Datasheet

C1: V
IN
(5.00 V/div)
Timebase: 5.00 ms/div
C4: V
OUT
(2.00 V/div)
C1: V
IN
(5.00 V/div)
C2: COMP (500 mV/div)
Timebase: 5.00 ms/div
C3: V
C18
(2.00 V/div)
C4: V
OUT
(2.00 V/div)
C1: EN (5.00 V/div)
Timebase: 5.00 ms/div
C4: V
OUT
(2.00 V/div)
C1: EN (5.00 V/div)
C2: COMP (500 mV/div)
Timebase: 5.00 ms/div
C3: V
C18
(2.00 V/div)
C4: V
OUT
(2.00 V/div)
www.ti.com Test Setup and Results
4.8 Turn On and Off with EN
Figure 13 shows the start-up waveforms for the TPS55340EVM-148. The input voltage is 12V, the EN
goes high, the COMP voltage rises, the device begins switching and the output voltage ramps from 0V to
5V. The load is 5Ω (1A).
Figure 14 shows the shutdown waveforms for the TPS55340EVM-148. The input voltage is 12V, the EN
goes low and the output voltage ramps from 5V to 0V. The load is 5Ω (1A).
Figure 13. Turn On With EN Figure 14. Turn Off With EN
4.9 Turn On and Off with V
IN
Figure 15 shows the start-up waveforms for the TPS55340EVM-148. The input voltage ramps with the
input voltage power supply and EN is tied to V
IN
. V
IN
ramps up, the COMP voltage rises, the converter
starts switching and the output voltage ramps to 5V. The load is 5Ω (1A).
Figure 16 shows the shutdown waveforms for the TPS55340EVM-148. The input voltage ramps down with
the input voltage power supply and EN is tied to V
IN
. When V
IN
is less than the 2.5V typical UVLO, the
converter stops switching and the output voltage ramps down. The load is 5Ω (1A).
Figure 15. Turn On With V
IN
Figure 16. Turn Off With V
IN
9
SLVU751A–July 2012–Revised June 2013 TPS55340EVM-148, 8V to 24V Input, 5V Output Flyback Evaluation Module
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