TPS55340-Q1_16 Datasheet, PDF (27/37 Pages) Texas Instruments – Integrated 5-A, Wide Input Range Boost, SEPIC, or Flyback DC-DC Converter

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8.2.2.3 Application Curves
The following curves are characteristics of the SEPIC converter.
TPS55340-Q1
SLVSBV5A – JUNE 2014 – REVISED JULY 2016
100
95
90
85
80
75
70
65
VVI _I==66VV
60
VVI _I==1122VV
55
VVI I==1188VV
50
0.0
0.2
0.4
0.6
0.8
1.0
1.2
Output Current (A)
C019
I_O
V_O
I_O = 500 mA/div
Time — 500 µs/div
V_O (AC-coupled) = 200 mV/div
Figure 28. Efficiency Versus Output Current
SW
I_L(b)
I_L(a)
Figure 29. Load Transient Response
V_I
EN
SW
V_O
Time — 2 µs/div
V_(SW) = 10 V/div
I_L(b) = 1 A/div
V_O (AC-coupled) = 50 mV/div
I_L(a) = 1 A/div
V_O
V_I = 2 V/div
V_O = 5 V/dvi
Time — 1 ms/div
V_(EN) = 2 V/div
V_(SW) = 20 V/div
Figure 30. CCM PWM Operation
60
40
20
Figure 31. Output Voltage Soft-start
180
6-V Gain
6-V Phase
18-V Gain ¹²⁰
18-V Phase
60
0
0
-20
-60
-40
-120
-60
-180
100
1000
10000
100000
Frequency (Hz)
D004
Figure 32. Closed Loop Gain and Phase of the SEPIC Converter
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