possible for using the external circuit diagram to make the output ripple noise of DBS400B15 less than 10mVp-p?
Answer : We recommend to add a common mode coil between output terminals and E2 (electrical capacitor). The value is 1~2mH approximately.
If the coil is added to DBS's output, the output noise may be reduced to 10mV or less.
Please evaluate under the end-user's condition before using. |
5. The option G is the capacitor between input and output is removed. Could you explain the function of option G? And why is SUS1R5 series without the option G?
Answer : SU1R5 doesn't have option G which is without the capacitor between input to output.
But SU3, 6 and 10 have its capacitor.
The followings are the advantages and disadvantages of option G:
Advantages: reducing through noise from input to output
Disadvantages : Ripple noise of option G is bigger than normal type. |
6. In order to reduce the ripple voltage, we added a inductor (L) on the output side. But the recommended external circuit doesn't have inductor at output terminal? What is the advantages and disadvantages of using inductor at output terminal?
Answer : External inductor is used to reduce the output noise than no inductor.However, the inductor is bigger and more expensive than a capacitor.Therefore, we recommend the capacitor only without inductor at first.If the noise is not reduced the capacitor only, external inductor must be added. |
7. Can PBA30F-5 PBA30F-9 PBA30F-12 meet the ripple noise level below 80mVp-p?
Answer : Those power supply the ripple noise can be smaller than 80mVp-p under testing condition 25 degree and using 20MHz oscilloscope. Please check the attached pdf file. |
|
8. We are using 2 pcs CBS504805 in parallel redundancy operation. Why is the ripple noise so big? It is around 400mVp-p.
Answer : After we checked your circuit pattern, we found some mistakes about your mounting method. Please change the circuit pattern , don't put the input and output pattern underneath the power modules. Please check instruction manual 6.1 Mounting method. |
