Datasheet

www.ti.com
Network
Analyzer
LOAD1
1.8V @
6A
-
+
FAN
Oscilloscope
TP13
TEXASINSTRUMENTS
TPS40041 EVM-001
5Vto 1.8V @ 6A
HPA137
J2
V2
+
-
TP15
TP14
Pre-Bias
See TipandBarrel
Measurementfor
Voutripple
-
+
-
+
V1
+
-
A1
-
+
V
VIN
TP8 TP7 TP6 TP5 TP9 TP10 TP11 TP12TP3
GND SW HDRV LDRV CH1 GND CH2 GNDENABLE
TP2
TP1
Isolation
Transformer
J2
1M , AC
20mA/div
20MHz
W
4.3 Startup/Shutdown Procedure
4.4 Output Ripple Voltage Measurement Procedure
Test Setup
Figure 4. Control Loop Measurement Setup
1. Increase V
IN
(V1) from 0 V to 5 Vdc.
2. Vary LOAD1 from 0 A tp 10 Adc
3. Vary V
IN
from 4.5 Vdc to 5.5 Vdc
4. Short TP21 to TP19 to disable switching and 3-state output.
5. Decrease LOAD1 to 0 A.
6. Decrease V
IN
to 0 Vdc.
1. Increase VIN from 0 V to 5 Vdc.
2. Adjust LOAD1 to desired load between 0 Adc and 10 Adc.
3. Adjust V
IN
to desired load between 4.5 Vdc and 5.5 Vdc.
4. Connect oscilloscope probe to TP15 and TP16 as shown in Figure 3 .
10 Using the TPS40040EVM-001: A 12-V Input, 1.8-V Output, 10-A Synchronous Buck Converter SLUU266 – January 2007
Submit Documentation Feedback