Texas Instruments 2.5A, 10.8 to 13.2 Vin, SWIFT™ Converter Evaluation Module TPS54260EVM-597 TPS54260EVM-597 데이터 시트
제품 코드
TPS54260EVM-597
R = 10 k
6
W ´
(V
0.8 V)
OUT
0.8 V
-
www.ti.com
Test Setup and Results
Table 2. TPS54260EVM-597 Performance Specification Summary (continued)
SPECIFICATION
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Operating frequency
300
kHz
Maximum efficiency
TPS54260EVM-597, V
IN
= 12 V, I
O
= 0.8 A
87.1%
CCM/DCM boundary
V
IN
= 12 V,
0.337
A
Eco-mode™ threshold
V
IN
= 12 V
5
mA
No load input current (switching)
V
IN
= 12 V
392
µA
1.3
Modifications
These evaluation modules are designed to provide access to the features of the TPS54260. Some
modifications can be made to this module.
modifications can be made to this module.
1.3.1
Output Voltage Set Point
The voltage divider of R
6
and R
7
is used to set the output voltage of the EVM. The 51
Ω
resistor R
5
is
provided as an aid to check the loop response of the circuit. To change the output voltage of the EVM, it is
necessary to change the value of resistor R
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 94%. Higher duty
cycles are possible, but may result in uneven switching behavior. The values given in
cycles are possible, but may result in uneven switching behavior. The values given in
are
standard values, not the exact value calculated using
.
Table 3. Output Voltages Available
Output Voltage
R
6
Value
(V)
(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 datasheet for details.
the compensation components. See the datasheet for details.
1.3.2
Operating Frequency, Slow-Start and UVLO
The operating frequency, slow-start time and UVLO voltage may also be adjusted. R3 sets the operating
frequency, C4 sets the slow-start time and the resistor divider of R1 and R2 sets the UVLO start and stop
voltages. See the TPS54260 datasheet for details on adjusting these parameters.
frequency, C4 sets the slow-start time and the resistor divider of R1 and R2 sets the UVLO start and stop
voltages. See the TPS54260 datasheet for details on adjusting these parameters.
2
Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54260EVM-597 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.
3
SLVU372 – March 2009
TPS54260EVM-597 2.5-A, SWIFT™ Regulator Evaluation Module
Copyright © 2009, Texas Instruments Incorporated