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AN4501 数据表(PDF) 9 Page - STMicroelectronics

部件名 AN4501
功能描述  Design of a boost LED driver using L99LD01
PDF  48 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN4501 数据表(HTML) 9 Page - STMicroelectronics

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AN4501
Guideline for the selection of external components
47
The maximal duty cycle of the L99LD01 is respected as well (datasheet parameter: Duty
Cycle, 88% minimum specification).
Step 2: Selection of the inductor
Required inductance value:
The maximum inductor DC current is given by:
According to the definition of the inductor current ripple rMAX, we have:
The minimum inductance value is given by:
An inductance of 6.8µH can be selected, considering a tolerance of +/- 20%.
Inductor maximum peak and RMS current
D
MAX
1
V
IN MIN
η
×
V
OU T
------------------------------
–
1
60.9
×
26
-----------------
–
79.1%
==
=
I
L,M AX
I
OUT
1D
–
MAX
-------------------------
1.0
1
0.791
–
------------------------
4.81A
==
=
I
L,PP@VINMIN,TARGET
r
MAX
I
L,MAX
×
0.5
4.81
×
2.41A
==
=
L
MIN
V
OU T
D
MAX
1D
MAX
–
()
×
×
F
SW
I
L,PP@VINMIN,TARGET
η
×
×
--------------------------------------------------------------------------------------
26
0.791
×
10.791
–
()
×
450 10
⋅
3
2.41
0.9
×
×
---------------------------------------------------------------
4.4µH
∼
==
I
L,PEAK,MAX
I
OUT
1D
MAX
–
-------------------------
V
OUT
D
MAX
1D
MAX
–
()
×
×
2F
SW
L
×η
×
×
--------------------------------------------------------------------------
+
=
I
L,PEAK,MAX
1
10.791
–
------------------------
26
0.791
1
0.791
–
()
×
×
26.8 10
6
–
⋅
450 10
⋅
3
×
0.9
×
×
--------------------------------------------------------------------------------
+
5.59A
==



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