SNVAA17 Application note

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 Schematic

Table 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