Texas Instruments Evaluation Module for TPS5401 0.5A Step-Down SWIFT Converter TPS5401EVM-708 TPS5401EVM-708 Datenbogen
Produktcode
TPS5401EVM-708
R = 10 k
6
W ´
(V
0.8 V)
OUT
0.8 V
-
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Test Setup and Results
1.3
Modifications
These evaluation modules are designed to provide access to the features of the TPS5401. Some
modifications can be made to this module.
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 0.8 V. The value of R
6
for a specific output voltage can
be calculated using
(1)
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 130 ns, and the maximum duty cycle is less than 91%. The values given
in
in
are standard values, not the exact value calculated using
.
Table 3. Output Voltages Available
Output Voltage (V)
R
6
Value (k
Ω
)
1.8
12.4
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 (
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 TPS5401EVM-708 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.
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 TPS5401EVM-708 is provided with input/output connectors and test points as shown in
. A
power supply capable of supplying 0.5 A 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 0.5 A. Wire lengths must be minimized to reduce losses in the wires. Test-point TP1 provides a place
to monitor the V
load must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability must
be 0.5 A. 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. TP9 is used to monitor
the output voltage with TP10 as the ground reference.
3
SLVU430 – January 2011
TPS5401EVM-708 0.5-A, SWIFT™ Regulator Evaluation Module
© 2011, Texas Instruments Incorporated