Texas Instruments TPS54291EVM-431, User Manual, Page: 8 / 18

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
- +
Test Set UP
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maximum. Make sure V
IN
is initially set to 0V and connected as shown in Figure 2 .
3. Connect the ammeter A1 (0-5A range) between V
IN
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 0Adc before
V
IN
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 0Adc before
V
IN
is applied.
8. Connect voltmeter, V3 across TP18 and TP19 as shown in Figure 2 .
9. Place Fan as shown in Figure 3 and turn on, making sure air is flowing across the EVM.
4.2.2 Diagram
Figure 2. TPS54291EVM-431 Recommended Test Set-Up
8 Using the TPS54291EVM-431 A 12V Input, 3.3V 1.5A and 1.2V 2.5A SLVU356 – January 2010
Synchronous Buck Converter
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