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AN4501 Datasheet(PDF) 45 Page - STMicroelectronics

Part # AN4501
Description  Design of a boost LED driver using L99LD01
PDF  48 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4501 Datasheet(HTML) 45 Page - STMicroelectronics

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AN4501
Calculation details
47
iL = iD and (iM1 = 0) for DT < t < T
By definition,
Using Equation 30 and Equation 31, we have:
Equation 32:
Equation 33:
or
Equation 34:
I
L,RMS
2
1
T
---
i
L
2
t
d
0
T
1
T
---
i
M1
2
t
d
0
T
1
T
---
i
D
2
t
d
0
T
+
I
M1,RMS
2
I
D,RMS
2
+
==
=
I
D,RMS
2
I
L
2
I
L,PP
2
12
----------------
+
=
I
L,RMS
I
L
2
I
L,PP
2
12
----------------
+
I
OUT
2
1D
–
()
2
---------------------
I
L,PP
2
12
----------------
+
==
I
L,RMS
I
OU T
1D
–
------------- 1
1
12
------
I
L,PP
I
L
------------


 2
+
=



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