Texas Instruments Isolated Flyback Topology Module for TPS55340 TPS55340EVM-148 TPS55340EVM-148 Datenbogen
Produktcode
TPS55340EVM-148
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)
Test Setup and Results
4.8
Turn On and Off with EN
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 5
5V. The load is 5
Ω
(1A).
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 5
Ω
(1A).
Figure 13. Turn On With EN
Figure 14. Turn Off With EN
4.9
Turn On and Off with V
IN
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 5
Ω
(1A).
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 5
Ω
(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
Copyright © 2012–2013, Texas Instruments Incorporated