Datasheet
Table Of Contents
- 1 Introduction
- 2 TPS54386EVM Electrical Performance Specifications
- 3 Schematic
- 3.1 Sequencing Jump (JP3)
- 3.2 Enable Jumpers (JP1 and JP2)
- 3.3 Test Point Descriptions
- 3.3.1 Input Voltage Monitoring (TP1 and TP2)
- 3.3.2 Channel 1 Output Voltage Monitoring (TP3 and TP4)
- 3.3.3 Channel 1 Loop Analysis (TP5, TP6, TP7 and TP8)
- 3.3.4 Channel 1 Switching Waveforms (TP9 and TP10)
- 3.3.5 TPS54386 Device Ground (TP11)
- 3.3.6 Channel 2 Switching Waveforms (TP12 and TP13)
- 3.3.7 Channel 2 Loop Analysis (TP14, TP15, TP16 and TP17)
- 3.3.8 Output Voltage Monitoring (TP18 and TP19)
- 4 4 Test Set Up
- 5 TPS54386EVM Typical Performance Data and Characteristic Curves
- 6 EVM Assembly Drawings and Layout
- 7 List of Materials
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4.2 Equipment Setup
4.2.1 Procedure
4.2.2 Diagram
FAN
LOAD1
5.0V @
2A
-
+
V2
-
+
See Tip and Barrel
Measurement for Vout
ripple
Oscilloscope
1MW, AC
20mV / div
20MHz
LOAD2
3.3V @
2A
+
-
V3
-
+
V1
+
-
A1
-
+
V
VIN
4 Test Set Up
Shown in Figure 2 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 2
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 2 .
3. Connect the ammeter A1 (0-5 A range) between VIN and J1 as shown in Figure 2 .
4. Connect voltmeter V1 to TP1 and TP2 as shown in Figure 2 .
5. Connect LOAD1 to J2 as shown in Figure 2 . 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 2 .
7. Connect LOAD2 to J3 as shown in Figure 2 . 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 2 .
9. Place fan as shown in Figure 2 and turn on, making sure air is flowing across the EVM.
Figure 2. TPS54386EVM Recommended Test Set-Up
SLUU286 – March 2008 A 12-V Input, 5.0-V and 3.3-V Output, 2-A Non-Synchronous Buck Converter 9
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