Tool/software:
hi expert
1.Design and application conditions: U1 input voltage 29.2V±0.5V, U1 output voltage 5.4V, output current 3.5A max
2.The schematic diagram of the two schemes is as follows: Scheme 1:
Note: C52/C104 is a ceramic capacitor: GRM31CR71H475KA12L (CC-1206-4.7UF/50V±10%X7R);
Option 2:
Note: C63/C64/C371/C52/C104 are ceramic capacitors: GRM31CR71H475KA12L (CC-1206-4.7UF/50V±10%X7R); Among them, the difference between the two schemes is: the position of L1 at the input end of U1 is different; Among them, the devices of scheme 1 and 2 are the same.
| Designation |
Type description |
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C20，C22，C23 |
VZH220M1HTR-0606（50V/22uF） |
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C105~C108，C168，C249 |
C3216X7R1C106KT（CC-1206-10uF/16V±10% X7R） |
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C63，C64，C371，C52，C104 |
GRM31CR71H475KA12L（CC-1206-4.7UF/50V±10%X7R） |
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L2 |
10uH/9A |
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L1 |
5.6uA/1.6A |
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U1 |
TPS5450DDA |
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D1 |
PDS760-13（7A/60V） |
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3. Question:
1) Is the schematic scheme of Scheme 1 and Scheme 2 technically feasible?
2) In scheme 1, U1 input is LC filter circuit, L1 front end is aluminum electrolytic capacitor and ceramic capacitor, L1 and U1 input end is ceramic capacitor, whether this design meets the device design requirements?
3) Will the change of L1 location in Scheme 2 have different impacts on U1 performance and reliability? Can you confirm whether it is better or worse?
