Datasheet
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5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
5.1.2 Meters
5.1.3 Loads
5.1.4 Oscilloscope
5.1.5 Recommended Wire Gauge
5.1.6 Other
Test Setup
V
IN
: The input voltage source (V
IN
) should be a 0V–15V variable dc source capable of 5A
DC
. Connect V
IN
to J1 as shown in Figure 2 .
A1: 0A
DC
–5A
DC
, ammeter
V1: V
IN
, 0V–15V voltmeter
V2: V
OUT
0V–5V voltmeter
LOAD1: The output load (LOAD1) should be an electronic constant current mode load capable of
0A
DC
–10A
DC
at 1.8V.
Oscilloscope: A digital or analog oscilloscope can be used to measure the ripple voltage on V
OUT
. The
oscilloscope should be set for 1M Ω impedance, 20MHz bandwidth, ac coupling, 1 µ s/division horizontal
resolution, and 10mV/division vertical resolution for taking output ripple measurements. TP15 and TP16
can be used to measure the output ripple voltage by placing the oscilloscope probe tip through TP15 and
holding the ground barrel to TP16, as shown in Figure 3 . For a hands-free approach, the loop in TP16 can
be cut and opened to cradle the probe barrel. Using a leaded ground connection may induce additional
noise because of the large ground loop area.
V
IN
to J1: The connection between the source voltage, V
IN
, and J1 of HPA238 can carry as much as
5A
DC
. The minimum recommended wire size is AWG #16 with the total length of wire less than four feet
(two feet input, two feet return max recommended).
J2 to LOAD1 (Power): The power connection between J2 of HPA238 and LOAD1 can carry as much as
10A
DC
. The minimum recommended wire size is 2x AWG #16, with the total length of wire less than two
feet (one foot output, one foot return max recommended).
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 200lfm–400lfm is required to
reduce component surface temperatures to prevent user injury.
CAUTION
The EVM should not be left unattended while powered.
WARNING
The EVM should not be probed while the fan is not running.
Using the TPS40193EVM-001 8 SLUU274 – May 2007
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