SNVAA17 April 2021 LM25180-Q1 , LM25183-Q1 , LM25184-Q1 , LM5180 , LM5180-Q1 , LM5181-Q1
1.1 Test Schematic
The modified schematic shown in Figure 1-1, was used for all of the testing in this document. Modified components are shown in the red circles and in Table 1-1. The details of T1 and C3a are shown in Figure 1-2 and Figure 1-3. For more information, see the LM5180-Q1 Single-Output EVM User's Guide.
Figure 1-1 Modified EVM SchematicTable 1-1 Changes to EVM
| Reference | Modification |
|---|---|
| C3a | Added C3a; same value and location as C3; 0.1 μF |
| L2 | Changed from 10 μH, Würth, 744042100 to 4.7 μH Würth, 744042004 |
| C8, C10 | Changed value of both capacitors from 22 pF to 100 pF |
| T1 | Wrap transformer with copper shielding tape. Shield grounded at one point on primary side. |
| C1 | Install C1. 1000 pF, 2kV, 1206, X7R |
Figure 1-2 Copper Shielding of
T1
Figure 1-3 Location of C3a