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4.1.5 Recommended Wire Gauge
4.1.6 Other
4.2 Equipment Setup
4.2.1 Procedure
Test Setup
V
IN
to J1
The connection between the source voltage, V
IN
and J1 of TPS40040EVM-001 can carry as much as 5
Adc. The minimum recommended wire size is AWG #16 with the total length of wire less than 4 feet (2
feet input, 2 feet return).
J2 to LOAD1 (Power)
The power connection between J2 of TPS40040EVM-001 and LOAD1 can carry as much as 10 Adc. The
minimum recommended wire size is 2 × AWG #16, with the total length of wire less than 2 feet (1 feet
output, 1 feet return).
FAN
This evaluation module includes components that can become hot to the touch. Because this EVM is not
enclosed to allow probing of circuit nodes, a small fan capable of between 200–400 LFM is required to
reduce component surface temperatures to prevent user injury. The EVM should not be left unattended
while powered. The EVM should not be probed if the fan is not running.
Shown in Figure 3 is the basic test setup recommended to evaluate the TPS40040EVM-001. Note that
although the return for J1 and J2 are the same, the connections should remain separate as shown in
Figure 2 .
1. While working at an ESD workstation, the user should ensure that any wrist straps, bootstraps, or mats
are connected referencing the user to earth ground before applying power to the EVM. Electrostatic
smock and safety glasses also should be worn.
2. Prior to connecting the dc input source, V
IN
, it is advisable to limit the source current from V
IN
to 5 A
maximum. Ensure that V
IN
is initially set to 0 V and connected as shown in Figure 2 .
3. Connect the ammeter A1 (0-A to 5-A range) between V
IN
and J1 as shown in Figure 2 .
4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 2 .
5. Connect LOAD1 to J2 as shown in Figure 2 . Set LOAD1 to constant current mode to sink 0 Adc before
V
IN
is applied.
6. Connect voltmeter, V2 across TP14 and TP15 as shown inFigure 2 .
7. Place fan as shown in Figure 2 . and turn on, ensuring that air is flowing across the EVM.
Using the TPS40040EVM-001: A 12-V Input, 1.8-V Output, 10-A Synchronous Buck Converter8 SLUU266 – January 2007
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