Texas Instruments TPS54226 SWIFT Regulator Evaluation Module TPS54226EVM-539 TPS54226EVM-539 Scheda Tecnica
Codici prodotto
TPS54226EVM-539
O
R1
V
= 0.765
1+
R2
æ
ö
´ ç
÷
è
ø
O
O
R1
V
= (0.763 + 0.0017
V
)
1+
R2
æ
ö
´
´ ç
÷
è
ø
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Test Setup and Results
1.3
Modifications
These evaluation modules are designed to provide access to the feature of the TPS54226. Some
modification can be made to this module.
modification can be made to this module.
1.3.1
Output Voltage Set Point
To change the output voltage of the EVMs, it is necessary to change the value of resistor R1. Changing
the value of R1 can change the output voltage above 0.765V. The value of R1 for a specific output voltage
can be calculated using
the value of R1 can change the output voltage above 0.765V. The value of R1 for a specific output voltage
can be calculated using
and
.
For output voltage from 0.76V to 2.5V:
(1)
For output voltage over 2.5V:
(2)
lists the R1 value for some common output voltages. For higher output voltages, a feed forward
capacitor is required. Pads for this component (C2) are provided on the printed circuit board. C2 is used
for faster load transient response and is recommended for auto skip mode stability. Note that the values
given in
for faster load transient response and is recommended for auto skip mode stability. Note that the values
given in
are standard values, and not the exact value calculated using
.
Table 3. Output Voltages
Output Voltage
R1
R2
C2
L1
(V)
(k
Ω
)
(k
Ω
)
(pF)
(µH)
1.0
6.81
22.1
2.2
1.05
8.25
22.1
2.2
1.2
12.7
22.1
2.2
1.8
30.1
22.1
150-220
3.3
2.5
49.9
22.1
68-100
3.3
3.3
73.2
22.1
47 - 68
3.3
5.0
121
22.1
33 - 47
4.7
2
Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54226EVM-539. The section also
includes test results typical for the evaluation modules and efficiency, output load regulation, output line
regulation, load transient response, output voltage ripple, input voltage ripple, start up and switching
frequency.
includes test results typical for the evaluation modules and efficiency, output load regulation, output line
regulation, load transient response, output voltage ripple, input voltage ripple, start up and switching
frequency.
2.1
Input / Output Connections
The TPS54226EVM-539 is provided with input/output connectors and test points as shown in
. A
power supply capable of supplying 2 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 is 2 A.
Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor
the V
must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability is 2 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. TP8 is used to monitor the output
voltage with TP9 as the ground reference.
3
SLVU336 – November 2009
TPS54226EVM-539 2-A, SWIFT
TM
Regulator Evaluation Module
Copyright © 2009, Texas Instruments Incorporated