Datasheet

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5 Test Set Up
5.1 Recommended Test 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 Set Up
The input voltage source V
IN1
should be a 0–15 V variable DC source capable of 10 A. Connect V
IN1
to J1
as shown in Figure 2 .
The input voltage source V
IN2
should be a 0–6 V variable DC source capable of 2 A. Connect V
IN2
to J2 as
shown in Figure 2 .
V1: V
IN
0–15 V voltmeter
V2: V
OUT
0–5 V voltmeter
I1: I
IN
, 0–10 A current meter
The output load (LOAD) should be an electronic constant current mode load capable of 0–40 A DC at 1.5
V.
A digital or analog oscilloscope can be used to measure the ripple voltage on V
OUT
. The oscilloscope
should be set for 1 M Ω impedance, 20MHz Bandwidth, AC coupling, 1 µ s/division horizontal resolution,
20mV/division vertical resolution for taking output ripple measurements. Test points TP7 and TP8 can be
used to measure the output ripple voltage by placing the oscilloscope probe tip through TP7 and holding
the ground barrel TP8 as shown in Figure 3 . Using a leaded ground connection may induce additional
noise due to the large ground loop area.
VIN1 to J1 (12V input)
The connection between the source voltage, VIN1 and J1 of the EVM can carry as much as 10 Amps DC.
The recommended wire size is 1x AWG #16 per input connection, with the total length of wire less than 4
feet (2 feet input, 2 feet return).
VIN2 to J2 (5V auxiliary input)
The connection between the source voltage, VIN2 and J2 of the EVM can carry as much as 1 Amps DC.
The recommended wire size is 1x AWG #22 per input connection, with the total length of wire less than 4
feet (2 feet input, 2 feet return).
J4,J5 to LOAD (Power)
The power connection between J4, J5 of the EVM and LOAD can carry as much as 40-A DC. The
minimum recommended wire size is 2x AWG #16, with the total length of wire less than 4 feet (2 feet
output, 2 feet 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 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 while the fan is not running.
SLVU198A – February 2007 – Revised May 2007 Using the TPS40131EVM, A 40A Single Output 5
Two-Phase Synchronous Buck Converter
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