90W Switching Power Supply -AC/DC SMPS Adapter -Desktop
180/220/300W桌面適配器
LED路燈電源
隨機展示
42W Switching Power Supply | AC/DC SMPS | Open Frame
36W Switching Power Supply -AC/DC SMPS Adapter -Desktop
17W Switching Power Supply | AC/DC SMPS | Open Frame
12W系列插牆式適配器
首頁電源部落格 Input filter interaction with SMPS (8 of 13)
Input filter interaction with SMPS (8 of 13)
Practical Placement of Input Filter
Placement. P5 is the most practical placement of the input filter.
Input L. In this location, added input inductance from a system EMI filter or long leads to the power source will not cause the power supply to go unstable since Ls will migrate to the left, which is safe, and will not increase the Q.
Output C. However, added output capacitance may cause Co to migrate causing instability. The input filter capacitance Cs should be greater than the reflected output capacitance Co, including any added load capacitance.
Degradation. Penetrating the Rd line will degrade regulator output impedance. This is often acceptable if the output impedance degradation is less than the maximum regulator output impedance. This maximum usually occurs near where the loop gain passes through unity.
Damping. A well-damped input filter simplifies the design and there are other compelling reasons to damp the input filter.
Do not use this information for design without independent verification of the information.
