Datasheet

R =10k
6
W
´
(V 0.8V)
OUT
0.8V
-
www.ti.com Test Setup and Results
1.3 Modifications
These evaluation modules are designed to provide access to the features of the TPS54061. Some
modifications can be made to this module.
1.3.1 Output Voltage Set Point
To change the output voltage of the EVM, it is necessary to change the value of resistor R
6
. Changing the
value of R
6
can change the output voltage above 0.8V. The value of R
6
for a specific output voltage can
be calculated using Equation 1.
(1)
Table 3 lists the R
6
values for some common output voltages. Note that V
IN
must be in a range so that the
minimum on-time is greater than 120ns. The values given in Table 3 are standard values, not the exact
value calculated using Equation 1.
Table 3. Output Voltages Available
Output Voltage R
6
Value
(V) (kΩ)
1.8 12.7
2.5 21.5
3.3 31.6
5 52.3
Be aware that changing the output voltage can affect the loop response. It may be necessary to modify
the compensation components. See the data sheet for details.
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54061EVM-142 evaluation
module. The section also includes test results typical for the evaluation module and covers efficiency,
output voltage regulation, load transients, loop response, output ripple, input ripple, and start-up.
2.1 Input/Output Connections
The TPS54061EVM-142 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 0.2A must be connected to J1 through a pair of 20 AWG wires. The
load must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability must
be 0.2A. Wire lengths must be minimized to reduce losses in the wires. Test-point TP1 provides a place to
monitor the V
IN
input voltages with TP2 providing a convenient ground reference. TP5 is used to monitor
the output voltage with TP6 as the ground reference.
Table 4. EVM Connectors and Test Points
Reference Designator Function
J1 V
IN
(see Table 1 for V
IN
range).
J2 V
OUT
, 3.3V at 0.2A maximum.
JP1 EN jumper. Connect EN to ground to disable, open to enable.
TP1 V
IN
test point at V
IN
connector.
TP2 GND test point at V
IN
.
TP3 PH test point.
TP4 Test point between voltage divider network and output. Used for loop response measurements.
TP5 Output voltage test point at OUT connector.
TP6 GND test point at OUT connector.
3
SLVU721–May 2012 Evaluation Module for TPS54061 Synchronous Step-Down SWIFT
Submit Documentation Feedback
Copyright © 2012, Texas Instruments Incorporated