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AN4501 bảng dữ liệu(PDF) 13 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Design of a boost LED driver using L99LD01
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AN4501 bảng dữ liệu(HTML) 13 Page - STMicroelectronics

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AN4501
Guideline for the selection of external components
47
Table 2. Results of the iterative calculation of the worst case junction temperature
Iteration
TJ1
[°C]
RON,M1@TJ1
[m
Ω]
PM1,COND@TJ1
[W]
PM1@TJ1
[W]
TJ2
[°C]
RON,M1@TJ1
[m
Ω]
DiffRon
[m
Ω]
1
85
21.8
0.403
1.53
123
25.4
3.67
2
123
25.4
0.471
1.60
125
25.6
0.16
Table 3. Formula for currents and voltages of power components
Parameter
Value
Worst case VIN
(corresponding
to the max
parameter value)
Comment
D
VIN,MIN
Duty cycle
η represents the
efficiency of the boost converter
IL
VIN,MIN
Inductor average current
IL,PP
VIN,50
Inductor peak-to-peak current ripple
IL,PEAK
VIN,MIN
(in general)
Inductor peak current. The worst
case VIN must be verified case by
case
IL,RMS
VIN,MIN
(in general)
The worst case VIN must be verified
case by case as the second term is
not a monotonic increasing function
ID
—
Diode average current
ID,PEAK
VIN,MIN
(in general)
Diode peak current. The worst case
VIN must be verified case by case
VOUT,PP
VIN,MIN
Output peak-to-peak voltage ripple
ESRCOUT is neglected
IOUT,PP
VIN,MIN
Boost output and LED peak-to-peak
current ripple
VCIN,PP
VIN,50
Input peak-to-peak current ripple
ESRCIN is neglected
IM1,RMS
VIN,MIN
(in general)
MOSFET RMS current
1
V
IN
η
×
V
OUT
-------------------
–
I
L
I
OUT
1D
–
-------------
=
V
OUT
D
×
1D
–
()
×
LF
SW
×η
×
---------------------------------------------------
I
OUT
1D
–
-------------
V
OUT
D
×
1D
–
()
×
2L
×
F
SW
×η
×
---------------------------------------------------
+
I
OUT
2
1D
–
()
2
---------------------
I
LPP
,
2
12
-----------------
+
I
OUT
I
OUT
1D
–
-------------
V
OUT
D
×
1D
–
()
×
2L
×
F
SW
×η
×
---------------------------------------------------
+
I
OUT
D
×
C
OUT
F
SW
×
----------------------------------
I
OUT
D
×
Nb
LED
R
DLED
×
C
×
OUT
F
SW
×
------------------------------------------------------------------------------------
I
LPP
,
8F
×
SW
C
IN
×
--------------------------------------
I
M1,RMS
I
OUT
1D
–
------------- D1
1
12
------
I
LPP
,
I
L
--------------


 2
+



×
=



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