Datasheet
LOAD1
3.3V @
1.5A
-
+
FAN
V2
+
-
See TipandBarrel
Measurementfor
Voutripple
V1
+
-
A1
-
+
V
VIN
Oscilloscope
1MW, 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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