Texas Instruments 9A, 3V to 4V Vin, SWIFT™ Converter Evaluation Module TPS54917EVM-367 TPS54917EVM-367 Datenbogen
Produktcode
TPS54917EVM-367
2.9
Powering Up
V
OUT
V
IN
SS/ENA
V
OUT
1 V/div
500 mV/div
2.10 Thermal Characteristics
Test Setup and Results
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The start-up waveforms are shown in
and
. In
, the top trace shows V
IN
, and the
bottom trace shows V
OUT
. In
, the top trace shows EN (enable) whereas the bottom trace shows
V
OUT
. In
, the input voltage is initially applied and the output is inhibited by using a jumper at J2 to
tie EN to GND. When the jumper is removed, EN is released. When the EN voltage reaches the
enable-threshold voltage of 1.25 V, the start-up sequence begins and the internal reference voltage begins
to ramp up at the internally set rate toward 0.8 V and the output voltage ramps up to the externally set
value of 3.3 V. The input voltage for these plots is 15 V and there is no load.
enable-threshold voltage of 1.25 V, the start-up sequence begins and the internal reference voltage begins
to ramp up at the internally set rate toward 0.8 V and the output voltage ramps up to the externally set
value of 3.3 V. The input voltage for these plots is 15 V and there is no load.
Figure 8. TPS54917EVM-367 Start-Up Relative to V
IN
Figure 9. TPS54917EVM-367 Start-up Relative to Enable
This section shows a thermal image of the TPS54917EVM-367 running at 3.3 V input and 9 A load. These
are the worst case conditions for maximum power loss. There is no air flow and the ambient temperature
is 25
are the worst case conditions for maximum power loss. There is no air flow and the ambient temperature
is 25
°
C. The peak temperature of the IC (85.8
°
C) is well below the maximum recommended operating
condition listed in the datasheet of 150
°
C.
8
TPS54917EVM-367 9-A, SWIFT™ Regulator Evaluation Module
SLVU278 – December 2008