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LM5155 Datasheet(PDF) 29 Page - Texas Instruments

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Part # LM5155
Description  LM5155x-Q1 2.2-MHz Wide Input Nonsynchronous Boost, SEPIC, Flyback Controller
PDF  51 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LM5155 Datasheet(HTML) 29 Page - Texas Instruments

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PL is the sum of DCR loss (PDCR) and AC core loss (PAC). DCR is the DC resistance of inductor which is
mentioned in the inductor data sheet.
L
DCR
AC
P
P
P
(29)
Each power loss is approximately calculated as follows:
2
DCR
SUPPLY
DCR
P
I
R
u
(30)
AC
SW
P
K
I
f
E
D
u ' u
(31)
SUPPLY
SW
M
1
V
D
f
I
L
u u
'
(32)
∆I is the peak-to-peak inductor current ripple. K, α, and β are core dependent factors which can be provided by
the inductor manufacturer.
PRS is calculated as follows:
2
RS
SUPPLY
S
P
D
I
R
u
u
(33)
Efficiency of the power converter can be estimated as follows:
LOAD
LOAD
TOTAL
LOAD
LOAD
V
I
Efficiency
P
V
I
u
u
(34)
10.2.3 Application Curve
ILOAD [A]
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
76
78
80
82
84
86
88
90
92
94
96
98
BSTE
BSTE
BSTE
VSUPPLY=18V
VSUPPLY=12V
VSUPPLY=9V
VSUPPLY=6V
Figure 10-2. Efficiency
www.ti.com
LM5155-Q1, LM51551-Q1
SNVSAY4E – AUGUST 2018 – REVISED JANUARY 2021
Copyright © 2021 Texas Instruments Incorporated
Submit Document Feedback
29
Product Folder Links: LM5155-Q1 LM51551-Q1



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