Texas Instruments LM5161, Руководство пользователя, Страница: 8 / 19

Load Current (A)
Eff
icie
n
cy (%)
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
75
80
85
90
95
100
Ext-V
CC
Int-V
CC
FPWM = 1
VIN = 24 V
VIN = 48 V
VIN = 60 V
Load Current (A)
Eff
icie
n
cy (%)
0.04 0.07 0.1 0.2 0.3 0.4 0.5 0.7 1
40
50
60
70
80
90
100
FPWM = 1
FPWM = 0
VIN = 24 V
VIN = 48 V
VIN = 60 V
Typical Performance Curves
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8 SNVU504A – August 2016 – Revised August 2016
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LM5161 Buck EVM User’s Guide
V
OUT
= 12 V FPWM = 1 F
SW
= 300kHz
Figure 4. Efficiency vs. I
OUT
V
OUT
- V
CC
diode
connected
F
SW
= 300kHz V
OUT
= 12 V
Figure 5. Efficiency Comparison Between Forced CCM and
DCM
V
IN
= 48 V F
SW
= 300kHz FPWM = 1 V
OUT
- V
CC
diode
connected
Figure 6. Startup at Full Load
Figure 7. Steady State at V
IN
= 48 V and FPWM = 0
(no load)
Figure 8. Steady State at V
IN
= 48 V and FPWM = 1
(no load)
V
IN
= 48 V F
SW
= 300kHz FPWM = 1 V
OUT
- V
CC
diode
connected
Figure 9. EN/UVLO Startup/Shutdown at Full Load