This document outlines the procedures required to convert a TSP7H4001QEVM-CVAL, a 4-channel quadrature phase buck converter evaluation module shown in Figure 1, into a 3-channel buck converter EVM.
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The TPS7H4001-SP is a radiation-hardness-assured, 7-V, 18-A synchronous buck converter. Operation of the device is demonstrated on the TPS7H4001EVM-CVAL Evaluation Module User's Guide, which contains a single buck converter capable of supplying 18-A of load current. A key feature of the TPS7H4001-SP is that it supports parallel operation easily allowing four buck converters to operate in quadrature phase and deliver up to 72-A of load current to a tightly regulated line. Parallel operation is demonstrated on the TPS7H4001QEVM-CVAL Evaluation Module User's Guide.
As different applications call for unique load current requirements even within a single system, users may want to evaluate these different applications with the same hardware, avoiding multiple hardware purchases. This document provides instructions on how to do just that; specifically, listing the modifications required on the 4-Channel EVM in order to realize a 3-channel design. Note, this application report is part of a series of reports showing how to convert 4-channel to 1-channel, 4-channel to 2-channel, and 4-channel to 3-channel designs. Please refer to other documents if 1-channel or 2-channel designs are desired.
The following steps must be taken to ensure proper operation of a 3-channel buck converter on a populated 4-channel EVM (TPS7H4001QEVM-CVAL). An overview of where changes are required is shown in Figure 2 while a summary of all changes is provided in Table 1.
Position on PCB | Component Designator | Action |
---|---|---|
MASTER DUT U1 | R13, R20 | DNI |
R7 | Replace with 3.0kohms | |
C14 | Replace with 240pF | |
C15 | Replace with 27nF | |
SLAVE1 DUT U2 | R30 | DNI |
C35, C36, C38, C39, C40, C41, C42, C43 | DNI | |
C52, C53, C54, C55, C56, C57, C58, C60 | DNI | |
U2 pin 2 (EN) | Lift off of PCB | |
U2 pin 31 (SS/TR) | Lift off of PCB | |
U2 pin 33 (COMP) | Lift off of PCB |