Texas Instruments TPS54386EVM, Руководство пользователя, Страница: 8 / 23

4.2 Equipment Setup
Shown in Figure 4-1 is the basic test set up recommended to evaluate the TPS54386EVM. Please note that
although the return for J1, J2 and JP3 are 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. Electrostatic smock and safety
glasses should also be worn.
2. Prior to connecting the dc input source, VIN, it is advisable to limit the source current from VIN to 5.0 A
maximum. Make sure VIN is initially set to 0 V and connected as shown in Figure 4-1 .
3. Connect the ammeter A1 (0-5 A range) between VIN 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 A
DC
before
VIN 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 A
DC
before
VIN is applied.
8. Connect voltmeter, V3 across TP18 and TP19 as shown in Figure 4-1 .
9. Place fan as shown in Figure 4-1 and turn on, making sure air is flowing across the EVM.
4.2.2 Diagram
FAN
LOAD1
5.0V @
2A
-
+
V2
-
+
See Tip and Barrel
Measurement for Vout
ripple
Oscilloscope
1M
W
, AC
20mV / div
20MHz
LOAD2
3.3V @
2A
+
-
V3
-
+
V1
+
-
A1
-
+
V
VIN
Figure 4-1. TPS54386EVM Recommended Test Set-Up
4 Test Set Up www.ti.com
8 TPS54x86 Step-Down Converter Evaluation Module User's Guide SLUU286A – MARCH 2008 – REVISED OCTOBER 2021
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