Texas Instruments TPS54290, Руководство пользователя

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4.2 Equipment Setup
Shown in Figure 4-1 is the basic recommended test setup to evaluate the TPS54291EVM-431. Note that
although the return for J1, J2, and JP3 is the same system ground, 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
IN
, it is advisable to limit the source current from V
IN
to 2.0-A
maximum. Make sure V
IN
is initially set to 0 V and connected as shown in Figure 4-1 .
3. Connect the ammeter A1 (0-A to 5-A range) between V
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 4-1 . Set LOAD1 to constant current mode to sink 0 Adc before V
IN
is applied.
6. Connect voltmeter V2 across TP3 and TP4 as shown in Figure 4-1 .
7. Connect LOAD2 to J3 as shown in Figure 4-1 . Set LOAD2 to constant current mode to sink 0 Adc before V
IN
is applied.
8. Connect voltmeter V3 across TP18 and TP19 as shown in Figure 4-1 .
9. Place a fan as shown in Figure 4-2 and turn it on, making sure air is flowing across the EVM.
4.2.2 Diagram
LOAD1
3.3V @
1.5A
-
+
FAN
V2
+
-
See Tip and Barrel
Measurement for
Vout ripple
V1
+
-
A1
-
+
V
VIN
Oscilloscope
1M W , AC
20mV / div
20MHz
LOAD2
1.2V @
2.5A
+
-
V3
- +
Figure 4-1. TPS54291EVM-431 Recommended Test Setup
Test Setup www.ti.com
8 TPS54291 Step-Down Converter Evaluation Module User's Guide SLVU356A – JANUARY 2010 – REVISED OCTOBER 2021
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