Datasheet

4.1.6 Other
4.2 Equipment Setup
4.2.1 Procedure
Test Set UP www.ti.com
The power connection between J2 of HPA241 and LOAD1 can carry as much as 2Adc. The minimum
recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot
return).
J3 to LOAD2
The power connection between J3 of HPA241 and LOAD2 can carry as much as 2Adc. The minimum
recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot
return).
FAN
This evaluation module includes components that can get hot to the touch, because this EVM is not
enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is recommended to reduce
component surface temperatures to prevent user injury. The EVM should not be left unattended while
powered. The EVM should not be probed while the fan is not running.
Shown in Figure 2 is the basic test set up recommended to evaluate the TPS55386EVM-363. Note that
although the return for J1, J2 and JP3 are the same system ground, the connections should remain
separate as shown in Figure 2 .
1. Working at an ESD workstation, make sure that any wrist straps, bootstraps or mats are connected
referencing the user to earth ground before power is applied to the EVM. Electrostatic smock and
safety glasses should also be worn.
2. Prior to connecting the DC input source, V
IN
, it is advisable to limit the source current from V
IN
to 5.0A
maximum. Make sure V
IN
is initially set to 0V and connected as shown in Figure 2 .
3. Connect the ammeter A1 (0-5A 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 0Adc before
V
IN
is applied.
6. Connect voltmeter, V2 across TP3 and TP4 as shown in Figure 2 .
7. Connect LOAD2 to J3 as shown in Figure 2 . Set LOAD2 to constant current mode to sink 0Adc before
V
IN
is applied.
8. Connect voltmeter, V3 across TP18 and TP19 as shown in Figure 2 .
9. Place Fan as shown in Figure 3 and turn on, making sure air is flowing across the EVM.
Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter8 SLVU273 – September 2008
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