Datasheet
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TP10TP9
MetalGroundBarrel
Probe Tip
TipandBarrelVoutRipple
Measurement
3.3.1.5 Recommended Wire Gauge
3.4 Equipment Setup
3.4.1 Procedure
Schematic
Figure 2. Output Ripple Measurement – Tip and Barrel Using TP9 and TP10
V
12V_IN
to J1
The connection between the source voltage, V
12V_IN
and J1 can carry as much as 3 A DC. The minimum
recommended wire size is AWG #16 with the total length of wire less than 4 feet (2 feet input, 2 feet
return).
J2 to LOAD1 (Power)
The power connection between J2 and LOAD1 can carry as much as 15 A DC. The minimum
recommended wire size is 2 × AWG #16, with the total length of wire less than 4 feet (2 feet output, 2 feet
return).
Shown in Figure 3 is the basic test set up recommended to evaluate the TPS40077EVM-001. Note that
although the return for J1 and J2 are the same, 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, V
12V_IN
, it is advisable to limit the source current from V
12V_IN
to 5.0 A maximum. Make sure V
12V_IN
is initially set to 0 V and connected as shown in Figure 3 .
3. Connect an Ammeter A1 as shown in Figure 3 .
4. Connect Voltmeter V1 to TP1 and TP2 as shown in Figure 3 .
5. Connect LOAD1 to J2 as shown in Figure 3 . Set LOAD1 to constant current mode to sink 0 A DC
before V
12V_IN
is applied.
6. Connect Voltmeter V2 to Output J2 as shown in Figure 3 .
7. Connect Oscilloscope probe to TP9 and TP10 as shown in Figure 2 .
6 Using the TPS40077EVM-001 12-V Input, 1.8-V Output, SLVU192A – February 2007 – Revised March 2008
10-A Synchronous Buck Converter
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