Datasheet

C1: PH (10 V/div)
C2: V
OUT
AC coupled (20 mV/div)
Timebase: 50.0 µs/div
C1: PH (10 V/div)
C2: V
OUT
AC coupled (100 mV/div)
Timebase: 2.00 µs/div
C1: PH (10 V/div)
C2: V
OUT
AC coupled (20 mV/div)
Timebase: 2.00 µs/div
www.ti.com Test Setup and Results
4.5 Output Voltage Ripple
Figure 7 shows the TPS55340EVM-148 output voltage ripple and switching waveform. The output current
is the rated full load of 2.5A and V
IN
= 12V. The ripple voltage is measured directly across C6.
Figure 8 shows the TPS55340EVM-148 output voltage ripple and switching waveform while operating in
discontinuous conduction mode (DCM). The input voltage is 12V and the output is loaded with 20Ω
(250mA).
The TPS55340 features pulse-skipping for output regulation when operating at light loads. Figure 9 shows
the output voltage ripple and the pulse-skipping at SW. The input voltage is 24V and the output has no
load.
Figure 7. Maximum Load Output Voltage Ripple Figure 8. DCM Output Voltage Ripple
Figure 9. Pulse-Skipping Output Voltage Ripple
7
SLVU751A–July 2012–Revised June 2013 TPS55340EVM-148, 8V to 24V Input, 5V Output Flyback Evaluation Module
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