Texas Instruments TPS40074EVM, User Manual

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4.2 Equipment Setup
Figure 4-2 shows the basic recommended test setup to evaluate the TPS40074EVM-001. Note that although the
return for J1 and J2 are the same, the connections should remain separate as shown in Figure 4-1 .
4.2.1 Procedure
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. An electrostatic smock and safety
glasses should also be worn.
2. Prior to connecting the DC input source, V
12V_IN
, it is advisable to limit the source current from V
12V_IN
to
5.0-A maximum. Make sure V
12V_IN
is initially set to 0 V and connected as shown in Section 4.2.2 .
3. Connect the ammeter A1 (0-A to 5-A range) between V
12V_IN
and J1 as shown in Figure 4-1 .
4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 4-1 .
5. Connect LOAD1 to J2 as shown in Figure 3-1 . Set LOAD1 to constant current mode to sink 0 A
DC
before
V
12V_IN
is applied.
6. Connect voltmeter, V2 across TP17 and TP18 as shown in Figure 4-1 .
7. Connect an oscilloscope probe to TP16 and TP15 as shown in Figure 4-2 .
8. Place a fan as shown in Figure 4-1 . Turn it on, making sure air is flowing across the EVM.
4.2.2 Diagram
LOAD1
1.5V @
15A
-
+
-
+
V1
FAN
-1
V
5
_
O
U
T
+
+12V_IN -
+
-
Oscilloscope
1M!, AC
10mV / div
20MHz
+
+
-
-
A1
V
-
+
12V_IN
TP1
TP2
TP16
TP15
TP5
TP7 TP6
TEXAS INSTRUMENTS
TPS40074EVM-001
12V to 1.5V @ 15A with Remote Sense
HPA095A
J2
J1
V2
+
-
-
+
TP18
TP17
GND CHA CHB
See Tip and Barrel
Measurement for
Vout ripple
Figure 4-1. TPS40074EVM-001 Recommended Test Setup
www.ti.com Test Setup
SLUU231A – JUNE 2006 – REVISED JANUARY 2022
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