Texas Instruments TPS5124EVM-001, Руководство пользователя, Страница: 15 / 23

SLUU182 − March 2004
15 High-Performance Dual Synchronous Buck Conversion Using the TPS5124
0 0.2 0.4 0.6 0.8 1.0
90
88
96
94
86
92
Output Power Over the Full Power
Percent Efficiency − %
OVERALL EFFICIENCY
vs
OUTPUT POWER
Both Channels Enabled
Figure 8.
VIN = 6.5 V
VIN = 12 V
VIN = 15 V
5.2 Typical Operating Waveform
Typical operating waveforms taken at V
IN
=12 V, I
OUT1
= 15 A and I
OUT2
=10 A is shown in
Figure 9.
5.3 Start-Up Waveform
Figure 10 shows the start-up waveform taken at V
IN
=12 V, I
OUT1
= 15 A and I
OUT2
=10 A. The
rising time is 2.85 ms for V
OUT1
and 2.12ms for V
OUT2
.
Figure 9. Switch Node Waveform
t − Time − 2
µ
s/div
Figure 10. Start−Up Waveform
VOUT1
SS
VOUT2
t − Time − 10 ms/div