2 BOM Modifications Required

The following steps must be taken to ensure proper operation of a 1-channel buck converter on a populated 4-channel EVM (TPS7H4001QEVM-CVAL). A summary of all changes is provided in Table 1.

1. Modifications near MASTER DUT U1 (Figure 1 and Figure 6 )
   1. Isolate VSENSE feedback pins 32 of slave devices by removing 0-ohm jumper R21
   2. Isolate soft start (SS/TR pin 31) of slave devices by removing 0-ohm jumper R17
   3. Isolate COMP pin 33 of slave devices by removing 0-ohm jumper R12
   4. Isolate SYNC1 pin 5 of slave devices by removing 0-ohm jumper R11
   5. Isolate SYNC2 pin 6 of slave devices by removing 0-ohm jumper R14
   6. Replace compensation circuit at R7, C14, C15 near DUT U1:
      1. R7=10kohms
      2. C15=10nF
      3. C14=150pF
Figure 1. Modifications near MASTER DUT U1
2. Modifications near SLAVE1 DUT U2 (Figure 2 and Figure 7)
   1. Isolate VIN pin 4 of Slave 1 DUT U2 by removing 0-ohm jumper R30
   2. Remove input capacitors of Slave 1 DUT U2 by completely removing, or lifting one terminal of each capacitor as shown in Figure 3. (C35, C36, C38, C39, C40, C41, C42, C43)
   3. Remove output capacitors of Slave 1 DUT U2 by completely removing, or lifting one terminal of each capacitor so as to remove from circuit as shown in Figure 3. (C52, C53, C54, C55, C56, C57, C58, C60)
Figure 2. Modifications near SLAVE1 DUT U2
3. Modifications near SLAVE2 DUT U3 (Figure 4 and Figure 8)
   1. Isolate VIN pin 4 of Slave 2 DUT U3 by removing 0-ohm jumper R39
   2. Remove input capacitors of Slave 2 DUT U3 by completely removing, or lifting one terminal of each capacitor as shown in Figure 3. (C63, C64, C66, C67, C68, C69, C70, C71)
   3. Remove output capacitors of Slave 2 DUT 3 by completely removing, or lifting one terminal of each capacitor so as to remove from circuit as shown in Figure 3. (C80, C81, C82, C83, C84, C85, C86, C88)
Figure 3. Open Circuit Input/Output Capacitors
Figure 4. Modifications near SLAVE2 DUT U3
4. Modifications near SLAVE3 DUT U4 (Figure 5 and Figure 9)
   1. Isolate Enable pins 2 of slave devices by removing 0-ohm jumper R55
   2. Isolate VIN pin 4 of Slave 3 DUT U4 by removing 0-ohm jumper R50
   3. Remove input capacitors of Slave 3 DUT 4 by completely removing, or lifting one terminal of each capacitor as shown in Figure 3. (C91, C92, C94, C95, C96, C97, C98, C99)
   4. Remove output capacitors of Slave 3 DUT U4 by completely removing, or lifting one terminal of each capacitor so as to remove from circuit as shown in Figure 3. (C108, C109, C110, C111, C112, C113, C114, C116)
Figure 5. Modifications near SLAVE3 DUT U4